Method of conservation, completion and repair of well

FIELD: oils and gas production.

SUBSTANCE: group of inventions refers to methods and facilities for conservation, completion and repair of wells. The inventions facilitate control over the well during the said operations by means of assembling system of two partitions in well. Each of the partitions is located below the lower end of a flow string for well completion, when this string is installed into the well. As none of these partitions is installed higher in the borehole of the well, so both partitions rest in place during operations of conservation, completion and repair, which eliminates necessity to use a block of blowout preventers to facilitate reliable control over the well.

EFFECT: reduced cost of well construction due to reduced time required for operation of drilling rig.

44 cl, 23 dwg

 

The technical field to which the invention relates

The present invention relates to a method of preservation, completion and repair of wells, in particular to a method of preservation, completion and repair of the well using at least two deep-set partitions. The present invention relates also to the suspended or completed wells equipped with at least two deep-set partitions. The methods of the present invention is applicable to any type of wells, including subsea wells, a well with a surface wellhead and ground well. In particular, the present invention relates to wells used for oil and/or gas, and water injection and/or gas-injection wells.

The level of technology

To ensure proper well control and to meet the current security requirements prescribed by national legislation in many countries, the majority of companies adheres to the principle of guaranteed availability on site at all times during construction or preservation of the wells of at least two independent tested barriers. The term "partition" when used in the text of this application means fizicheskaia, through which you can create a shutter to prevent the uncontrolled release of fluid flow from the side walls under pressure. Operations on well construction encompasses all of the activities, since the drilling of the well to its full completion and readiness for installation of the control device of the well production rate. The most widely used devices for the adjustment of the operational flow rate is usually called the fountain fixture.

When during the construction of wells in the well bore establish at least two partitions, after checking the installation of the borehole can be considered "conserved". Well you cannot conserve or liquidate without the assurance that required at least two independent tested partitions are in place.

Periodically during the life of the well is required to carry out repair work, such as commissioning and maintenance. Repair work involving interference in functioning well in this application is referred to as a "repair"operation. If necessary to carry out the repair operation, usually also follow established security requirements prescribed by national legislation m ogic countries of the world, which require guaranteed availability on site of at least two independent tested partitions during the whole time of repair operations.

Often build several wells that are included in any one oil and/or gas reservoir or the reservoir. Depending on the geological conditions of the Deposit, as well as considerations of priority of service, typically one or more wells must at some period of time to temporarily preserved. These conserved wells may be subsequently returned to action and finished as operational or overcontouring well. Some of the fields in each of the wells sequentially Buryats and finish. In other fields of operation for the construction of wells can be produced simultaneously. In concurrent work flow processes well construction are carried out in separate stages. For example, the first sequence of steps is performed on multiple wells, then these wells perform the second sequence of stages. This process is repeated until such time as each of the wells is completed. Simultaneous scheme is used to provide logistic optimization of operations for the construction of wells or to conduct operations, engaged in aniu using other, usually smaller rigs and vessels than those that were used during drilling.

Typically, the first phase of the construction of the well includes drilling the wellbore. Figure 1 shows an example of a typical subsea well 10 drilled, but not yet conserved. In accordance with figure 1, the well 10 has a mouth 11 and equipped with a bottom rail platform 12. The underwater unit blowout preventer 40 and an associated riser column 42 is placed on the mouth 11 of the well to provide well control during the drilling process. Subsequent well control provide by placing at least two independently proven partitions in other places.

When drilling continues to extend the wellbore and into the well 10 has consistently set additional casing pipes. In the example shown in figure 1, first of all establish the first casing 14 nominal diameter of 30 inches. The second casing 16 nominal diameter of 20 inches is introduced into the mouth 11 of the well and fixed with cement in place. The third casing 18 nominal diameter 133/8inch set inside the second casing 16. The fourth and last casing 20 having a nominal diameter of 95/8inch, is placed within the third obsa the Noah of the column 18.

In wells with a surface wellhead casing may extend from the bottom of the sea to the floor of the drilling rig 46 or to the lower deck 44 offshore platforms. The wellhead is usually located on the top edge of the wellbore on the line of the seabed for subsea wells, level platform for wells with a surface wellhead or at the level of the surface of the earth for ground wells.

After you install the required number of casing strings, usually, though not necessarily, set shank (column-shank) 22, which on the surface does not come out. The shank is usually hung by the hanger shank 24 that is installed inside the deepest casing string 20.

During the drilling of the well in the trunk usually maintain a fairly high level of hydrostatic pressure of the drilling fluid in excess of the expected pressure from the reservoir or reservoir, into which proburivaya well. But when the necessity of shutting wells should be installed additional partitions.

The requirement for continuous availability of the second partition during drilling operations and service of the wellbore satisfies accommodation at the wellhead unit BOP. Some of casing, liner and suspension (suspension device) shank, the first Prigorodnyi column for completion descend through the channel block BOP. For subsea wells, in which the block BOP is not on the surface, spuskaemogo downhole equipment should be drained through the channel riser columns associated with underwater unit BOP.

To provide opportunities to lower downhole equipment through the block BOP, the nominal diameter of the internal channel is usually 183/4inches, which is the reason that the block is a highly dimensional piece of equipment. On subsea wells, the time required for descent and/or ascent of the block BOP, depends on the distance between the water surface and the seabed and at great depths can be up to several days. The economic efficiency of offshore operations is directly dependent on the time spent on various operations on construction. Therefore, the descent and ascent of the block BOP is one of the most expensive operations in the construction of subsea wells.

When using known from the prior art methods, the first partition "B1" are usually installed above the collector or reservoir, as shown in figure 2. If the well should be preserved, it is necessary to install a second partition "B2" in any on the ugogo place in the wellbore and to check it before removing the block BOP.

Long-accepted industry practice is to have a second partition B2 near the upper end of the well, usually at the mouth of the 11 wells, or in the upper end of the latter from the casing 20, as shown in figure 2. This second partition B2 is typically implemented in the form of cement plugs. Recently, however, the cement tube began to replace mechanical partitions, which is associated with the problems of preserving the purity deleting cement plugs. Types of mechanical partitions used as the second partition, include devices that are removed with the help of a rope or drill pipe, such as plugs and packers.

There are a number of factors contributing to the motivation of software developers to place the second wall near the top of the well. One of the main is low cost lowering and/or lifting of the second partition when it is placed in the upper part of the wellbore. Also widely believed that the first and second partitions must defend from each other as far as possible, to facilitate an independent review of each of them. At the close arrangement of the first and second partitions, independent verification of the integrity of the second partition was considered almost impossible. The integrity of the first partition check, filling the borehole mud and POPs the Lord excess pressure in the column of the solution to the given value. Due to the compressibility of the solution or are passionate about them gas pressure before lining, usually falls short. If a partition occurs, pressure equalization occurs.

This technique is repeated after installation of the second partition. When the second partition is located near the upper end of the wellbore, the amount of mud required to test for leaks and to which is attached the excess pressure, while maintaining the integrity of the second partition is very small. Therefore, the penetration of the solution through the top wall are easy to spot.

To prepare the well for operation in the wellbore set "column for completion". The term "column for completion"as used hereinafter in this application, refers to pipes and equipment that are installed in the wellbore to ensure the production of hydrocarbons from the reservoir. On the upper end of the column for completion usually ends pipe suspension, for which it is suspended. Column for completion usually includes a ring-shaped operating packer, located near the lower end of the column. The packer isolates the annulus of the wellbore from the column to completion, and the annulus is question is ransta, through which may leak fluid, located between column for completion and casing and/or liner. The lower end of the column for completion is usually called "tail pipe".

When the well is ready for operation, the oil, water and/or gas pass through the shank or casing pipe and through the column for completion to the control unit operational flow wells, located at the wellhead or on it.

The conservation methods well known in the prior art, require you to remove the top baffle before well completion. To ensure the availability of the required second partition, you will have to reinstall over the well block blowout preventer, which is a long time and widely used in industrial practice. The block BOP cannot be removed prior to the installation of at least two partitions anywhere in the borehole. The requirement to install the unit BOP raises a number of problems. First, all operations to be carried out before removal of the unit preventers, limited to such equipment, which is able to pass through the inner diameter of the channel block BOP. Secondly, in the channel unit BOP (and related neither the riser column for subsea wells) may be garbage, such as wear, cement and/or chips in the dies (shut-off elements) or the annular cavities of the block preventers, as well as fragments of drilling cuttings in drilling the shell and/or in the nipple line, and/or corrosion products in the riser column. Therefore, one of the problems in the practice of wells construction of the prior art is the large amount of debris that accumulates with the passage of the convoy to completion and other equipment through the channel block BOP and/or its associated riser columns. Thirdly, the need to deflate and return to the place of the block BOP operations for well construction are considerable costs that increase the cost of these operations, which is directly proportional to the duration spent on these operations time spent drilling rig on the well.

There is a need to develop occupying less time and, therefore, cheaper method of construction of wells.

It should be understood that although the proposal uses references to the prior art, these links do not constitute an acknowledgment that the request is part of a well-known prior art, in Australia or any other country.

