Method and device for continuous circulation of drilling fluid during construction and operation of well

FIELD: oil and gas industry.

SUBSTANCE: method consists in movement of a housing of a continuous circulation tool to an adapter having a channel passing through it and intended for connection in a pipe string in the well and selective movement of drilling fluid between the housing and a side hole in the adapter; in addition, the continuous circulation tool includes a shutoff device, and actuation of a shutoff mechanism to introduce a shutoff element of the shutoff device through the side hole in the adapter for insulation of drilling fluid flow through at least one section of the channel. A system for carrying out well operations with continuous circulation of drilling fluid, which contains a continuous circulation tool interconnected with a tubular column of the well, which contains an adapter and is intended for selective shutoff of the drilling fluid flow to tubular column of the well, a pipe manipulating device near the adapter, which contains the following: a pipe wrench, pipe wrenches, a pipe wrench, a retaining wrench, a pipe wrench and a spinning wrench and a device for mechanised suspension and unscrewing of pipes.

EFFECT: maximum drilling speed.

34 cl, 27 dwg

 

The present invention relates to a method and apparatus to facilitate continuous circulation of drilling mud during construction and maintenance of wells, preferably, but not exclusively, to an oil or gas well. The present invention also relates to a system for conducting well operations with a continuous circulation of drilling mud.

When the construction of an oil or gas well drilling the wellbore. Drill bit is placed on the end of the drill string and rotated to drill the borehole. Drilling fluid environment, known as "drilling mud", is pumped through the drill string at the drill bit to lubricate the drill bit. Drilling mud is also used for the removal of drill cuttings generated by the drilling bit, and other solid impurities to the surface through the annular space formed between the drillstring and the borehole and/or casing tube, oblitsovyvaemoy the wellbore. The drillstring is usually made of multiple sections of drill pipe, threaded.

In one known method of drilling a wellbore using the drilling rig uses a conducting rod having a square or other multilateral cross-section, connected with the main section of the drill string, which is used to rotate the drill is through the column. Drilling the rotor at the level of the floor of the drilling rig rotates a lead rod, which at the same time are able to move vertically through the guide insert in the drill rotor on the floor of the rig. In another known method drilling rig with top drive is suspended in the clamping fixtures rig and rotates the drill string, and a leading rod is not used. It is important to control the pressure in the wellbore relative to the pressure in the reservoir. In some circumstances, the operator may assume that the required drilling under reduced hydrostatic pressure in the wellbore at which the pressure applied to the formation exposed to the wellbore below the pressure of the drilling fluid in this reservoir. Thus, in the presence of sufficient porosity and permeability of the mud layer penetrates into the well. Drilling speed usually increases, when there is a condition of drilling under reduced hydrostatic pressure in the wellbore. However, the driller may assume that the required drilling at elevated hydrostatic pressure in the wellbore at which the pressure in the borehole exceeds the pressure of the drilling fluid in the reservoir. This excess pressure is required, inter alia, to prevent the ingress of reservoir drilling fluids (is Efti, gas or water) into the well. However, excessive hydrostatic pressure can dramatically slow the drilling process, strengthening the breed next to the well and limiting the removal of drill cuttings under the bit. In addition, the high elevated hydrostatic pressure in combination with low mud can cause problems sticking under the action of pressure difference. Because reservoir pressure will vary from one reservoir to another at a relatively constant density of the drilling fluid, increased hydrostatic pressure varies from one zone to another. The driller may modify the terms of drilling from low hydrostatic pressure up to high hydrostatic pressure in the wellbore by changing the density of the drilling fluid, using weights to increase or decrease the density of the mud.

Without proper control well pressure cannot be ensured maximum drilling speed. In the worst-case scenario, the borehole may collapse due to insufficient pressure in the wellbore. This is more likely when drilling certain types of formations.

Before the circulation of the drilling fluid was stopped during the screwing or unscrewing a single connection or spark drill pipe. Filling valve or shut-off Klah is an for drilling mud is used to contain the pressure in the drill string during the procedure screwing or unscrewing. However, this valve need to connect and disconnect. Thus, there is an intermittent circulation, and although the pressure being maintained in the well, there is a pulse pressure variation. Circulation of drilling fluids can be very critical to maintain a stable pressure in the descending well and stable and nearly constant equivalent density circulation. When the drill string is lowered into the hole or raised from the well, the lack of continuous circulation of the drilling fluid can cause pressure changes in the borehole, which increase the likelihood of unwanted emissions". The connection sections of the casing in the well cause similar problems with the circulation of drilling fluids.

It is often preferable to maintain the cuttings suspended in drilling fluid to facilitate its removal from the drill bit and prevent it from passing back into the well. The termination of circulation of the drilling fluid can lead to the deposition of drill cuttings. To prevent this, in many known systems have attempted additional weight of the drilling fluid, often increasing its viscosity. This leads to the need for greater capacity of the pump at the surface to move more thick mud, but that is the first increase in the pump power can lead to increased pressure in the borehole, which can cause formation damage or loss of drilling mud.

Developed a system of continuous circulation, described in PCT publication no WO 98/16716, which allows the circulation of drilling fluid during the screwing of the pipe and unscrewing the pipe from the pipe string. Publication WO 98/16716 describes, among other things, the use of the upper set of pipe dies for the application and sealing around one or candles pipes, which must be connected with the column below set pipe dies for the application and compaction around the pipe in the upper part of the column in the well to form between them a chamber, and a hollow die to seal the chamber between the end pin tubes, intended for the connection and the socket pipe in the upper part of the column for the education of the upper and lower chambers. Inlet for the drilling mud is located in the lower chamber between the set of blind spots and the lower pipe kit dice. Supply of drilling mud is also connected with the upper end of the pipe, intended for connection to thereby form a connection, and the lower pipe dies are driven and seal around the upper end of the column pipe in the well, and deaf dies are driven and compact for the education of the lower chamber around the upper cha the tee drill string. The drilling fluid can move into the lower chamber and to circulate in the upper part of the drill string. The drilling fluid passes through the drill string at the drill bit and the borehole and returns through the annular space formed by the drillstring and the wellbore. The drilling fluid is processed through vibrating sieves are cleaned on a centrifuge and the like for removal of the sludge if necessary add more components and then provide circulation in the lower chamber. One drill pipe or string of drill pipe is lowered into the upper part of the system of continuous circulation. The upper pipe dies are driven to seal around the pipe. The upper end of one drill pipe or the drill pipe string is attached to a supply of drilling fluid and drilling fluid moves into the upper chamber by actuation of the valve. At the moment the pressure in the upper and lower chambers are essentially the same. Blanking die is opened, and end with an external thread of one or the drill pipe string is introduced into the socket at the upper end of the tubing and twist and turn to form a connection. The drilling fluid in the chamber can be produced, and the upper and lower tube plates open for lowering the drill string with the Addendum is Noah one drill pipe or casing drill pipe into the borehole. Thus, by a continuous circulation through the drill string and the annular space when the connection is fastened and razvertivaetsya.

In the system of continuous circulation made various improvements, including the construction of continuous circulation during drilling. This ensures the continuous rotation of the drill string to continue drilling until one drill pipe or column of drill pipe is connected or disconnected from the column. It is effective for drilling drill pipe or drilling using the casing string.