In a brief presentation the research Institute of the invention, and in the further description and the subsequent claims, with the exception of those cases when it is connected with necessity, dictated by the language, or need a special way to Express the meaning of the word "contain/incorporate or form, such as "contains/comprises" or "comprising/including"are used in covering the value, i.e. with the purpose to determine the presence of the claimed features, but not to a priori exclude the presence or addition of further features in various embodiments of the invention.

Summary of the invention

The present invention is based on the implementation of the discovery that the operations for the construction of wells can radically simplify, placing each of the at least two independently verifiable partitions (tightness each of which can be independently verified) below the expected depth of the lower end of the column for completion. At refusal of placement of each of these partitions in the wellbore above, both partitions can remain in place during operations on conservation and completions, which leads to the elimination of the need to use block BOP as an additional means of control over the well. The result of this is that knowledge is sustained fashion save time finding the well drilling rig and, therefore, the cost of well construction is significantly reduced.

The term "partition"is used in this description and the claims, refers to physical means, capable of forming a stopper to prevent the uncontrolled release of fluid flow from the side wall, which is under pressure. To perform the function of blocking the tool must be able to maintain its position in the wellbore. The partition does not have to be retrieved. Several tools can be used in combination to create partitions and in this case, one or more appropriate means serves as a means of sealing, and one or more tools are used to secure the partition in place, usually flush with the inner wall of one of the casing or liner.

The term "deep-set partition"used in the present description, refers to a partition which is placed below the level of the lower end of the tubing of the column (usually suspended by means of suspension tubing of the column or other device)when the column is installed in its final position in the well.

The term "block BOP", as used in this application includes both blocks preventers, set the flow on the surface, and underwater units. Block BOP usually contains a combination of tubes and solid dies, the annular protective equipment, nipple lines and lines of killing, and may include at the bottom coupling and going up and/or down the riser column.

In accordance with one aspect of the present invention offers a method of conservation of wells, in accordance with which:

set in the well of the first wall,

verify the integrity of the first partition,

set in the well above the first partition at least one second wall forming a space between the first and second partitions, and

verify the integrity of the second partition,

the first and second partitions are below the lower end of the column for the completion of wells installed in the well and remaining in place until it closed.

In a preferred embodiment, the integrity of the second partition includes a measurement of the pressure in the space between the first and second partitions.

In a preferred embodiment, one or both of the first and second partitions are selected from the following group: cement tube, unperforated liner, unperforated section of the casing, the valve head of the shank, glucholazy, insulating cover extending packer, drop cap, rupture disk, or hydraulic packer-tube.

One or both of the first and second partitions can be made in the form of a combination of the physical device, the means of its fixing in the hole sealing means. In a preferred embodiment, the sealing means selected from the following group: ball valve, butterfly valve, a sliding sleeve, a pressure seal cyclic actions extracted rope tube rupture disk, the tool zonal isolation, knife, and opened by the pressure of the tool.

The sealing means may be placed at some distance from the specified physical device or in the same place.

In a preferred embodiment, the method further establish the suspension of the first shank or suspension of the first and second shanks. Most preferably, one or both of the first and second partitions were installed inside the suspension first or the second shank.

As an alternative or Supplement to well establish the first shank or the first and second shanks. In this case, most preferably, one or both of the first and second partitions were installed inside the first or the second shank.

In a preferred embodiment, the well contains p is at least one casing, and the first and/or second partitions mounted within at least one casing string.

In accordance with the second aspect of the present invention proposes a method of well completion, in accordance with which:

set in the well of the first wall,

verify the integrity of the first partition,

set in the well at least one second partition in position on the first wall, with the formation of a space between the first and second partitions,

verify the integrity of the second partition,

through the first and second partitions to provide well control during installation into the well pipe string to completion, and this column has a bottom end, and

install the control unit operating flow rate for controlling the flow of fluids through the well,

the first and second partitions are located under the bottom end installed in the borehole column for completion.

In a preferred variant of the method before the installation phase in the well column to its completion in the wellhead install pipe head.

The control unit operating flow rate can represent the tree.

In preferred options the ante regulation operational flow rate can be horizontal surface valves. Most preferably, the horizontal wellhead equipment had a case in which its upper end ending column for completion, suspended by the suspension of the column and the method further includes the step of an Assembly containing the horizontal x-Mas tree valves and suspension columns, by planting suspension columns on the body horizontal x-Mas tree and fixing the suspension on the chassis before you install phase on the well control device operational flow.

Alternatively, wellhead equipment can be vertical surface valves.

In accordance with a third aspect of the present invention proposes a method of repair of the completed wells containing the control unit operating flow rate and the column for completion set out in the barrel and having a lower end and an upper end fixed in the suspension of the column for which it is suspended, namely, that:

set in the well of the first wall,

verify the integrity of the first partition,

set in the well above the first partition at least one second wall forming a space between the first and second partitions,

verify the integrity of the second partition,

through the first and second pereg rodoc provide well control during removal from the well of the suspension column, columns for completion or control device operating flow rate, or both,

the first and second partitions are located under the bottom end installed in the borehole column for completion.

In a preferred embodiment, the horizontal wellhead equipment has the case and the method further comprises the step of removal of the suspension column and/or columns for completion of the housing horizontal x-Mas tree by detaching the suspension columns from the case of x-Mas tree.

Alternatively, the horizontal wellhead equipment has a housing, and the method includes the step of removing the horizontal x-Mas tree and columns for completion in the form of a single node.

In a preferred embodiment, the method of repair of wells includes the step of using the first and second partitions to ensure well control up until the suspension of the column, the column for completion and/or the control unit of the operational flow rate of the well will not be re-installed in the well.

In accordance with the fourth aspect of the present invention serves well conserved, containing:

the wellbore having an upper end,

the wellhead equipment installed in C is the upper end of the wellbore, and

at least one first and one second independently tested septum, placed in the wellbore at a distance from each other forming a space between them, and the first and second partitions are below the proposed depth of the lower end inserted in the hole of the column to completion.

In accordance with the fifth aspect of the present invention offers a complete bore containing:

the wellbore having an upper end,

the wellhead equipment installed in the area of the upper end of the well bore,

the control unit operational flow wells, installed at the wellhead or on him,

the column for the completion of wells, installed in the borehole and having a lower end, and

at least one first and one second independently tested septum, placed in the wellbore at a certain distance from each other forming a space between them and under the lower end of the column for completion.

In a preferred embodiment, the suspended or completed wells contain an additional pressure measurement to generate a signal characterizing the pressure in the space between the first and second partitions. More preferably, Zack is servirovana or finished bore additionally contain means of the reception signal, generated by the measurement device pressure. Even more preferably, the suspended or finished bore additionally contain means of transmission of the signal from the pressure measuring means receiving the signal pressure.

In a preferred embodiment, the device for measuring pressure is the gauge.

The suspended or completed well may be underwater, ground, or a well with a surface wellhead.

In a preferred embodiment, the suspended or finished well also include the first shaft or the first and second shanks installed in the well. It is most preferable that one or both of the first and second baffles were placed in the first or second shank.

In a preferred embodiment, the suspended or finished borehole contains at least one casing and one or both of the first and second partitions are placed inside the casing string.

In a preferred embodiment, the finished borehole includes the additional tubular cylinder installed in the wellhead.

In a preferred embodiment, the control unit operating flow rate of the well is gushing valves. More preferably, the control unit operating the de is it well was a horizontal Christmas tree. Alternatively, the control unit operating flow rate can be vertical surface valves.

In accordance with the sixth aspect of the present invention suggests a system of double walls for use in conservation, completion, or repair of wells containing:

the first and second partitions placed in the wellbore at a distance from each other with the formation of the space between them,

the means of measuring pressure for generating a signal characterizing the pressure in the space between the first and second partitions,

means receiving the pressure signal generated by means of pressure measurement, and

the means of transmission of the signal from the pressure measuring means receiving the signal pressure.

In accordance with the seventh aspect of the present invention proposes a method of completion of underwater wells using horizontal x-Mas tree for regulating the operational flow rate of the well, namely, that:

collect node by setting the upper end of the column for completion in the suspension of the column for which it hung, and which is held in a horizontal wellhead, and

put the assembled host to an underwater well,

moreover, the Assembly pointed to by the th node of the suspension column and a horizontal x-Mas tree valves feature above the surface.

In a preferred embodiment, the Assembly further includes a landing charms columns in the case of x-Mas tree and fixing the suspension on the chassis. In a more preferred variant of the method of completion of underwater wells using horizontal x-Mas tree for regulating operational flow additionally includes checking the integrity of the collected node above the surface.

In a preferred embodiment, the integrity check includes a check of hydraulic and electric coupling places the suspension of the column with the case of x-Mas tree. In the most preferred embodiment, the integrity verification further includes checking the tightness of the node.

In the preferred embodiment, when the shutter is host to well implement the installation of the module (block) lower part of the riser column on a horizontal Christmas tree.

Brief description of drawings

Below the invention is illustrated on the example of the preferred embodiment with reference to the accompanying drawings, in which to designate the same structural elements used a similar reference numbers and in which is shown:

figure 1 - typical borehole before conservation using methods of preservation prior art,

on IG - well preserved in accordance with the usual method of conservation of the prior art,

figure 3 - the first stage of the sequence completion in the first embodiment of the present invention depicting the placement of casing and liner, and double deep planted partitions while on location block BOP,

figure 4 - the next phase sequence completion in the first embodiment of the present invention depicting conserved well with a double deep-set partitions,

figure 5 is an example system of a double blocking used in the preservation of the well,

figure 6 is the next stage in the sequence of completion in accordance with the present invention with the image node horizontal x-Mas tree and suspension column after preservation wells in accordance with figure 4,

figure 7 is the next stage in the sequence of completion in accordance with the present invention depicting the use of the module lower part of the riser column for descending node horizontal x-Mas tree and suspension column to the mouth of the well,

on Fig is the next stage in the sequence of completion in accordance with this is their invention with the image node horizontal x-Mas tree and suspension of the column in position at the mouth of the well,

figure 9 is the next stage in the sequence of completion in accordance with the present invention depicting the installation of double walls in the suspension column and/or a protective cap subsea x-Mas tree or in a combined node charms and cap,

figure 10 - final stage sequence completion in accordance with the present invention depicting the completed wells with double walls in the suspension of the column and the cap pendants columns

figure 11 - one step sequence completion in accordance with the first variant of the present invention using a vertical x-Mas tree for regulating the operating flow rate, with the image tool use for lowering the suspension column and guide mechanism for guiding, landing and fixing the suspension of the column at the wellhead,

on Fig next stage in sequence completion in the first embodiment of the present invention depicting the vertical x-Mas tree together with the module lower part of the riser column and a connecting device capable of emergency undocking, which are prepared on the lower deck,

on Fig is the next stage in the sequence of completion for PE is the first version of the present invention depicting well after as vertical wellhead equipment, module lower part of the riser column and the connecting device capable of emergency undocking, installed over the suspension of the column

on Fig is the next step in the sequence completion in the first embodiment of the present invention depicting well, when deep-set partitions removed, and the reliability of well control is responsible fountain valve vertical x-Mas tree and/or the module lower part of the riser column with the implementation of the statutory requirement of at least two verifiable partitions,

on Fig - finished bore in the first embodiment of the present invention, when the protective cap underwater wellhead equipment is set in place,

on Fig - one step sequence completion in accordance with the second preferred variant of the present invention depicting the placement of the tubing head in the wellhead after preservation wells in accordance with figure 4,

on Fig next stage in the sequence of completion in accordance with a second embodiment of the present invention depicting the use of a tool for lowering the suspension column and guide mechanism for guiding and planting suspension Colo who were on the tubular cylinder, and locking charms on the head,

on Fig is the next stage in the sequence of completion in accordance with a second embodiment of the present invention depicting the vertical x-Mas tree together with the module lower part of the riser column and a connecting device capable of emergency undocking, prepared on the lower deck, while the double deep-set partitions saved in place,

on Fig is the next stage in the sequence of completion in accordance with a second embodiment of the present invention depicting well after vertical wellhead equipment, module lower part of the riser column and the connecting device capable of emergency undocking, mounted above the suspension column, deep-set partitions removed, and the reliability of well control meet the regulators in each of the vertical channel vertical x-Mas tree and/or the module lower part of the riser column, and

on Fig - finished well on the second version of the present invention, when the protective cap underwater wellhead equipment is installed in its place, and

on Fig-23 - alternatives system design dual partitions compared to those depicted in figure 5.

Description of the preferred options, the ants carry out the invention

Before proceeding to the description of the preferred embodiments of the present invention, it should be noted that it is not limited to any specific sequence of operations or any of the types described partitions. It should also be understood that the terminology used here is used solely for the purpose of describing a particular implementation options and are not intended to limit the claims of the present invention. Unless otherwise indicated, all materials used in the application of technical and scientific terms have the meaning which it put the usual experts in the field of technology to which the present invention relates.

In the present application is related to the conservation, completion and repair of subsea wells describes the preferred options for partitions and means of implementation, however, other types of partitions and the specific sequence completion and/or workover, similar or equivalent to those described in the application, can be used in practice, or to test various aspects of the present invention. It should be understood that this invention is equally applicable to both onshore wells, and wells with a surface wellhead.

It should be noted that figure 1-20 not reduced to determine the n scale, and that the length of the various Elevator and casing and/or liner will be different depending on the circumstances of a particular field, such as the depth of water above the bottom line, as well as the depth and geological characteristics of the particular reservoir or reservoir tank, which is directed drilling. For example, for subsea wells, the bottom line may be on 20 and 3000 meters below water level, and the reservoir or reservoir tanks can lie at a depth of approximately one to three miles below the line of the bottom.

It should also be noted that the underwater wellhead equipment options, shown in figure 3-10 refers to the single-channel type, while the underwater wellhead equipment options shown on 11-15 and 17-20, belongs to the two-channel type. It should be understood that various aspects of the present invention are equally applicable to single-channel, two-channel and multi-channel wells.

The first preferred variant of the method of preservation is well illustrated by the sequence figure 3 - figure 4. In accordance with figure 3 subsea well 10 drilled, equipped with the mouth 11 and set bottom to guide the platform 12. For the temporary control of the well at the wellhead 11 installing the underwater unit blowout preventer 40, and an associated riser to the Onna 42. Subsequently, the well control will be carried out by placing in a certain place at least two independently verifiable partitions.

In the well 10 is set to the desired number of casing strings. In the variant illustrated in figure 3, the first casing 14 nominal size 30 inches is installed in the first place. The second casing 16 nominal size 20 inches down through the mouth 11 and cement in position. The third casing 18 having a nominal size 133/8inch, set inside the second casing 16. Fourth, and last, the casing 20, having a nominal size 95/8 inch, set inside the third casing 18.

It should be understood that while figure 3 shows four concentric casing, the present invention is equally applicable to underwater wells equipped with any number of casing strings with other nominal sizes that may be required.

Figure 3 shows that the further inside the last casing string 20 establish the first shank 22. The shank 22 is suspended for the suspension 24 of the first shank. It should be borne in mind that while the shank 22 and its suspension 24 used in the embodiment illustrated in figure 3, shows how the conservation of the well equal about what atom applicable to wells, you are not using shanks and charms for them. The first deep-set partition 26 is installed in the suspension 24 of the first shaft and/or the first shank 22. Then verify the integrity of the first partition 26. Later in the last casing 20 above the suspension 24 of the first shank place the hanger 28 of the second shank together with the second shaft 23, by setting the space 35 between them. The second deep-set partition 30 is installed in the hanger 28 of the second shank and/or the second shank 23 and independently verify the integrity of the second partition 30.

One of the preferred options for the installation of two independently verifiable deeply planted partitions in the form of a system of 32 dual partitions (dual-blocking) is shown in figure 5. In accordance with figure 5 of the first partition wall 26 is made as a combination of a physical device in the form of a first stub (tube) 25 and a separate sealing means in the form of a first annular seal 27. The first bracket 25 is fixed and overlaps the channel of the suspension 24 of the first shaft and/or the first shank 22. The first o-ring seal 27 in conjunction with the suspension 24 of the first shaft and/or the first shank 22 overlap the gap between the outer wall of the suspension 24 of the first shaft and/or the first shaft 22 and the inside is it wall last of the casing 20. Then, using known techniques verify the integrity of the first partition 26.

The second partition 30 system 32 dual partitions, as shown in figure 5, is formed first by setting the second suspension 28 of the second shank together with the second shaft 23 above the suspension 24 of the first shank forming space 35 between them.

The second wall 26 are in the form of a combination of a physical device in the form of the second stub 27, which represents a removable cable plug, and a separate sealing means in the form of a second annular seal 29. The second bracket 27 fixed and overlaps the channel of the suspension 28 of the second shank and/or the second shank 23. The second annular retainer 29 in conjunction with the suspension 28 of the second shank and/or the second shank 23 overlaps the gap between the outer wall 28 of the second suspension of the shank and/or the second shank 23 and the inner wall of the last casing string 20.

Might be further verified the integrity of the second partition 30. Previously it was thought that the partition on which to rely for the implementation of well control during operations, completions and workover, should not, as discussed above, be located close to one another. It is connected with the popular opinion about zatrudnienie check into the dependence of the second partition with a relatively small amount of space between the partitions.

This problem can be circumvented in the variant shown in figure 5, by installing a means of measuring the pressure sensor 34, the pressure in the space 35 between the first and second partitions. The sensor 34 pressure capable of generating a signal characterizing the pressure in the space 35. The signal from the sensor 34, the pressure is transmitted to the receiver pressure signal using any suitable means, such as radio, destructible wire line or split wire line.

In the variant shown in figure 5, the receiver 36 of the pressure signal built-in drain tool 38 to the stub, which has electrical connection with the device decryption pressure signal (not shown)located above the surface of the water, usually on a platform 46 rig or, less preferably, on the lower deck 44.

It should be understood that the sensor 34, the pressure need not be associated with the second partition 30, and the only condition is that the sensor 34 pressure was capable of generating a signal characterizing the pressure in the space between the first and second partitions. The sensor 34 pressure can, therefore, be placed on the upper surface of the first partition and the outer wall of the suspension of the shank or on the inner wall of the bottom section of sagnay columns.