Published patent application U.S. No. 2003-0221519, published December 4, 2003 (application 382080, filed March 5, 2003), describes a device that allows the pipe sections to connect to or disconnect from the pipe string during drilling operations. This device also provides the rotation and movement of the sections of drill pipe in the axial direction during connection or disconnection. This device also provides a continuous circulation of drilling fluid into and through the tubular column during screwing or unscrewing. This device forms a node of the rig containing the top drive mechanism, the drive mechanism of the rotor and the device of the circulation of drilling mud. Rotation and OS is the first movement of the tubular columns alternately provides a top drive and the drive rotor. In addition, the continuous movement of the drilling fluid in the tubular column is provided through the circulation device and alternately through the tubular section, when there is a connection between the upper pipe connected to the top drive mechanism, and a tubular column. This application also describes a method of connection of the upper tube with the top tube of the tubular columns with continuous drilling, and this method includes the following steps: actuation of the drive rotor to provide rotational and axial movement of the tubular column in the borehole, placing over the top tube of the tubular column upper tube containing the lower threaded end that connects to the upper threaded end of the upper tube, the change in relative speed between the top tube and top tube for the connection by threading the lower threaded end of the upper tube and the upper threaded end of the upper tube so that the upper pipe becomes part of the tubular column, the release of tubular columns from engagement with the drive rotor, the actuation of the top drive to provide rotational and axial movement of the tubular column in the well.

In some known systems that are used for drilling top drive, a column of drill pipe (for example, a column length of 27 m (90 is outow), contains three interrelated parts drill pipe) is connected through the threads and under the safety sub. The safety sub is connected with a part of the drilling rig with a top drive, and when the drilling has progressed down to the length of the candle, the safety sub injected and placed in the camera system, continuous circulation of drilling mud. To add a new candle with this type of known system, razvertivaetsya connection in the system of circulation of the drilling fluid, the drilling rig with a top drive is raised, and at the same time, the safety sub up and out of the upper part of the system of continuous circulation. Then to connect the new the drill pipe string section of the drilling rig with a top drive (e.g., lift) in some known methods is retrieved from the well. The lift is usually associated with a drilling rig with a top drive, however, this lift is often impossible to use for reception and support of a new column, because of the safety sub prevents this operation.

In many cases, when a drilling rig with a top drive is raised, it is desirable to extend the borehole from the bottom up to ensure the circulation of the drilling fluid and the rotation of the column, leaving the trunk (what quaini), when drilling rig with top drive is raised, for example, to smooth out the barrel and to prevent the formation of grooves.

Another problem associated with such drilling systems, is that it is desirable to drill as far as possible with each new column of drill pipe, however, parts and devices (e.g., lifts), suspended under the drilling rig with a top drive, preventing further advancement down the drilling rig with a top drive until they aside from the well axis, so that the drilling rig with a top drive may continue to rotate drill string because of the safety sub drilling rig with top drive included with the system, continuous circulation (and top drive closer to the continuous circulation). Usually lift aside in one direction from the axis of the well (and used lifts prior art, which open in one direction only).

There are many known systems for continuous circulation, for example, but not as a limitation, the following patents and patent application U.S. are exemplary systems and their elements: U.S. patents 7350587, 7107875, 6412554, 6315051, 6591916, 3298385, 1491986 and application for U.S. patent No. 11/449662 filed June 9 2006

There are many famous Pere is Umnikov for wells, systems continuous circulation and corresponding elements, including, for example, U.S. patents 2102555, 2158356, 4310050, 4448267, 4646844, 6253861, 6688394, 6739397, 7028787, 7134489 and 7281582 and publication of applications for U.S. patent No. 2002/0157838, published October 31, 2002, and 2006/0254822, published on 16 November 2006 the above-Mentioned patents and applications are included in full in this description by reference. Various known systems have many disadvantages and problems associated with their use, for example, in some systems of the prior art valves inside the sub, are lowered into the well, where they are susceptible to wear and damage. Many of the details (for example, fishing tool, a logging device, downhole tools, and others), which should be placed in a borehole under sub is limited by the diameter diameter that will pass through the sub. In some aspects, the area of the valve seat of the sub will be of relatively small diameter, which limits the size of parts that can be introduced through the sub.

Devices for mechanical suspension and unscrewing pipes" unite wrench with limit torque and drilling the key to connection and disconnection of pipes, for example, drill elements, for example, drill pipe, moving the tubing in wells and from wells. Device for mechanical suspension and unscrewing pipes of the prior art is shown, for example, in U.S. patents№ 4023449, 4348920, 4765401, 6776070, 7062991, 7188547, 7313986, included in this description in full by reference. Some devices for mechanical suspension and unscrewing pipes in accordance with the prior art contain drill key and wrench with limited torque, mounted together on a single carriage. For screwing or unscrewing the threaded connection between the two pipes, for example compounds of the drill pipe, some devices for mechanical suspension and unscrewing pipes contain wrench with limit torque with two levels of sponges. Top sponge wrench with limit torque is used to clamp the portion of the upper pipe and the lower sponge clamps the area of the lower pipe, for example, the upper and lower elements of drill pipe are connected by threads. After the pipe clamping the upper and lower jaws are rotated relative to each other to Unscrew or screw connection between the upper and lower pipes. Drill key mounted on the carriage above the wrench with limited torque, is engaged with the upper pipe and rotate it up until it is e detaches from the bottom of the pipe (or during the join operation clinivet two pipes together before the final screwing by means of a wrench with limit torque).

Some devices for mechanical suspension and unscrewing pipes installed to move from the centre of wells in the allotted position that does not obstruct or block the execution of other operations related to the well and rotating or driving device. This system of the prior art can be used for screwing and unscrewing of the connection in the main column or to connect to or disconnect from the tubular section, located at a distance from the center of the borehole, for example, in the pit under onetrunk (or pit under the square) on the side surface of the well.

Some known systems mechanical suspension and unscrewing pipes include the carriage for rolling on the floor of the drilling rig along a predetermined trajectory. In some systems of the prior art rotator and wrench with limit torque is set to move up and down relative to the carriage, for proper engagement with the pipe and to rotate between a position in which the axis continues directly vertically for engagement with the pipe from the vertical hole, and a position in which the axis of the spinner and torque wrench with limit torque is at a slight angle to vertical, to enter into a hook which begins to influence the pipe in an inclined pit under onetrunk. In some systems of the prior art rotator is made with possibility of vertical movement relative to the wrench with limited torque.

There are many known wrenches with limited torque and pipe wrenches for use in downhole operations, such as, among others, as described, are included in this description by reference. U.S. patents 3892140, 4221269, 4425827, 4446761, 6684737, 6971283, 5161438, 5159860, 5842390, 5245877, 5259275, 5390568, 4346629, 5044232, 5081888, 5167173, 5207128, 5409280, 5868045, 6966385, 6138529, 4082017, 6082224, 6213216, 6330911, 6668684, 6752044, 6318214 and 6142041, 6253845 and 7000502

In accordance with the present invention created a way to provide continuous circulation of drilling mud during construction and maintenance of wells containing the movement of the body of the instrument for the continuous circulation to the sub with a channel passing through it, and intended for connection in a string of pipe in the well and selective accommodate movements of the drilling fluid between the casing and the side hole in the sub, and the instrument for the continuous circulation further comprises a locking device, and actuating the locking mechanism for the introduction of the locking element of the locking device through the side hole in the sub for isolation of drilling fluid through at the ore, one part of this channel. Preferably, the locking mechanism locates the locking element at an angle to the direction of movement of the drilling fluid through the channel of the sub, and this angle not equal to 90° and preferably is in the range from five to eighty-nine degrees, and preferably in the range from forty-five to eighty-nine degrees. Preferably, the locking element has essentially a flat surface, which prevents the flow of drilling fluid through the channel.

Preferably, the displacement of drilling mud in the borehole is directed from the housing by the locking element. Preferably, the locking device includes a channel for directing drilling fluid through the shut-off element in or out of the channel of the sub. The drilling fluid in the channel above the shut-off element can be produced through the channel and return to an active recovery system mud or processed before returning to the active system recovery solution to remove solids and other contaminants.