When the signal from the sensor 34 pressure is received and decrypted by the receiver 36 of the pressure signal, which provides independent verification of the integrity of the second partition 30 after the integrity of the first partition 26 has been independently verified.

Placing at least two independently verifiable partitions inside mounts shanks in a preferred variant is one of the ways to accommodate these partitions. Other position of the first and second partitions in the system of double walls is described below with reference to Fig-23.

On Fig first (bottom) partition 26 is formed either by means of insulation of the top of the shank, a multi-piston device, a ball valve or damper, which form a partition across the full width of the channel of the shank 22. The second (upper) baffle 30 is created by a mechanical device, such as a cable tube, and also installed in the first shank 22.

On Fig first partition 26 is formed covering the entire channel extractable cable device or a cement plug in the first shank 22. The second partition 30 is formed by means of insulation of the top of the shank, a multi-piston device, a ball valve or damper, also established in the first shank is 22.

On Fig first partition 26 is formed covering the entire channel extractable cable device or a cement plug in the first shank 22. The second partition 30 is formed recoverable (removable) cable or a cement plug that is installed so as to completely block the channel of the last casing string 20.

The first and/or second walls, thus, may equally be selected from the following group: cement tube, unperforated liner, unperforated section of the casing, the valve head of the shank, a hollow packer, insulating cover, an expanding packer, drop cap, rupture disk, or hydraulic packer-tube.

Any one or both of the first and second partitions may be arranged in combination with means for fixing the position of the stub or with a separate sealing means. Means for fixing the position of the door, and sealing means need not be located in the same position as in the casing and the shank and/or in the suspension of the shank. Suitable sealing means include in their number, but are not limited to, the following devices: ball valves, valves, sliding sleeves, sealed caps cyclic steps, cable tube, rupture discs, devices, DL the zonal isolation, disc knives, and/or opened by the pressure device.

As one of the possible partitions can be considered and the hydrostatic pressure of the drilling fluid filling the borehole, provided that there is a possibility to observe the level of the mud column and, if necessary, to make the topping up to the top of the well. This case can be used for well completion in accordance with a preferred variant implementation of the present invention. However, when there is a need for removal of the mud column to facilitate installation in the shaft of the column to completion, to rely on such a partition is usually not necessary, especially when the preservation of the well, with the possible exception of strata characterized by low reservoir pressure.

Equipping the borehole 10 two independently proven deep-set partitions 26 and 30 can be dismantled and to raise the oil rig block blowout preventer 40. Well, as shown in figure 4, this can be considered suspended and now it can be finished or left in this position for completion after some time.

The advantage of preservation of the wells in this state, i.e. with the first and second deep-set partitions that are on your place, Zack is udaetsya is the first time it becomes possible to set the column to completion without having to use the unit blowout preventers to ensure that one or both partitions.

Another advantage provided by the ability to preserve well in this position, with at least two deep-set partitions, is that it becomes possible to drill and to conserve several wells in the formation of one field using drilling rigs block blowout preventer 40 and a conduit system for casing, liners and columns for completion. When therefore, as shown in figure 4, can several wells, the unit blowout preventer 40 is no longer needed, and the rig can be moved to another location. Moreover, when conducting drilling and conservation of several wells using variants of the present invention, the block blowout preventer 40 can be moved in the horizontal direction (under water) from one well to another without having to lift it on the oil rig when moving from hole to hole. Therefore, the potential exists for completion of closed wells using vessels less the type, than is normally required for setting the suspension of the operating pipe and the vertical x-Mas tree.

Another advantage of the conservation of the well, as shown in figure 4, consists in the possibility of periodic measurements of the suspension of the casing through the submersible remote control, as well, if necessary, remains preserved.

The sequence of steps used for completion ready for operation, partly depends on the type of control device operating flow rate of the well or wellhead equipment selected to regulate the flow from the well during operation. It should be understood that embodiments of the present invention is not limited to a specific type of device used to regulate the flow of fluid into the borehole and/or from a well. Wellhead equipment is divided into two broad types, namely horizontal wellhead equipment and vertical wellhead equipment.

Following completion methods and/or repair of underwater wells using horizontal x-Mas tree as a control device operating flow rate. Typical prior art method of completion using the horizontal is antennas valve is in the following sequence of steps: (a) the unit blowout preventers used for well control during drilling, install and (optionally) install the shank, b) the first partition is set in place on the manifold or reservoir tank, check the integrity of the first partition, then install the second wall closer to the upper end of the wellbore or in the wellhead, d) to verify the integrity of the second partition, e) then from the wellhead removed the block BOP to facilitate installation at the mouth of the horizontal x-Mas tree W) block BOP again lowered and set on a horizontal wellhead to ensure well control, when the second (upper) baffle removed to skip a column for completion through the barrel, C) the instrument of descent charms columns used in combination with tree equipment for well testing with underwater wellhead in order to lose weight, through the inner channel of the underwater unit blowout preventers and associated riser column, a column for completion, suspended by the suspension of the column, and the suspension of the column guide, put on a case underwater horizontal x-Mas tree and fix the hanger to the casing, remove the lower baffle, l) establish a new first partition inside the suspension count is NY and test it, m) the new second partition is mounted above the first, usually in the inner protective cap underwater wellhead equipment, and test it, and h) when the consistency of the new first and second partitions are checked, the underwater unit blowout preventers can be extracted, and well when this is ready for operation.

Variant of the method of completion in this aspect of the present invention to wells, where the control device operational flow wells used horizontal wellhead equipment, is illustrated in connection with preserved well, shown in figure 3, 4 and 6-10. Subsea well 10 Buryats and can, as described above (see figure 3 and 4).

According to Fig.6, the horizontal wellhead equipment 50 is placed on the lower deck 44 under the platform 46 rig. Suspension 60 columns installed inside the horizontal x-Mas tree 50. Column 62 for completion suspended by the suspension of the column 60 and is equipped with downhole safety valve 64 and node packer 65. The horizontal x-Mas tree 50 has a body 52 with the tab 54 opposite the protrusion 63 of the appropriate form of the suspension 60 columns; the tabs are aligned, when the suspension 60 columns loaded to the housing 52 of the horizontal x-Mas tree 50. Horizontal fountain Armat the RA 50 may also be provided with a helical surface (not shown) for orientation of the suspension 60 columns in the horizontal x-Mas tree 50.

The installation of the suspension 60 columns in the horizontal Christmas tree hold the water surface and, more specifically, on the lower deck 44 under the platform 46 rig with the formation of the combined node 70 horizontal x-Mas tree and suspension columns (GFA/PC), which can be lowered into place in the borehole after checking the quality of the build. To verify the integrity of the node 70 GFA/PC check all hydraulic and electrical docking sites. Node 70 GFA/PC can also be checked for tightness.

The ability to perform the installation of the suspension column in the case of the horizontal x-Mas tree above the water surface and preferably on the lower deck of the drilling rig or vessel is a significant advantage compared with the need to install and check connections under water.

In accordance with 7 on node 70 GFA/PC is the module 80 of the lower part of the riser column (NBC) at the time when the node 70 GFA/PC is on the lower deck 44. The module 80 NVK equipped dies and/or valves in a vertical channel as across funds. The module 80 NBC is connected with the connecting means 90, capable emergency undocking, to allow separation module 80 NVK, if necessary, for example during a storm.

In accordance with Fig, as soon as it is on the module 80 NVK installed, node 70 GFA/PC and the module 80 NVK down at the wellhead in a single operation. During descent, the node 70 GFA/PC to the mouth 11 of the well, the well control is provided by the first and second partitions 26 and 30, respectively, which remain in place.

Above the module NBC install patched vertical pipe in this embodiment, single-shank 92 to completion, which ends in located on the surface wellhead 88. The shank 92 to completion and keep strain in the normal way to adapt to the movements of the drilling platform, depending on sea conditions. Located on the surface of the wellhead valve 88 in conjunction with the module 80 NEC provides the proper regulation of the pressure to facilitate the cable operations and/or cleaning of wells, if necessary.

Once the node 70 GFA/PC installed on the mouth 11 of the well, the tests for the integrity of the Assembly. Damming when this is done the dies and/or the valve module 80 NBC and/or valves located on the surface wellhead valves 88 and/or the x-Mas tree valves 50 in order to comply with the prescribed requirements for the presence of two independently verifiable partitions during the removal, usually with the rope, the first and second partitions 26 and 30, respectively. The first and second p is raigorodsky 26 and 30, respectively, at this stage, is removed to prepare the well for operation.

In accordance with figures 9 after removal of the first and second walls 30 and 26, respectively, it is necessary to install two new independent partitions above the level of the orifice of the release fluid 68 in the node 70 GFA/PC. The cover 96 of the suspension column and the cover 98 of the upper suspension columns or protective cap subsea x-Mas tree down on a single shank 92 to completion and set in the suspension 60 columns and/or protective cap 74 underwater wellhead equipment accordingly, to provide new partitions. Once the integrity of the stub 96 suspension column and stub 98 protective cap underwater wellhead equipment checked, the module 80 NBC and its associated shank 92 for completion of site 70 GFA/PC remove.

According to figure 10 the final step illustrated sequence of operations on the well completion is the installation of a cap 71 to trap rock fragments; usually this is done using submersible remote control. Thereafter, the well is ready for use.