Preferably, the method also includes the step of removal of the insert from the side holes before the introduction of the locking element through the side hole. Preferably, the step of removing the stub runs through the introduction of spacers in the spacer DL which facilitate the removal of the stub. Preferably, the spacer is introduced between at least two elements for their separation, to ensure removal of the insert from the side holes. Preferably, the sub further comprises two spaced recesses lateral openings provided with a side opening, and a mechanism for fastening comprising one or two dogs, each of which has a capability for selective movement into or out of one of the two spaced grooves the side holes. Preferably, this method further includes the step of actuating the device to move the plugs to remove and return to place. Preferably, this method further includes the steps of removal of the locking element from the channel through the side hole and return to the place of the stub. Preferably, the sub is a column of pipe, such as drill pipe. Preferably, when the cover replaced, the sub moves down through the hole in the column pipe.

Preferably, the locking mechanism includes at least one selectively extendable member. Preferably, the locking mechanism includes a sliding element with the drive. Preferably, the sliding element with the actuator is at least one of: piston with a hydraulic actuator and cylinder, piston with pneumat the economic drive and cylinder, the rack with a pinion linear actuator. Preferably, the sliding element includes first and second end, and a sliding element with a drive contains a proximal and distal end, the first end contains a shut-off element, the second end is attached can be moved to the distal end and the proximal end attached to the body. Preferably, the proximal end of the retractable element with the actuator attached to the body on the pin, and a sliding element configured to move on the pin. Alternatively can be used ball swivel. Preferably, at least part of the sliding element is located inside the instrument for the continuous circulation and part of it outside the case. Preferably, the sliding element passes through the housing in the rotary seal. Preferably, the sliding element with the actuator is located outside the case.

Preferably, the sub contains the ledge, and the method includes the preload locking element to the ledge. Preferably, between the locking element and the protrusion is formed seal. Preferably, the channel includes a section having an increased diameter, in the area adjacent to the side opening, and a protrusion formed a transitional zone between the mentioned Uch is tough and channel.

Preferably, the instrument for the continuous circulation is located on the console to facilitate its movement to or from the sub. Preferably, the other end of the console is planted on a rack connected with the floor of the drilling rig.

Preferably, the device for manipulating pipe is located above the continuous circulation device, and the method includes the step of using the device for manipulating pipes to facilitate connection of the sub with the pipe, preferably, a single pipe or column of two, three or more tubes. Pipes may be drill pipe, pipe tool, casing pipe, the inner pipe, the first pipe or any tool or downhole tool for connection with the column pipe. Preferably, the device for manipulating pipes placed on the console. Preferably, the instrument for the continuous circulation moves in conjunction with the device of the pipe wrench. Preferably, the device for manipulating pipes is at least one of: a drive pipe wrench, locking wrench rotator for pipes, drilling key device for mechanical suspension and unscrewing pipes.

The present invention also provides a device for implementing the method according to this invention, containing a sub for the connection is placed in the string of pipe and tools of continuous circulation, the sub includes a housing containing a channel passing through it, and a side hole instrument for the continuous circulation includes a housing provided with a side opening, and a locking device that contains the locking mechanism and the locking element is made with the possibility of selective introduction and removal of the side holes for selective isolation of flow of drilling fluid through at least one section of the channel.

The preferred characteristics of the device set out in paragraphs 19 to 32 and above for implementing the method of the present invention.

The present invention also provides a system for downhole operations with continuous circulation, containing instrument for the continuous circulation communicated with the column pipe wells containing sub that is designed to selectively shut off the flow of drilling fluid into the string of pipe wells, a device for manipulating pipes near the sub, containing one of: pipe wrench, pipe wrenches, pipe wrench and holding the key, pipe wrench and drill key and device for mechanical suspension and unscrewing pipes. Preferably, the sub contains a side opening. Preferably, the instrument for the continuous circulation placed on the console.

The present invention in various aspects of opisyvaetsia, which includes a device for manipulating pipes (for example, pipe wrench, or pipe wrench, pipe wrench and holding the wrench, pipe wrench and rotator or device for mechanical suspension and unscrewing pipes) and device for continuous circulation. In some such systems, the continuous circulation device installed under the device for mechanical suspension and unscrewing pipes and made with the possibility of extension with him towards the device for manipulating pipes, for example, to or from the pipe or pipe string and/or to and from the centre of the well.

The sub provides continuous circulation of drilling mud, and the instrument provides continuous circulation of selective opening of the side holes of the sub and selective prevention of the flow of drilling fluid from the upper part of the sub in and through the sub, while the drilling fluid can move from the wall of the sub down in the column of pipes under sub; and any such system and method are used with a device for manipulating pipes, for example, among others, a pipe wrench, pipe wrenches, pipe wrench and holding the key tubular key and rotator or device for mechanical suspension and unscrewing pipes.

For a better understanding of this image is to be placed below, reference is made, as an example, to the accompanying drawings showing the following :

Figa is a perspective view of the device in accordance with the present invention, containing the sub and tools continuous circulation.

FIGU is a side view with the section of the device shown in figa.

Figa is a top view in section of the device shown in figa, the first stage of the work.

Figv is an enlarged view of part of the device at the stage shown in figa.

Figa is a top view in section of the device shown in figa, the second stage of the operation.

Figv is an enlarged view of part of the device at the stage shown in figa.

Figs is a view in section of part of the sub shown in figa.

Fig.3D is a view in section of part of the sub shown in figa.

Figa is a top view in section of the device shown in figa, at the third stage.

Figv is an enlarged view of part of the device at the stage shown in figa.

Figure 5 is a side view in section of the device shown in figa, in the fourth stage of the operation.

6 is a side view in section of the device shown in figa, on the fifth stage of the work

Fig.7 is a side view in section of the device shown in figa, on the fifth stage.

Fig is a side view in section of the device shown in figa, on the sixth stage of the work.

Fig.9 is a side view in section of the device shown in figa, at the seventh stage of the operation.

Figure 10 is an enlarged portion of the device at the stage shown in Fig.9.

Figa is a view in section of the parts shown in figure 10, with the fixed locking element.

Figa is a side view illustrating the device in accordance with the present invention, this device comprises a device for mechanical suspension and unscrewing pipes.

FIGU is a side view, depicting the device shown in figa, in its extended position.

Figs is a perspective view of the device shown in figv.

Fig.11D is a perspective view of the device shown in figv, with the remote device for mechanical suspension and unscrewing pipes.

Figa is a schematic top view of the device in accordance with the present invention in nevidimom "original" position.

FIGU is a top view showing the first step in the method used is the device, shown in figa.

Figs is a top view showing the second step in the method of using the device shown in figa.

Fig.12D is a top view showing the third step in the method of using the device shown in figa.

Figa is a perspective view of the device shown in figa, the first stage of the work.

FIGU is a perspective view of the device shown in figa, the second stage of the operation.

Figa and 1B depict a device 1 for continuous circulation of drilling mud in the borehole containing the sub 10 and the tool 100 continuous circulation. The transmission 10 includes a housing 12 with a channel 14 to flow from top to bottom, the end 16 with an external thread and the end 18 with internal thread. The sub 10 is connected with the column TS tubes (figv schematically shows part of the TS1 and TS2; for example, the column of drill pipe, drilling rig or platform, continuing down into the ground). The tool 100 continuous circulation includes a housing 102.

The cover 20 is fixed with the possibility of removal in the hole 13 of the housing 12 of the sub 10. When the device 20 plugs secured in place, it prevents movement of the drilling fluid through the opening 13 (for example, see FIGU, 2B, 3B). The device 15 to move the stub (until the data schematically in figa, 1B) selectively actuates and moves the device 20 of the stub. System 17 of the control device 20 of the stub and shut-off device 40 (described below). System 17 control some aspects focused on the type of controls used for this system; for example, and not as a limitation, the control system may include: a management tool for system hydraulic valve with manual control, which actuates a device 20 of the stub and shut-off device 40, an electro-hydraulic control system and mechanical system control. In some aspects, the control system can use the linear displacement device (hydraulic, pneumatic, electric), which act on the locking device 40 and the device 20 plugs and other elements of the system. These devices can operate with manual control and/or through the computer system. Any such control system may include one or more computers, programmable logic controllers (PLC) and/or a separate single-Board computers.

As shown in figv and 2A, the device 15 to move the stub moves the spacer structure 19 to and from the device 20 of the stub. The spacer structure 19 includes a housing 19a and the spacer 19b with the end of 19s.

<> The device 20 of the plugs includes a plug 21 with a concave section 21A of the housing, which does not contain a part which protrudes into the channel 14 (it can be advanced from the inner surface of the channel flush with it). Seal 22 (made for example of rubber or any suitable material seal) seal the surface of the contact hole 13 with the device 20 of the stub. Steel device 23 to prevent eviction is located on each side of the seal and helps to keep the seal in place when they applied pressure. The pressure of the drilling fluid, pressing the stopper 21, the pressure on the steel device 23, which in turn put pressure on the seals 22, reinforcing the seal on the surface of the contact hole 13 with the device 20 of the stub. In one aspect, the outer surface of the stub 21 is flush with the inner surface of the channel (i.e. the curvature of the outer surface of the stub corresponds to the curvature of the inner surface of the channel).

Two spaced locking pawl 24 is arranged to move in or out of the respective grooves 13A side holes. When dogs 24 in the grooves 13A device 20 plugs secured in place. The tap dogs 24 of the grooves 13A, using the device 25 to move the dog releases the device 20 of the stub so that it can be is removed from the slot 13 (as figa, 4B, 5).

The cap 21 includes outer part a and item 21b channel 21r, through which can pass the spacer 19b. Fixing pins s hold components stub together.

The locking device 40 includes locking structure 42, described in detail below.

As shown in figa and 4B, the spacer structure 19 is advanced so that the spacer 19b with the tip 19s actuates the device 25 to move the dogs, the discharge pawls 24 of the grooves 13A. The spacer structure 19 is arranged to move relative to the device 20 of the stub. When the device 20 stub released from the housing 12 of the sub 10 continuous circulation device 15 to move the stub can remove the device 20 of the insert from the hole 13, as shown in figure 5.

As shown in Fig.6, the device 20 of the stub is rotated from the hole 13 through the device 15 to move the stub and, as shown in Fig.7, the device 20 stub rotated in the direction of the holes 13, for example, approximately ninety degrees from its position shown in figure 5 and given in such a way that part of it is in the chamber 102A of the housing 102 of the system 100 continuous circulation. After removal of the device 20 of the insert from the hole 13 (for example, see figure 5) drilling fluid can move through the opening 13 into the channel 14 of the housing 12 is of prevodnik 10 continuous circulation.

Hole 13 provides access to the channel 14 so that the locking structure 42 can be moved into position to block the flow through the channel 14. As shown in Fig, the locking device 40 is powered off and moved the axle 41 (retractable axle, for example a telescopic axle or other sliding axis) towards the hole 13 so that the locking structure 42 passes through the opening 13. The piston 43 of the node 44 of the piston and cylinder is given to carry out this movement axis 41. The axle 41 is moved in the channel 44a of the housing 44. Channel 44a communicates with the internal portion of the shell 102. The contact surface axis 41 with the housing 44 are sealed with seals 45, and the end of the 44th housing 44 secured with seals in the seal 45 in the hole 102b of the housing 102. The end e axis 41 is attached to the swivel element 46, which is connected to rotate with the end 44g node 44 of the piston and cylinder. The other end 44f of the node 44 of the piston and cylinder is connected to rotate with the housing 102. Shut-off structure 42 is attached or made as one piece with the axis 41 to rotate together with it. The mechanism 49 rotate, schematically shown in figv, rotates the locking device 42 by means of the rotation axis 41 of the locking device 42.

As shown in Fig.9, the locking device 42 is rotated and the piston and cylinder 44 is allocated to re ESAT locking device 42 along the inner wall of the channel 14t, to secure it to the ledge 12s the housing 12 of the sub 10. During this phase the axis 41 slightly changes the angle, which provides a sliding seal 45.

Within the scope of the present invention axis 41 (and its parts or elements) must be continuous, so that the displacement of drilling mud through the axis 41 was impossible. Optionally, the axis 41 contains the channel 41r passing through it from one end to the other; the opening 41t upper end and through the opening 46p in the swivel element 46 and line 51, reported on the drilling fluid with the system 50 of the reservoir or supply system of the drilling fluid (such as, for example, the recovery system of the drilling fluid, figa). The valve device 52 is selectively controls flow in the line 51. Valve device 52 may be controlled by any suitable control system, including, among others, the system 17 controls. Any drilling fluid, such as drilling fluid, which enters the upper part of the sub 10 continuous circulation is produced in the tank 50.

To seal shut-off device 42 to the ledge 12s housing 12 sub 10 continuous circulation may be used any suitable seal or sealing device. Optionally, as shown in figures 9 and 10 may be used in the sealing device 54, which is driven under pressure,which includes a sealing element 56 (done, for example, of rubber or any suitable sealing material), on top of which is a solid element 57 (for example, made of metal, steel, hard plastic, composite materials and others). The pressure of the drilling mud solid element 57 presses and thereby actuates the sealing element 56. The retaining ring 59 support element 57 and the sealing element 56 in place. Optionally, as shown in figa, locking element, such as a cover, seal or valve element 60 may be configured to seal to the valve seat 62 of the seal housing 12 of the transmission 10, so that the housing 12 are formed two barriers. The element 60 can be entered from the top or through the side hole.

For continuous circulation of drilling fluid down a borehole WB (shown schematically in figv), for example, when you want to add a new item or a candle pipes above the sub 10, the cap 21 is removed from the hole 13 and then (when the cap 21, tucked away in the side, and the locking device 42, located as shown in Fig.9) drilling mud is pumped from the active system ARS supply of drilling mud drilling rig (shown schematically in figa) in the housing 102 of the system 100 through the channel 11 through the opening 13 and the depth of the borehole WB, thus providing a continuous circulation in the area of the Y.

Within the scope of the present invention, among other things, the use of the device in accordance with the present invention (such as, for example, device 1) in combination with the sub in accordance with the present invention (such as, for example, sub 10) with pipe wrench (the term "pipe wrench" includes pipe wrenches and rotators), with pipe wrenches or with a device for mechanical suspension and unscrewing pipes. In one aspect, the system in accordance with the present invention provides independent support and independent moving device for moving system relative to the tube or pipe string, and relatively pipe wrench, pipe wrenches or device for mechanical suspension and unscrewing pipes. In other aspects of the system in accordance with the present invention supported on the same support or frame which supports a pipe wrench, pipe wrench or device for mechanical suspension and unscrewing pipes, and a pull-out device is connected to the bracket or frame, moves the system in accordance with the present invention with a device for mechanical suspension and unscrewing pipes or independently of it.