When you want to carry out the repair operation of the wells using horizontal x-Mas tree for regulating the operational flow rate of the well, the steps are similar opican the m above performed in a different order. Repairs can be performed to remove damaged trees or damaged suspension columns or both structures. When using deep-set partition maintenance operation can be performed without having to descend to the well block BOP.

An example of a method of repair of underwater wells using horizontal x-Mas tree as a control device operating flow rate in accordance with one variant of the present invention is described below with reference to Fig.6-10, on which to denote identical structural elements used a similar reference numbers. As noted above, with respect to completion of the wells using horizontal x-Mas tree as a control device operating flow rate, it should be understood that the specific sequence of steps may be different depending on the purpose concrete repair operations. The following description refers to the removal of node 70 GFA/PC. At the first stage are removed, typically using a submersible remote control, cap 71 to trap rock fragments. The module 80 NVK and the connecting means 90, prepare on the lower deck 44. This node module 80 NBC the connecting device is then lowered on the shaft 92 for completion in position over the vertical surface valves. Located on the surface of the fountain valve 88 is mounted in the usual way, and the module 80 NVK mounted on the top horizontal x-Mas tree 50.

The tightness of the connections between the module 80 NBC and horizontal surface valves 50 check is usually under pressure or using a different functional diagnostics. As soon as the module 80 NBC is set in position, the die and/or the valves being in vertical channel module 80 NBC, meet the requirement for the presence of two independently verifiable partitions, which enables to remove the cover 98 protective cap underwater wellhead equipment and the plug 96 of the suspension column. These plugs are usually extracted by means of a rope.

The next step is to restore the former position of the first deep-set partitions 26, in this embodiment, the suspension 24 of the first shank. Verify the integrity of the first partition 26. Then install the second deep-set wall 30, in this embodiment, the suspension of the second shank 28, and the integrity of the partition is checked in the usual way.

Once the integrity of the first and second partitions 26 and 30, respectively checked, the node 70 GFA/PC can be disconnected from the mouth 11 of the well and raise above the surface of the water horizon 66. You can expect the first and the second partitions 26 y respectively satisfy the prescribed requirements to the presence of two independently verifiable partitions during maintenance operations.

Required commissioning, preventive and other maintenance work horizontal x-Mas tree and/or suspension of the column, usually carried out on site 46 rig or on the lower deck 44. Upon completion of the repair node 70 GFA/PC restore above the water line of the horizon 66 and return into the well 10 using the techniques described above in relation to the implementation completion when using a horizontal x-Mas tree as a control device operational production of the well.

It should be understood that the repair operation in accordance with this aspect of the present invention, if desired, can be made without removing the horizontal x-Mas tree. In this case, the module 80 NBC and its associated shank 92 to completion lowered into the borehole, as described above, which enables to remove the protective cap 74 underwater wellhead valves and plugs 98 and 96 in the suspension column. The first and second deep-set partitions 26 and 30 establish and verify, as described above. The module 80 NVK then raise the deck 44.

To remove only the suspension 60 columns (with column 62 for completion, suspended by the suspension 60), well down the tool for lowering the suspension column (not shown), which are to be separated under ESCO 60 and the case of x-Mas tree and raise the suspension 60 together with the column 62, leaving the horizontal x-Mas tree valves 50 at the wellhead 11.

For wells where to regulate the operational flow using a horizontal Christmas tree, examples of completion and/or repaired in accordance with the variants of the present invention are described in detail below with reference to 11-20, on which to designate the same structural elements used a similar reference numbers. First, the well Buryats, grow and preserve, as described with reference to figure 3 and 4.

In accordance with 11 column 62 for completion gather on the platform 46 drilling rigs, tooling the upper end of the suspension 60. The tool 200 for lowering the suspension columns have over suspension 60 columns and used for orientation, planting and fixing of the suspension column on the mouth 11 of the well. The tool 200 for the descent of the suspension column is also used to provide a seal between the suspension 60 columns and the mouth 11 of the well. The tool 200 for lowering the suspension of the column is equipped with a mechanism 202 orientation of the suspension column, which is configured to provide coupling with the guide devices located on the bottom rail of the platform 12. When using concentric x-Mas tree, you can do without this mechanism 202.

Suspension 60 columns and disannul for her column 62 for completion lowered into the well through the open water with the tool 200 for the descent of the suspension column and a mechanism 202 orientation of the suspension column. The shank 92 to completion or column for descent departs from the tool 200 for the descent of the suspension column to the platform 46 rig. During the descent into the well column 62 of the tool 200 for lowering the suspension columns with mechanism 202, the primary well control provide at least two independently verifiable walls 26 and 30. These walls remain in place at least until such time as column 62 for completion will not be installed at the mouth 11 of the well.

After checking the orientation of the suspension 60 columns relative to the mouth 11 of the well, if necessary, using the tool 200 for the descent of the suspension column and a mechanism 202 orientation of the suspension column, suspension 60 columns is seated on the mouth 11 of the hole and fixed in place. The quality of the installation of the suspension 60 columns in well control, checking the hydraulic and electrical docking sites charms 60 columns with the mouth 11 of the well and/or any downhole equipment.

The tool 200 for the descent of the suspension column and its associated mechanism 202 orientation of the suspension column and a shank 92 to completion then pull on the rig floor. As shown in Fig, vertical wellhead valve 51 with the same number of flow channels, as in the suspension 60 columns, located on the lower deck 44. If necessary, vertical the real x-Mas tree valves 51 will be equipped with a means of orientation to assist in its proper orientation relative to the already installed suspension 60 columns.

In accordance with Fig module 80 NVK is located above the vertical surface valves 51 on the lower deck 44. The module 80 NVK equipped dies and/or valves in a vertical channel as a means of ensuring the blocking. The module 80 NVC is a much smaller site than the block blowout preventer 40, and therefore, it can be lowered with a smaller vessel, as compared with that required for placement and release block blowout preventer 40. The module 80 NVC is used in conjunction with the connecting means 90, to allow separation of the shank 92 to completion module 80 NVK, if necessary, for example during a storm.

In accordance with Fig module 80 NBC, the connecting means 90 and the horizontal x-Mas tree valves 51 is lowered into the well and set on the mouth 11 of the well. Stackable vertical tube in this embodiment is a dual shank 92 to completion departs upward from the connecting means 90 to the platform 46 rig. The shank 92 to completion and keep strain in the usual way known from the prior art, to adapt to the movements of the drilling platform, depending on sea conditions. Located on the surface of the fountain valve 88 is used in conjunction with module 80 N Is K and/or fountain valve 51 to control the pressure during the cleaning of the well and to facilitate the operation, associated with logging and/or perforation.

In accordance with Fig, as only vertical wellhead equipment 51 oriented, planted on the mouth 11 of the well and fixed it, testing hydraulic and electrical coupling places a suspension of 60 columns and/or mouth 11 wells with a vertical surface valves 51. Each of the flow channels of the vertical x-Mas tree 70 GFA/PC equipped with at least two valves, plugs and/or caps 75, which is used to regulate the flow from the well during the operation.

They expect to die in the module 80 NVK, valves in the node located on the surface wellhead valves 88 and/or the valves in the wellhead 51 as a means to meet the prescribed requirements for the presence of two independently verifiable partitions. At this time, the second and the first partition, 30 and 26, respectively, are removed, usually by means of a rope or any other suitable means for removal depending on the type of partitions. The module 80 NVK and the connecting means 90, as well as the associated shank 92 to completion raise on the floor of the drill 46.

In accordance with Fig on the vertical x-Mas tree valves 51 and then put on a protective cap 77 subsea x-Mas tree and the well of SciTE the Xia finished.

The way of the completion of an underwater well, comprising a tubular cylinder, illustrated Fig-20. Pipe head is used in cases when downhole conditions dictate the need for a large number of flow paths and communication from the wellbore to the vertical wellhead 51. When using tubing head some way communications can be made through the head, and not the suspension column. In this embodiment there is the possibility to lower the suspension cylinder tubing string from the vessel, characterized by the type of drilling vessel required for placement and release block BOP.

First and second independently verifiable walls 26 and 30 respectively mounted in the situation described in the first embodiment with reference to Fig 3 and 4. In accordance with Fig bottom guide platform 115 pipe heads installed on top of the bottom rail of the platform 15 for completion. Then pipe the head 110 is installed in the mouth 11 of the well preserved in accordance with figure 4. Bottom guide platform 115 tubing head can be used as an aid in the orientation of the suspension 60 columns relative to the tubing head 110. As alternatives to implement this feature tubular cylinder 110 may include zadatchikami.

In accordance with Fig column 62 for completion assembled so that its upper end is in suspension, 60 columns, as described above. The tool 200 for the descent of the suspension column and its associated mechanism 202 orientation of the suspension columns are used for orientation of the suspension 60 columns relative to the tubing head 110. Alternatively, if desired, instead of a tool 200 for the descent of the suspension column for tubular cylinder 110 can be set by the specified mechanism 202. Upon reaching the correct orientation suspension 60 columns is seated on a tubular cylinder 110 and is fixed in this position. Then check the tightness of the contact surfaces of the suspension 60 columns and tubing head 110. The tool 200 is removed to allow for a vertical Christmas tree 51.