System 200 in accordance with the present invention, shown in figa and 11B, contains shown schematically device 202 for manipulieren is of pipes (which may be any such device, including but not limited to, pipe wrench, pipe wrench, pipe wrench and holding the wrench, pipe wrench and drill key or rotator, or a device for mechanical suspension and unscrewing pipes), which in one aspect is a device for mechanical suspension and unscrewing pipes (any suitable known system or device for mechanical suspension and unscrewing pipes) with a pull-out device 204 (shown schematically in figv) for extension and retraction device 202 relative to the support frame 206.

The device 100A continuous circulation in accordance with the present invention (such as, among others, the device 100 continuous circulation described in this document) is connected with a pull-out device 210 for extension and retraction device 100A continuous circulation with respect to the frame 206. Pipeline device 220 communicates with the device 100A continuous circulation from the supply system of the drilling fluid drilling rig (such as the system shown in figa).

Sub 10A (as, for example, sub 10, described above) is used with the system 200. Sub 10A is connected with the column SG, continuing down into the well. As shown in figv and 11C, the device 202 for mechanical suspension and unscrewing pipes and device 100A of continuous the main circulation is displaced towards and then next to the sub 10A. The device 100A continuous circulation in operable connection with the device 202 for mechanical suspension and unscrewing pipes, which are made with the ability to perform actions on the pipe above the sub 10A. The device 202 for mechanical suspension and unscrewing pipes can be moved together with or independently from the device 100A continuous circulation.

Figa-12D depict various stages in the extension of the system 300 to move the device 100b continuous circulation (such as device 100A continuous circulation or device 100 continuous circulation). Retractable device 230, coupled with a supporting frame, a box-like profile or I-beam 228, includes rear lever 232 which is connected with the possibility of rotation on one end to the frame 228, and at the other end of the forward lever 236. Front lever 236 is connected to rotate with the device 100b continuous circulation. Pipeline unit 250 connects the device 100b continuous circulation system supply of drilling mud. Support frame 228, such as frame 206 that is capable of supporting the device 100b continuous circulation and device for mechanical suspension and unscrewing pipes or pipe wrench (pipe wrench) and rotator (rotators). The device 100b continuous circulation can move through delnoy system 100C move (shown schematically in figa) or can be selectively connected with a device for mechanical suspension and unscrewing pipes and move, when you move the device for mechanical suspension and unscrewing pipes. When introduced engages the latch 238, as described below, the lever 232 is not able to move, and the lever 236 is able to move.

The latch 238, held in the locked position of the latch with the locking element 238m on the frame 228 by the force of the spring 234, prevents movement of the rear lever 232, when the device 100b continuous circulation is in "source" position. The latch 238 has one end connected to rotate with the rear lever 232, and the other end connected to rotate with the connecting element 240, which is connected to the lever 236. The spring 234 is located in the connecting element 240. To move the lever 236 when the geared latch lever 238 232 secured against movement, and a spring 234 is running out, the end rod a to latch 238.

As shown in figs, the latch is disconnected, and the device 100b continuous circulation began moving towards the entrance of the well. Continued movement of the device 100b continuous circulation shown in figs.

Fig.12D shows the sliding unit 230, fully extended, and the device 100b continuous circulation in the center of the well, a part of the locking sub 10b (such as sub 10A, such as a sub 10).

P is the tool device 100d selective compounds (shown schematically in figa), the device 100b continuous circulation selectively connected with a device for mechanical suspension and unscrewing pipes above system 100b (as, for example, the device 202 for mechanical suspension and unscrewing pipes shown in figa). Between the device 100b continuous circulation and device for mechanical suspension and unscrewing pipes may be used any suitable compound or compounds, such as, among others, the latch or latches selectively protruding pins and/or pistons, which protrude from one device 100b continuous circulation and devices for mechanical suspension and unscrewing pipes into the holes and/or recesses in the other magnetic storage devices, roller or rollers on one of the parts, selectively coming into the corresponding slots on the other part, connecting with removable fastening material.

Figa and 13B illustrate the operation of latch 238. Spring 234 applies pressure fixing for holding the latch in the closed, locked "source" position (as on figa and 13B). As shown in figa (pigv), when rosapenna the latch lever 232 is able to move.

Pipeline device 250 moves out and play with the system 100b. Pipeline device 250 includes compacted, the United States can be rotated pipe 252, 254 and a flow line 256, in communication with the supply system of the mud.

Thus, the present invention provides in some, but not necessarily all, embodiments implement a system for downhole operations with continuous circulation, containing the system of the sub containing the sub made with the possibility of being in communication with the tubular casing of the borehole and comprising: a casing, preferably cylindrical, having a first end, a second end and an outer surface, and a second end configured to connect with a tubular casing of a well, a channel through the body, passing from the first end to the second end and having an inner boundary formed by the inner surface of the housing and communicated with the tubular column wells, lateral the hole in the body, passing from the outer housing to the inner surface, and a system of sub optionally includes a locking device having a body provided with a side opening in the hull of the sub, and the locking device includes a locking mechanism located outside the housing and including a locking element in the housing, made with the possibility of selective injection into the lateral hole and remove from the channel of the housing and can move to select the aqueous shut off the flow from the first end of the housing. Such a system may contain one or some, in any possible combination, of the following: a device for manipulating pipes near the system of the sub; a device for manipulating pipes, which is one of: pipe wrench, pipe wrenches, pipe wrench and holding the key, pipe wrench and drill key or device for mechanical suspension and unscrewing pipes; the sub made with the possibility of selective displacement device for manipulating pipes; sub, optionally containing a flap attached with the ability to remove and seal in the side hole and comprising a housing, a stub and a clamping mechanism connected to body plugs for fastening with removable plugs in the side hole; a device for moving a stub which is connected to the cap for removal of the insert from the side holes; a device for moving a stub that includes a spacer structure made with the possibility of moving for connection with a plug and actuating the clamping mechanism to remove the plugs from the side holes; sub, optionally containing two spaced recesses lateral openings provided with a side opening, and the clamping mechanism includes od is at or two dogs, each of which is configured to selectively move into and out of one of the two spaced grooves side holes; the inner surface of the hull of the sub, which is curved, and the plug having an outer curved surface that is essentially flush with the inner surface of the housing; a valve housing of the device containing the internal space, while the drilling fluid can move through the inner space of the housing in the channel body of the sub and exit through the second end of the channel of the housing, so that the tubular string bore may be supported by a continuous circulation of drilling mud; a locking device that includes a sliding axis, and the sliding axis made with the possibility of extension to accommodate the locking element relative to the channel of the housing, and a sliding axis contains the channel axis passing through it, the locking element at the end of the sliding axis, the locking element includes a channel element, passing through it, is in communication with the channel axis, so that when the locking element, the locking movement of the drilling fluid to the second end of the sub, the drilling fluid can move from the first end of the sub to and through the channel element of the locking element and then to and through the channel axis; drilling mud is pumped in per the Vodnik and moves down through the first end of the housing, and the channel axis is in communication with the supply system of the drilling fluid drilling rig so that the drilling fluid coming through the channel axis, is moved in the feeding system of the drilling fluid drilling rig.

Thus, the present invention provides a system for conducting well operations with continuous circulation, the drilling fluid containing system of the sub with the sub, is in communication with the tubular casing of the well, and comprising a housing, mainly cylindrical and has one end, a second end and an outer surface, and a second end configured to connect with a tubular casing of a well, a channel passing through the housing from the first end to the second end, having an inner boundary formed by the inner surface of the housing and communicated with the tubular casing of the well, a side opening in the housing, passing from the outer surface of the shell to the inner surface, the system of sub optionally includes a locking device having a body provided with a side opening in the hull of the sub, and includes a locking mechanism outside the body, which includes a locking element located in the housing and configured to introduce into the side hole and remove from the channel of the housing and with the ability to move the deposits to selectively shut off the flow from the first end of the housing, the device plugs, comprising a housing, a stub attached with the ability to remove and seal in the side hole, the clamping mechanism coupled to the housing plugs for fastening with removable plugs in the side hole, a device for moving a stub which is connected to the cap for removal of the insert from the side holes and including spacer design, made with the possibility of moving for connection with a plug and actuating the clamping mechanism to remove the plugs from the side holes, and the valve housing of the device contains an internal space, and the drilling fluid is able to move through the inner space of the housing in the channel body of the sub and go through the second end of the channel of the housing, so that the tubular string bore may be supported by a continuous circulation of drilling mud, and the locking device includes a sliding axis, which extends to accommodate the locking element relative to the channel of the housing and contains the channel axis passing through it, the locking element at the end of the sliding axis, having a channel passing through it and is in communication with the channel axis, so that when the locking element, the locking movement of the drilling fluid to the second end of the sub, the drilling fluid may p remusatia from the first end of the sub to and through the channel element of the locking element and then to and through the channel axis, moreover, the drilling fluid is pumped into the sub and moves down through the first end of the housing; a channel axis is in communication with the supply system of the drilling fluid drilling rig so that the drilling fluid coming through the channel axis, is moved in the feeding system of the drilling fluid drilling rig, a device for manipulating pipes near the system of the sub. In such a system, a device for manipulating pipes is one of: pipe wrench, pipe wrenches, pipe wrenches and locking key, a pipe wrench, and the drilling of a key or device for mechanical suspension and unscrewing pipes.

Thus, the present invention provides a system for conducting well operations with continuous circulation, comprising: the system of the sub provided with a tubular casing bore and designed to selectively shut off the flow in the tubular string bore, the device for manipulating pipes near the sub, containing one of the pipe wrench, pipe wrenches, pipe wrench and holding the key, pipe wrench and drill key device for mechanical suspension and unscrewing pipes.

1. The method of providing continuous circulation of drilling mud during construction and maintenance of wells containing the moving body (102) of the tool (100) is epreryvno circulation to the sub (10), with the channel (14)passing through it and intended for connection in a string of pipe in the well and selective accommodate movements of the drilling fluid between the housing (102) and a side opening (13) in sub (10)with the tool (100) continuous circulation further comprises a locking device (40), and the actuation of the locking mechanism (41, 44) for insertion of the locking element (42) of the locking device (40) through a side opening (13) in sub (10) to isolate the flow of drilling fluid through at least one section of the channel (14).

2. The method according to claim 1, in which the displacement of the drilling fluid in the borehole is directed from the housing (102) via the locking element (42).

3. The method according to claim 1 or 2, in which the locking device (42) includes a channel (44a) for directing drilling fluid through the locking element (42) and into or out of the channel (14) of the mentioned sub (10).

4. The method according to claim 1 or 2, further comprising removing the cover plate (21) of the side holes (13) before the introduction of the locking element (42) through a side opening (13).

5. The method according to claim 4, in which the removal of the cover plate (21) is carried out through the introduction of a spacer element (19b) in the cover (21) to facilitate its removal.

6. The method according to claim 5, in which the spacer element (19b) is introduced between at least two elements (24) for razdvojeni is to remove the cover plate (21) of the side holes (13).

7. The method according to claim 4, additionally containing an actuation device (15) for moving the plugs to remove and return to place.

8. The method according to claim 4, further containing a deletion of the locking element (42) of the channel through the side hole (13) and return to the place of the stub (21).

9. The method according to claim 1 or 2, in which the locking mechanism (41, 44) contains at least one element (41)is made with the possibility of selective extension.

10. The method according to claim 1, wherein the locking mechanism (41, 44) contains a pull-out element (44) with the drive.

11. The method according to claim 10, in which a sliding element (41) with the actuator is at least one of: piston with a hydraulic actuator and cylinder, the piston of the pneumatic actuator and the cylinder, rack and pinion linear actuator.

12. The method according to claim 10 or 11, in which the sliding element (41) contains the first and second ends, and a sliding element (44) with actuator includes proximal and distal ends, the first end contains a locking element (42), a second end attached can be moved to the distal end and the proximal end attached to the housing (102).

13. The method according to claim 1 or 2, in which the sub (10) comprises a protrusion (12s), and the method includes pressing the locking element (42) to tab (12s).

14. The method according to claim 1 or 2, in which the tool is not the reading of the circulation is on the console (210) to provide travel to and from the sub (10).

15. The method according to claim 1 or 2, in which the device (202) for manipulating pipe is placed over the tool (100) continuous circulation, and the method includes the use of the device (202) for manipulating pipes for connection of the sub with the pipe.

16. The method according to item 15, in which the device (202) for manipulating pipe is located on the console (204).

17. The method according to item 15, in which the device (202) for manipulating pipes is one of: a drive pipe wrench, locking wrench, pipe mechanical key, the drilling of the key devices for mechanical suspension and unscrewing pipes.

18. A device for implementing the method according to any one of claims 1 to 17, containing sub (10) for connection in a string of pipe and the tool (100) continuous circulation, and sub (10) includes a housing (12)having a channel (14)passing through it, and a side opening (13), the tool (100) continuous circulation includes a housing (102)provided with a side opening (13), and a locking device (40)containing the locking mechanism (41, 44) and the locking element (42)made with the possibility of selective introduction and removal of the side holes (13) for the selective isolation of flow of drilling fluid through at least one section of the channel (14).

19. The device according to p, where sub (10) contains naru is ing surface, located essentially flush with the outer surface of the pipe in the string of pipe, which is connected to the sub (10).

20. The device according to p, in which the locking device (42) includes a channel (44a) for directing drilling fluid through the locking element (42) and into or out of the channel (14) sub (10).

21. The device according to p or 19, in which the sub (10) further comprises a plug (21) to seal the side holes (13).

22. The device according to item 21, in which the tool (100) continuous circulation further comprises a spacer element (19b) for insertion into the recess (21) in order to facilitate the removal of the stub (21).

23. The device according to item 22, in which the stub (21) contains at least two elements (24)and spacer element (19b) is designed for the separation to remove the cover plate (21) of the side holes (13).

24. The device according to item 21, further containing device (15) to move the stub.

25. The device according to p or 19, in which the locking mechanism (41, 44) contains at least one element (41)is made with the possibility of selective extension.

26. The device according to p or 19, in which the locking mechanism (41, 44) contains a pull-out element (44) with the drive.

27. The device according to p, in which a sliding element (41) with the actuator is at least one of: piston with a hydraulic actuator and cylinder, archna with pneumatic actuator and cylinder, the rack with a pinion linear actuator.

28. The device according to p, in which the sliding element (41) contains a first and a second end, and a sliding element (44) with actuator includes proximal and distal end, the first end contains a locking element (42), a second end attached can be moved to the distal end and the proximal end attached to the housing (102).

29. The device according to p or 19, in which the sub (10) comprises a protrusion (12s) to compress the locking element (42).

30. The device according to p or 19, in which the tool (100) continuous circulation of placed on the console (210) to ensure that it moves to and from the sub (10).

31. The device according to p or 19, which contains a device (202) for manipulating pipes placed over the tool (100) continuous circulation to ensure connection of the sub with the pipe.

32. The device according to p, in which the device (202) for manipulating pipes placed on the console (204).

33. The device according to item 30, in which the device (202) for manipulating pipes is at least one of: a drive pipe wrench, locking wrench, pipe mechanical key, the device for mechanical suspension and unscrewing pipes.