In accordance with Fig vertical wellhead valve 51 with the same number of flow channels, as in the suspension 60 columns, placed on the lower deck 44. If necessary, vertical fountain valve 51 can be equipped with a guiding tool that promotes proper orientation vertical x-Mas tree 51 relative to the already installed suspension 60 columns. The module 80 NVK is located above the vertical surface valves 51 on the lower deck 44. The module 80 NVC is used in conjunction with the connecting medium spans the PTO 90, capable of emergency undocking, to allow separation of the shank 92 to completion module 80 NVK, if necessary, for example during a storm.

The module 80 NBC, the connecting means 90 and the vertical Christmas tree 51 is lowered into the well and set over the tube head 110. Stackable vertical pipe, in this embodiment, dual - shank 92 to completion goes over the connecting means 90 to the platform 46 of the drilling rig.

In accordance with Fig after installation of wellhead equipment over the pipe head 110 and suspension 60 columns, the first and second deep-set partitions 26 and 30, respectively, are removed, as was described above for the first preferred variant embodiment of the invention. The supply valves 75 fountain valve 51 closed, to be able to remove the module NBC; if desired, the well will be equipped with protective cap 77 subsea x-Mas tree, which is shown in Fig.

When you want to carry out the repair operation of underwater wells, where for regulating operational flow wells used vertical Christmas tree, the steps similar to those described above, are performed in a different order. The purpose of the repair may be to restore the damaged wellhead equipment, damaged evaluation of the key columns and/or damaged columns for completion. As the first stage of the renovation and operation of the first and second partitions 26 and 30, respectively, in turn reinstall and check to ensure well control before removing the vertical x-Mas tree 51 and/or suspension of 60 columns. And again, the use of two deep-set and independently verifiable partitions allows the repair operation without having to run to the well block BOP.

A typical sequence of repair operations for wells using vertical x-Mas tree for regulating the operational flow rate of the well is described below with reference to illustrated on 11-15 variant implementation. It should be noted that if the hole contains a pipe head, tube head usually remains in place on the wellhead until repairs are performed on the suspension column and/or vertical wellhead.

To perform repair operations that require the removal of the suspension 60 column, remove the protective cap 77 subsea x-Mas tree, usually using submersible remote control. The module 80 NVK and the connecting means 90 prepare on the lower deck 44 and lowered into the well. Located on the surface of the fountain valve 88 is mounted usually the first image, and on the vertical Christmas tree set module 80 NBC. The tightness of the connections between the module 80 NBC and vertical surface valves check in the usual way.

When the module 80 NVK installed, dies and/or valves in the vertical channel is able to meet the requirements for the presence of two independently verifiable partitions, giving the opportunity to meet with the regulators 75 flow in vertical flow channels vertical x-Mas tree 51.

The next step is to reinstall the first and second partitions 26 and 30, as described above with reference to figure 4. Once the integrity of the first partition 26 tested, installed, and then checked the second partition 30. Vertical Christmas tree 51 can then be disconnected from the suspension 60 columns and extract the oil platform where the repair work. Suspension 60 columns can also disconnect and remove the oil platform for repair, adjustment, and other necessary works.

Repair work is usually on the platform 46 rig or on the lower deck 44. By repairing the suspension 60 columns return and set in the mouth 11 of the well or pipe head 110 in such a way as described above for completion. Vertical x-Mas tree valves 51 and then also again be the more on the mouth 11 of the wells using methods described above in connection with methods for completion.

The present invention is described in detail on the example of the preferred embodiments, has a number of advantages over the prior art, including the following:

a) to prevent from having to re-release unit BOP during operations, well completions,

b) the ability to use the module lower part of the riser column instead of block BOP during installation on subsea well control device operational flow wells,

C) the ability to limit the use of the module lower part of the riser column instead of block BOP for repairs and works on prevention of emergency situations provides significant savings due to the removal of the traditional requirements for application for subsea wells drilling unit BOP and riser columns,

d) decreases the risk of falling rocks in the suspension column, since the suspension of the column does not require channel block BOP (and also in the riser column for subsea wells).

For wells where to regulate the operational flow rate is used, the horizontal font is Naya fittings, the methods of the present invention provide additional advantages, including the following:

d) the ability to perform the installation of the suspension column in the case of the horizontal x-Mas tree above the water surface, which is much easier than doing so under water, and any repair actions are simplified

e) the ability to mount and check all electrical and hydraulic connections and openings above the water surface,

g) avoid the necessity of using underwater test wellhead equipment for subsea wells with a horizontal surface valves, and

C) the ability to use for wells with horizontal surface valves module lower part of the riser column instead of wellhead equipment for well testing with the underwater wellhead. The specified module is a much more durable and reliable equipment, in addition, there is no need to look for expensive leased equipment.

The implementation of the invention was described above on the example of his particular options, however, the specialist should be obvious possibility of carrying out the invention and in other modified versions. It is assumed that any such changes are subject to the claims set forth in the attached formula invented the I.

1. Method of conservation, completion, or repair of wells, which consists in the fact that set in the hole of the first partition, verify the integrity of the first partition, set in the well above the first wall, at least one second wall forming a space between the first and second partitions and verify the integrity of the second partition, the first and second partitions are below the lower end of the column for the completion of wells installed in the well and remaining in place until it closed.

2. The method according to claim 1, in which the integrity of the second partition is implemented by measuring the pressure in the space between the first and second partitions.

3. The method according to claim 1, in which one or both of the first and second partitions are selected from the following group: cement tube, unperforated liner, unperforated section of the casing, the valve head of the shank, a hollow packer, insulating cover, an expanding packer, drop cap, rupture disk or hydraulic packer-tube.

4. The method according to claim 1, in which one or both of the first and second partitions set as a combination of the physical device, the means of its fixing in the hole and sealing means.

5. The method according to claim 4, in which the sealing means is about choosing from the following groups: ball valve, flap, sliding sleeve, a pressure seal cyclic steps, removable cable tube rupture disk, the tool zonal isolation, knife and/or opened by the pressure of the tool.

6. The method according to claim 5, in which the sealing means is placed at a distance from the specified physical device.

7. The method according to claim 1, in which is installed in the borehole suspension of the first shank or suspension of the first and second shanks.

8. The method according to claim 7, in which the first and second partitions are mounted inside the suspension first or the second shank.

9. The method according to claim 7, in which is installed in the bore of the first shaft or the first and second shanks.

10. The method according to claim 9, in which the first and second partitions are mounted inside the first or the second shank.

11. The method according to claim 1, in which the well is equipped with at least one casing, inside of which sets one or both of the first and second partitions.

12. The method according to claim 1, wherein when performing completion, or repair of wells provide through the first and second partitions the possibility of well control during installation in the borehole column to completion, under the lower end of which are the first and the second partition that it is installed in the well.

13. The method according to item 12, in which the hole in Tanglewood the control unit operating flow rate for controlling the flow of fluids through the well.

14. The method according to item 12, in which prior to installation in the well column for completion in the wellhead install pipe head.

15. The method according to item 13, in which the control device operating flow rate set the Christmas tree.

16. The method according to clause 15, which sets the horizontal or vertical Christmas tree.

17. The method according to item 12, in which completions upper end of the column for completion fixed in the suspension column and hung for it, and prior to installation on the well control device operational flow wells collect the node that includes the specified device regulation and the suspension of the column, by planting suspension column on the control unit and fix it from there.

18. The method according to 17, wherein said node is installed on the well in a single operation.

19. The method according to item 12, which in the repair finished well out of the control device operating flow rate remove the suspension columns and/or column for completion by ocalenia suspension columns from the control device operational production of the well.

20. The method according to item 12, which in the repair of complete well control unit operational de the ITA wells and a column for completion is removed in the form of a single node.

21. System dual partitions for use in conservation, completion, or repair of wells containing the first and second partitions placed in the wellbore at a distance from each other to form between them a space, a means of measuring pressure for generating a signal characterizing the pressure in the space between the first and second partitions, means receiving the pressure signal generated by means of pressure measurement, and a means of transmission of the signal from the pressure measuring means receiving the signal pressure.

22. The system according to item 21, in which the means of measuring pressure is the gauge.

23. The system according to item 21, in which one or both of the first and second partitions is selected from the following group: cement tube, unperforated liner, unperforated section of the casing, the valve head of the shank, a hollow packer, insulating cover, an expanding packer, drop cap, rupture disk or hydraulic packer-tube.

24. The system according to item 21, in which one or both of the first and second walls includes a combination of a physical device, means fixing and sealing means.

25. The system of paragraph 24, in which the sealing means is selected from the following groups: ball valve, butterfly valve, a sliding coupling which, a pressure seal cyclic steps, removable cable tube rupture disk, the tool zonal isolation, knife and/or opened by the pressure of the tool.

26. The system of paragraph 24, in which the sealing means is placed at a distance from the specified physical device.

27. The system according to item 21, further containing installed in the borehole suspension of the first shank or suspension of the first and second shanks, and one or both of the first and second baffles are located inside the suspension first or the second shank.

28. The system according to item 21, further containing installed in the bore of the first shaft or the first and second shanks, and one or both of the first and second partitions are located within the first or the second shank.

29. The system according to item 21, further containing at least one installed in the well casing, within which one or both of the first and second partitions.

30. The method of installation of wellhead equipment for underwater wellhead, in which a string of pipe connected to surface valves above the surface of the water and put the tree on a submerged wellhead, while maintaining control of the well by at least two independently verifiable deep-set partitions to implement the Oia of well control.

31. The method according to item 30, in which when connecting the tubing from the wellhead valves are installed on the upper connection of the tubing hanger columns and fix it to the wellhead.

32. The method according to item 30, in which descend the tree, the suspension of the column and the column of pipes through open water to the well, extending from the mouth underwater.

33. The method according to p, in which the descent of x-Mas tree, suspension column and the column of pipes carried out without blowout preventer.

34. The method according to item 30, in which when connecting the tubing to the fountain valves install suspension of pipes on the upper connection pipe string, fix the suspension tubes for tubular head and attach the tube head to the wellhead.

35. The method of installation of wellhead equipment for underwater wellhead, which connect over the surface of the water column pipes and the suspension of the column, the lower suspension column on underwater wellhead, and put on it the wellhead Christmas tree, while maintaining control of the well by at least two independently verifiable deep-set partitions for the implementation of well control.

36. The method according to p, which record the suspension of the column at the wellhead.

37. The method according to p, in which the suspension column fix the shape at the wellhead.

38. The method according to p, in which the suspension columns put on an underwater wellhead through the tubing head and fix the suspension column on the tube head.

39. Method of completion subsea wells using horizontal x-Mas tree for regulating the operational flow rate of the well, namely, that collect above the water surface site, installing and suspending the upper end of the column for completion in the suspension column, on the horizontal x-Mas tree and put the assembled host to an underwater well, and when during Assembly of the specified node of the suspension column and a horizontal x-Mas tree above the water surface provide well control through at least two independently verifiable deep-set partitions for the implementation of well control.

40. The method according to 39, which when assembling the specified node are planting suspension column in the case of x-Mas tree and fixing the suspension on it.

41. The method 40, which verify the integrity of the collected node when its above the surface.

42. The method according to paragraph 41, where validation to validate the hydraulic and electrical coupling places the suspension of the column with the case of x-Mas tree.

43. The method according to paragraph 41, where validation to validate the tightness of the node.

44. The method according to 39, in which when the shutter unit to the wellhead using the module lower part of the riser column.



 

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Test plug // 2361061

FIELD: oil and gas industry.

SUBSTANCE: invention refers to oil and gas industry and is designed for testing boreholes for pressure. Facility for a crushed plug consists of a pipe, in the section of which, in a designed for the plug chamber, there is assembled the plug. The plug contains several round glass disk elements of specified thickness arranged in layers one above the other. The plug in combination with sealing elements tightly closes the passage through the pipe, when a lower side of the plug is installed in the seat of the chamber. Film or sheet of any other, than glass, material is laid between various layers of the plug. The invention facilitates increasing test pressure and withstanding rapid fluctuations of temperature and load.

EFFECT: increasing test pressure and withstanding rapid fluctuations of temperature and load.

20 cl, 3 dwg

FIELD: oil and gas industry.

SUBSTANCE: facility refers to oil and gas industry. It is designed for disconnection of producing horizons and for sealing of circular space in interval of upper pipes of liner. The facility consists of a shaft with radial channels made in its walls. A piston designed to perform axial displacements is fixed on the shaft by means of a shear screw. Under the piston there is arranged an expanding cone and a seal containing collars resting on a lower sub, the upper end if which is made in form of a circular projection forming a shell, while on external side surface of the sub there are made lugs, which form centralisers. The invention facilitates preventing break of seal collars, and also preventing possibility of warp of axis of the facility relative to axis of the well due to improved design of the lower sub.

EFFECT: preventing break of seal collars, and also preventing possibility of warp of axis of facility relative to axis of well due to improved design of lower sub.

3 dwg

Packer // 2358089

FIELD: mining.

SUBSTANCE: packer consists of trunk with shaped slot, of centraliser, of self-sealing collar, of sealing element and of cone. A fixture with a guiding pin is assembled on the trunk below the cone; the fixture is intended to axial displacement. The fixture is equipped with oval sockets around circumference; the sockets are spring loaded internally in radial direction by means of springs and they interact with the cone during operation. A rod, capped from the top and connected below with the trunk, is screwed into the upper end of the trunk. At the top the rod is connected with a load equipped with a chamber in the lower part. The rod has radial openings and fingers located above the openings, while the load has lengthwise pass-through grooves for fingers of the rod. The lower part of the chamber is designed to shut off pressure tight radial openings of the rod, when the load goes down. Two axial short sections of the shaped slot are closed between them so, that the pin is situated within boundaries of the short axial sections - transport position - at axial reciprocal movement of the fixture relative to the trunk at length equal or exceeding length L of the short axial sections. When the fixture goes down relative to the trunk at a distance less, than length L of the short sections of axial parts and at following travel of fixture up, the pin goes to a longer axial section of the shaped slot, directed upward and set off along perimetre relative to the short axial sections - working position. Also the pin travels from working into transport position, when the fixture goes down relative to the trunk at a distance exceeding or equal to length - B of the shaped slot.

EFFECT: increased efficiency at multiple pressurising of production string due to possibility to shut off radial openings of rod pressure tight from outside.

2 dwg

FIELD: mining.

SUBSTANCE: released bidirectional packer on cable includes setting tool on cable, stationary bushing with main seat and movable central rod, which is equipped with main stay nut and valve interacting with main seat, movable bushing, two opposing cones, screw-threaded dies connected between them in axial direction and designed to interact with corresponding cones, packer collar and boss made to interact with extraction unit. The stationary bushing is equipped in its middle part with a lengthwise groove, while its ends are equipped with main and additional seats and with upper and lower stops with bypass channels. Also the packer collar is made in form of an upper self-packing collar, is able to travel bottom-up and is located between the upper cone and the upper stop. A lower self-packing collar is situated between the lower cone and lower stop; this collar is able to travel downright; the movable bushing is set on the stationary bushing, it is equipped with a pin inserted into the lengthwise groove of the stationary bushing. Further screw-threaded dies are arranged on the movable bushing, are pressed inwards with spring rings and each of them is equipped with centralisers pressed outward. The central rod is equipped with upper and lower circular grove with the additional stay nut and the valve. The main and additional valves are assembled in corresponding upper and lower grooves and are able to limited displacement between the corresponding stops and interior edges of the corresponding circular grooves; also the valves are pressed from the stops to corresponding main and additional seats. The main and additional stay nuts are arranged at a uniform distance from the pin of the movable bushing and are able to interact with the pin; the boss is rigidly connected to the top of the central rod and is made in form of a cone tapered at the top, on the interior surface of which there is made a closed shaped slot with a groove connecting it with the upper edge of the boss. The setting tool is made in form of a branch with a pin inserted into the shaped slot, which is made so, that at reciprocal movement of the setting tool relative to the boss for the length exceeding the height of the shaped slot, the pin will be located within the limits of the shaped slot; if the length is less, then the pin will go into the groove of the shaped slot at travel upward.

EFFECT: simplification of packer design eliminating implementation of electric engine with cable and facilitating setting and disruption of packer in specified interval of well without special devices.

2 dwg

FIELD: mining.

SUBSTANCE: released bidirectional packer on cable includes setting tool on cable, stationary bushing with main seat and movable central rod equipped with main stay nut and valve interacting with main seat, movable bushing, two opposing cones, screw-threaded dies connected to each other axially and designed to interact with corresponding cones, packer collar, and boss made to interact with extracting unit. The stationary bushing is equipped in its middle part with a lengthwise groove, while at the ends it is equipped with the main and additional seats and with upper and lower stops with bypass channels. Also the packer collar is made in form of an upper self-packing collar allowing bottom-up travel and located between the upper cone and upper stop. A lower self-packing collar is situated between the lower cone and lower stop; this lower self-packing collar travels downright; the movable bushing is located on the stationary bushing and is equipped with a pin inserted into the lengthwise groove of the stationary bushing. The screw-threaded dies are assembled on the movable bushing and are pressed inside with spring rings; the dies are equipped with centralisers, spring loaded outwards. Further the central rod is equipped with upper and lower circular grooves, with additional stay nut and valve; the main and additional valves are placed in corresponding upper and lower grooves and are able to pressure tight limited travel between the corresponding stops and internal edges of corresponding circular grooves; they are pressed from the stops to corresponding main and additional seats. The main and additional stay nuts are arranged at uniform distance from the pin of the movable bushing and interact with the pin. Also the lower stop is equipped with outward spring loaded plates assembled uniformly outside along the perimeter of the lower stop and designed to limited radial movement; the boss is rigidly connected with the top of the central rod. The boss is made in form of the tapered at the top cylinder, on the exterior surface of which there is made a shaped closed slot with a groove connecting the slot with the upper edge of the boss. The setting tool is made in form of a branch with a pin inserted into the shaped slot, which is made so, that at reciprocal movement of the setting tool relative to the boss at the length exceeding the height of the shaped slot the pin will be located within the limits of the shaped slot; if the length is less, then the pin will go into the groove of the shaped slot at travel upward.