34. System for carrying out downhole operations with continuous circulation of the Boers the solution, containing the tool (100) continuous circulation provided with a tubular column of wells containing sub (10) and designed to selectively shut off the flow of drilling fluid in the tubular string bore, the device (202) for manipulating pipes near the sub, containing one of: pipe wrench, pipe wrenches, pipe wrench and holding the key, pipe wrench and drill key and device for mechanical suspension and unscrewing pipes.



 

Same patents:

FIELD: oil and gas industry.

SUBSTANCE: system and method for increasing a well flow rate are described in the application. The system includes processor (150) that processes commands contained in a software, which include command for monitoring during the specified period of time of an actual fluid flow rate from each productive zone (52B, 52b) of the well in compliance with the first tuning of devices for control of the flow rate and applying the analysis of the chain using a method of node potentials to a variety of input data chosen from the data of well sensors, data of surface sensors, one or more current positions of devices, for the purpose of setting one or more new settings, at which increase in the well flow rate will be provided.

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18 cl, 6 dwg

FIELD: oil and gas industry.

SUBSTANCE: system includes several tubular elements located in each other with the channels directing the fluid flows from different formations of the well to different channels of tubular elements fixed in the casing pipe by means of packers. Channels are equipped with spool-type gates with control electric drives providing separate movement of fluid flows from different formations through different channels by means of a processor and a fluid parameter measurement sensor installed in each channel and functionally connected to the automatic control processor of the valve in compliance with the information received from the sensor, and further selective mixing of flows in the area of the casing pipe. Tubular elements are fixed in the casing pipe with upper packer, and at their inlets, they are connected to the coupling directing different flows via different channels from different formations, which is connected via a central channel by means of the shank to the extracting device of the product from bottom formation of the well, which is fixed in the casing pipe with lower packer. Unit of separate supply and accounting is connected via a branch pipe to the electric drive of the submersible centrifugal pump, in which a communication cable is placed to control the valves from the electric feed and control cable, which attaches the pump electric drive to the well electric feed and control station.

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3 cl, 1 dwg

FIELD: oil and gas industry.

SUBSTANCE: method includes blocking of a perforation interval by means of injection of a blocking liquid and its pushing with a killing fluid to a bottomhole and to a bottomhole area of a bed with simultaneous monitoring of pressure at a well head, gas relief and process settling. At the same time, prior to injection of the blocking fluid, a sand screen is formed by injection of a pulp of quartz sand with fraction of 0.6-1.2 mm in a carrier fluid in two portions with a flow rate of a carrier fluid, the value of which does not exceed the maximum permissible value, defined according to the formula. At the same time the volume of the quartz sand in the first portion of the pulp is calculated in accordance with the formula with further process settling of the well for the time determined according to the formula after injection of the first pulp portion. The volume of the quartz sand in the second pulp portion is taken as equal to the volume of suffosion channels produced in the sand screen. The blocking fluid is a certain composition. The blocking fluid volume is previously calculated according to the formula. Besides, at the moment of completion of blocking fluid pushing, hydrodynamic pressure is determined in a tubing string. Afterwards the process settling of the well is carried out. Further injection of the killing fluid into the well is carried out along the tubing string until it appears at the well head. At the same time the well head pressure is controlled in the annular space of the well by means of gas and blocking fluid relief, providing for pressure at the inlet to the tubing string as permanent and equal to the predetermined hydrodynamic pressure.

EFFECT: improved efficiency of gas well killing.

1 tbl

FIELD: oil and gas industry.

SUBSTANCE: design of low-angle and horizontal wells includes a technical string, an operating string and a lift string. The operating string is cemented above the productive formation roof. The operating string in the productive formation is divided into sections with casing packers, and sections include filter sections and sections of solid pipes. The lift string in the productive formation is equipped with operating packers, installed inside the sections of solid pipes of the operating string and groups of controlled valves equipped with calibrated inlet side holes arranged inside filter sections. A seat nipple is installed at the end of the lift string. Controlled valves and the nipple are made as capable of interaction with control devices lowered inside a lift string.

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3 dwg

FIELD: oil and gas industry.

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3 dwg

FIELD: oil and gas industry.

SUBSTANCE: method of fluid extraction from the well is performed in the following way: the first adjustment at least of the first well equipment for fluid production is performed; the first set of input parameters is chosen, which includes at least one parameter referring to serviceability degree at least of one second well equipment and sets of parameters chosen from the group including the data referring to efficiency, pressure, temperature, presence of the chosen reagent, content of water, content of sand and flow rate of injected chemical reagents. The first set of parameters is used to be entered to the computer model, and the second adjustment at least of one first well equipment is performed, which will provide at least extension at least of one second well equipment or increase in completed well flow rate. Also, control system of operation of electric submersible pump is proposed, which contains information storage data base relating to operating range of submersible pump, and processor for adjustment at least of one first well equipment, which has the possibility of using at least one measured operating parameter of submersible pump and information stored in the data base.

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25 cl, 4 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: invention relates to production of natural gas ad may be used in methane-coal well development. Proposed method comprises perforation of operation string in interval of production bed and its hydraulic fracturing. Thereafter, operation string is flushed. Settled fluid level allows defining initial counter pressure on productive coal bed. Production tubing with borehole pump is lowered into flow tubing, the pump being located under perforation interval. Well head is sealed. Borehole pump is used to reduce fluid level in well annuity space to below perforation interval together with injection of buffer gas therein at initial counter pressure on the bed. Thereafter, feed of buffer gas is interrupted. Said fluid level in annuity space is maintained by means of borehole pump. Inflow of bed fluid is caused by releasing excess pressure of buffer gas from annuity space in control over variation in gas quantitative and/or qualitative composition at well head. Change in released buffer gas composition allows defining the beginning of coal methane from productive bed. Now, rate of buffer gas pressure release is decreased.

EFFECT: higher efficiency of well development.

4 cl

FIELD: oil and gas production.

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EFFECT: efficient injection, safe production of oil or gas.

1 dwg

FIELD: oil and gas industry.

SUBSTANCE: according to the method of oil-gas wells killing on deep water subsea deposits by pumping of certain volume of kill composition together with sea water into the well thus providing creation of killing spout in the well with timeless pressure on formation exceeding formation pressure not less than 1.2 times, as a killing composition, preventing immediate contact of cold sea water with overheated formation fluids and productive stratum of formation, large hydrophobic disperse system is used with density exceeding density of sea water more than 5 times in the volume ensuring in bottom-hole zone of the well creation of spout of large hydrophobic disperse system with height exceeding productive stratum formation opened by perforation not less than 3 times. Mentioned disperse system is a disperse system with volume of 70%, where as disperse medium hydrocarbon liquid is used, this liquid doesn't set solid under temperatures to -10°C, its density is not less than 0.860 g/cm3; as disperse phase a mixture of hard metal balls with diameter within 1-2 mm is used, 50% of this ball mixture volume have fusion temperature well over bottom-hole temperature, and the other 50% of this ball mixture volume have fusion temperature 10°C and more below bottom-hole temperature.

EFFECT: improving reliability of oil-gas wells killing on deep water subsea deposits with excessive temperature and pressure of productive formation.

3 cl, 2 tbl

FIELD: oil and gas industry.

SUBSTANCE: typical well operating equipment can include separator for separation of water from oil, in which the produced mixture of fluid media is obtained and mixture is divided into the corresponding water and oil flows. Water flow can be pumped back to the well. For that purpose, well system for water pumping speed control back to the well can be developed. Group of inventions provides the improvement of well flow control efficiency. Essence of inventions: well equipment designed for receiving fluid medium flows through the first and the second fluid medium flow passage channels is arranged in the well. The above equipment includes flow separation control having the device connected to the first channel and the device connected to the second channel, which are interconnected. Outlet flows in the first and the second channels are controlled by means of the control.