EFFECT: simplification of packer design eliminating implementation of electric engine with cable and facilitating setting and disruption of packer in specified interval of well without special devices.

2 dwg

Packer // 2347062

FIELD: oil and gas industry.

SUBSTANCE: invention refers to mechanical engineering and can be used for oil and gas production. Packer includes body, rod, upper and lower switchers, in-body cup and hydraulic cylinder. There is an annular space provided between hydraulic cylinder and rod, and containing a piston. The annular space cavity above the piston is connected to producing string column through the hole formed in the rod. The hydraulic chamber is formed with the hydraulic cylinder and the rod and filled with liquid. Between hydraulic chamber and annular space in the hydraulic cylinder, there is a packing sleeve with a slot used to connect cavity of the hydraulic chamber to the annular space cavity. The slot is stopped with valve arranged in the annular space below the packing sleeve. The valve is supported on the piston mounted below in the annular space and fixed in its initial upper position relative to the hydraulic cylinder with shear screws. The sealing cup is provided on the body between upper and lower protective collars. The upper protective collar is supported on upper switch, and the lower protective collar rests on the hydraulic cylinder through retainer num in-between.

EFFECT: higher downhole performance especially that of several beds with selective processing using number of packers.

1 dwg

Plug packer // 2346142

FIELD: oil and gas industry.

SUBSTANCE: invention refers to oil industry, and is intended for temporary covering of well shaft. Plug packer consists of a mandrel with internal cylindrical mining device; on external side of mandrel installed is a sealing element with a stop. Above the latter there is a thrust bush, and between it and the stop - retaining ring with notches. On the mandrel opposite the stop there provided are annular notches with the direction opposite to the ring notches. Below sealing element there located is the main cone with main sockets, locking ring, and additional cone with additional sockets. Main sockets and additional sockets are connected to the main cone and additional cone respectively by means of a dovetailed joint, and to the locking ring edges - by means of T-joint. Mandrel is equipped with stops located along the perimeter and at one and the same level between additional sockets with the possibility of passing through openings provided in locking ring, and interconnected to the main cone when in operating position. Inside the mandrel there telescopically installed is a detachable joint made in the form of a branch pipe with external cylindrical mining device in upper part. In lower part of the mandrel there are radial holes located wherein fixing balls are installed. Plug is made in the form of a blind transverse partition installed inside the mandrel, and a hollow bush rigidly attached to additional cone from the outside. Blind transverse partition and mandrel can be made as one solid part. Balls are interconnected on the one side to detachable joint, and on the other one - to hollow bush. By means of shear elements, the mandrel is connected to detachable joint and main cone. On the stop from above there is a casing of setting tool rested. Detachable joint is plugged from above, and setting tool rod is made hollow, and connected to mandrel by means of a breaking element. From below, the hollow cylinder is borne against the hollow transverse partition downwards by means of a spring, which is located inside on the lower end of the mandrel, at that spring is in a compressed position. Mandrel below hollow transverse partition is equipped with a vertical through slot wherein installed is a pin with the possibility of axial movement. On one side, pin is rigidly connected to additional cone, and on the other one - to spring-loaded hollow cylinder. Sealing element is made in the form of barrel-shaped seals separated from each other with a support ring.

EFFECT: saving of time required for removal, avoiding unnecessary lowering and raising operations, as well as guaranteed removal of plug packer out of the well.

3 dwg

Drillable packer // 2344270

FIELD: oil and gas industry.

SUBSTANCE: invention is related to oil and gas production industry and is intended for overlapping of intertubular space and performance of isolating works in case of wells overhaul. Drillable packer contains shaft with notches on external surface, the following components installed on shaft - combined sealing element, extrusion washers, upper and lower rupture screw-thread dies, movable upper and fixed lower supports, fixator in the form of split spring rings in annular bore of movable support. Packer shaft is equipped by left sub with calibrated annular bore and nipple in axial channel, which is rigidly connected to left sub and equipped with fitting valve in axial channel in the form of sleeve with dead bottom and radial holes covered with bushing equipped with throttle. Bushing is connected to sleeve by calibrated shear element. Bottom support is equipped with spring-loaded check valve in the form of body with plug in middle part and radial holes, elastic sealing collar at the lower end, installed with the possibility of interaction with seat in axial channel of lower support.

EFFECT: increase of intertubular space sealing reliability, and also increase of fitting tool functional resources by its multiple usage.

3 cl, 4 dwg

FIELD: oil-producing industry.

SUBSTANCE: invention is related to oil-producing industry, namely to method of packering in operation and development of oil wells. Packer contains hollow shaft with the main sealing element and multifunctional channel installed in the shaft and filled with filler, where at least one cable and one control instrument are located. Packer is equipped with additional sealing element, which is installed on the hollow shaft at the preset distance from the main sealing element with formation of circulation chamber between them after packer installation in intertubular space, the chamber communicates by means of control instrument installed in multifunctional channel with subpacker zone, and at least one relief valve/controller, which is installed under the main sealing element and accordingly installed in the transverse channel, arranged in the hollow shaft, or at least in one well chamber installed under the main sealing element. The external diameter of hollow shaft between the sealing elements does not exceed the diameter of sealing elements. Control instrument, which is installed in multifunctional channel, is installed in its bottom part. Circulating chamber is installed with the possibility of communication with internal cavity of hollow shaft by means of relief valve/controller. It provides increase of packer operation efficiency during pump operation of wells.

EFFECT: increase of packer operation efficiency in pump operation of wells.

5 cl, 2 dwg, 1 ex

FIELD: mining.

SUBSTANCE: invention concerns geophysical methods of well investigation and can be applied in well bore zone sealing during logging research. The device comprises a transformable frame holding a fluid-stopping unit. This unit includes a fiber layer made of organic or natural polymers and/or fiber glass. Additionally the device includes fiber a collecting unit made of permeable fabric, net or perforated material. Also the case holds a spring or umbrella unit implementing case expansion in a borehole. The case is made of materials at least poorly soluble in oil well fluid.

EFFECT: streamlining of technology packer placement in a well.

17 cl

The invention relates to the development of underwater mineral deposits in the Arctic, mainly liquid and gas, the installation of subsea technological systems that ensure the carrying out of works by the method of cluster drilling regardless of weather conditions and the presence of ice cover

The invention relates to a system for offshore production of oil or gas containing vessel with means for maintaining the desired position and orientation, the bottom installation on the seabed for at least two production wells and product pipelines to connect the bottom of the installation vessel

The invention relates to the oil and gas industry and can be used while drilling oil and gas wells on land and offshore wells from surface mouth

The invention relates to the development of underwater mineral deposits in the Arctic, mostly liquid and gaseous, and in particular to underwater construction of technological systems, which ensure the carrying out of works by the method of cluster drilling regardless of weather conditions and the presence of ice cover

The invention relates to the oil and gas industry, in particular to methods of connection waterproof casing wellhead subsea wells

The invention relates to the oil industry, in particular to devices for retrieving equipment from the mouth of oil wells

FIELD: oils and gas production.

SUBSTANCE: group of inventions refers to methods and facilities for conservation, completion and repair of wells. The inventions facilitate control over the well during the said operations by means of assembling system of two partitions in well. Each of the partitions is located below the lower end of a flow string for well completion, when this string is installed into the well. As none of these partitions is installed higher in the borehole of the well, so both partitions rest in place during operations of conservation, completion and repair, which eliminates necessity to use a block of blowout preventers to facilitate reliable control over the well.

EFFECT: reduced cost of well construction due to reduced time required for operation of drilling rig.

44 cl, 23 dwg

FIELD: oil and gas industry.

SUBSTANCE: device includes housing, liquid working chamber for working fluid, piston barrel installed in the housing in movable manner, working gas chamber for gas under pressure and movement of piston barrel with displacement of working fluid from liquid working chamber, as well as additional working chamber for gas under low pressure. At that, piston barrel includes cavity for gas under pressure, which is hydraulically interconnected with gas working chamber. At that, gas chamber is separated from low pressure chamber with a piston. Method involves storage stages of working fluid in the device and movement of piston barrel for supply of working fluid from liquid working chamber to underwater equipment to control the operation of blowout preventer.

EFFECT: providing pressure compensation system in pressure accumulators at sea bottoms.

24 cl, 20 dwg

FIELD: oil and gas production.

SUBSTANCE: invention comprises a floating platform, equipped with weight-lifting devices, a "skirt" in the form of a truncated cone with expansion towards sea bottom, walls of which are made of fabric. A cover is suspended to the platform at the bottom, having negative buoyancy, which is tightly connected to the "skirt", at the same time the fabric is soft and impermeable for oil products and is fixed to rings of the frame, having positive buoyancy, arranged horizontally with a certain pitch. Rings jointly with the fabric fixed to them separate the inner cavity of the "skirt" from sea water outside the "skirt" walls. The upper ring of the frame jointly with the fabric top is rigidly and tightly fixed to the cover, and the lower ring of the frame is joined with sinkers and connected by ropes to hoists so that for transportation the "skirt" may be folded as "bellows".

EFFECT: autonomous and mobile structure, possibility to confine leaked oil products in a closed water volume with their subsequent pumping.

2 dwg

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