EFFECT: increasing outlet flow in one of the first and second channels in response to increase in outlet flow in the other of the first and the second channels by means of action on one of the above devices to keep constant ratio of outlet flows in the above channels.

16 cl, 6 dwg

FIELD: oil and gas production.

SUBSTANCE: device comprises a spring-loaded stop element, an elastomer seat with guide ribs, collars with central holes, valve seats. The valve is installed in the nipple of the hinged joint or torsion bar of the spindle in a screw bottomhole motor, in which holes are made for possible passage of a working medium.

EFFECT: simplified design, higher reliability.

6 cl, 6 dwg

Shaker machine // 2442876

FIELD: mining equipment.

SUBSTANCE: The invention relates to mining equipment, in particular, to shaker machines which create oscillations in liquid during direct and indirect flushing of mining equipment and well bottom, during bed stimulation and discharge of producing energy. The device comprises a frame where a rotatable crankshaft is installed on the axis. Furthermore, valves are fixed with pins at both ends of the crankshaft. The installation of valves at upper and lower part of the crankshaft allows to oscillate the liquid in both directions during direct and indirect flushing. The lower valve creates a hydraulic resistance to the liquid flow, reduces oscillation frequency for the upper valve, thus increasing the oscillation amplitude of the liquid.

EFFECT: production of the said device.

3 dwg

FIELD: oil and gas industry.

SUBSTANCE: borehole circulation adapter or valve includes tubular housing having external hole and valve piston installed with possibility of sliding inside the housing. Primary fluid medium flow trajectory passes through internal delivery orifice of the housing and valve piston. In the first position the valve piston covers the external opening for decoupling with fluid medium between internal delivery orifice and annular gap of well shaft. In the second position the valve piston moves to lock the internal delivery orifice and connect the external opening to internal opening and to establish the connection by means of fluid medium between internal delivery orifice and annular gap of the well. Dividing mechanism is fixed between the housing and valve piston for direction of movement of valve piston between the first and the second positions. In the versions of the implementation the dividing mechanism includes turning element.

EFFECT: random fluid medium circulation inside the well shaft, possibility of continuous operation of the valve and reduction of the valve stroke.

24 cl, 13 dwg

FIELD: oil and gas production.

SUBSTANCE: back valve consists of case with seat, and of locking device installed in bore, interacting with seat and equipped with spring elements in form of two plate springs. The locking device has two locking elements made of halves of circular cylinder by section of each with two mutually transverse inclined surfaces, upper one of which is inclined at angle below 90° to plane of cylinder circumference, while the side surface is inclined at the same angle to its axis. Upper ends of the locking elements interacting with the seat and their side interacting surfaces are covered with elastomer. A unit of fixation of locking and flexible elements in the case is made in form of a ring secured in the bore of the case.

EFFECT: simplified design, raised reliability and expanded functionality at minimal overlapping area of pass-through channel.

5 dwg

FIELD: oil and gas production.

SUBSTANCE: circulating valve consists of coaxial case and piston inter-engaged by means of pins and slots. The first system consists of a case, of a closer with channels communicating an internal cavity of the system with annular space of a well, of a packing, of an upper and lower arresters of piston travel; while the piston system consists of the piston with a throughput channel and a packing, of a valve switch with radial channels and of a compression spring. The throughput channel of the piston converges at an inlet section and diverges at an outlet section. At a section of maximal convergence a bypass channel is made in the piston; the channel hydraulically communicates the throughput channel with a behind-the piston cavity.

EFFECT: reliability of valve, reduced output of hydraulic power for drilling and hole conditioning.

4 cl, 9 dwg

FIELD: oil and gas production.

SUBSTANCE: valve consists of cylinder case with stepped hole and radial (overflow) hole. There can be several overflow holes. A holder in form of a segment is installed in the stepped hole of the case. In the holder there is made a cylinder cavity wherein there is installed a seat, ball, and a return spring positioned between a bottom of the cylinder cavity and the ball pressing the ball to a stop made in form of a cage with lengthwise holes for liquid flow. The seat is set in the stepped hole of the cylinder cavity and is clutched with the stop installed in the holder, by means, for example, of threaded connection. A threaded radial hole coaxial to the radial hole of the case for flow of liquid is made in the holder. A screw with filtering holes and a hole for flow of liquid is screwed into the holder through the radial hole of the case. The screw maintains the holder in radial and axial directions.

EFFECT: raised reliability and resource of valve operation.

2 cl, 3 dwg

Check valve // 2393326

FIELD: mechanics.

SUBSTANCE: check valve includes body with axial channel, seat, cover with rocker arm, which is suspended on the axis. Axis with elastic coating is installed in the body hole and in holes of protrusions of the rocker arm of the cover pressing the spring to the seat. The seat is formed with the seat bushing and the seat cup from elastic material. Inner groove of the body is provided with annular slot, and outer part of the seat cup is L-shaped and has a ring protruding towards the annular slot. Seat bushing is cylinder-shaped and made in the form of thin-wall ring and is intended for attachment of the seat cup. Body is cylinder-shaped and has two openings located opposite each other between one of the ends of the housing and middle part of the body.

EFFECT: simple design, improved operating reliability, and easy installation and removal.

2 dwg

FIELD: mining.

SUBSTANCE: invention relates to drilling technique and can be used as a valve unit for screw-type downhole motors in a drilling pipe string for connection or disconnection of the internal cavity of drilling pipes and the annular space following the pre-set technological sequence. The valve contains a case, a valve pair provided with a sliding ring, the seat mounted in the case and a hollow plunger accommodated inside the seat, with radial holes in them, a spring mounted on the hollow plunger and gaskets. The valve pair is of the slide type, in which the diameter of the flowing channel is 0.10-0.12 of the length of the hollow plunger and the area of all radial overflow holes of the hollow plunger is equal to the area of flow channel in the cross-section of the hollow plunger. The hollow plunger is of cylindrical form with the sliding ring and the circular collar, located in the lower part of the sliding ring and spring-loaded up to the stop by the upper end of the circular collar to the lower end of the seat. Radial overflow holes of the hollow plunger and the radial holes in the seat and in the case are located at the same level and the spring is mounted between the case stop and the lower end of the circular collar of the hollow plunger.

EFFECT: high reliability of operation of the valve in the process of drilling, excluding spill of flush fluid during lifting the drilling pipe string and filling the internal cavity of pipes during dropping.

2 dwg

Well drilling rig // 2271435

FIELD: mining industry, particularly well drilling with direct or reverse circulation of mud, as well as well repair.

SUBSTANCE: rig comprises double pipe string with annular cavity defined in-between and jet device provided with check valve. The injection device is formed as body connected with inner pipe string. The body is provided with radial channels and annular nozzle set having receiving channels. The receiving channels are aligned with the radial channels to supply compressed air through annular nozzles in annular space at an angle to jet device axis.

EFFECT: increased pulp lifting capacity due to improved efficiency of pulp mixing with compressed air.

4 cl, 1 dwg

The downhole valve // 2233963
The invention relates to the field of drilling, in particular, to devices for preventing zalamovanie downhole devices, emissions of gas and liquid through the drill string

FIELD: construction.

SUBSTANCE: support unit of a hydraulic wrench rotor includes support elements arranged in the body and contacting with the end surface of the geared rim and the cylindrical external surface of a split gear of the rotor, besides, support elements are made of two cylindrical support plates installed in the body and joined together, having cavities along the inner diameter in the place of their connection, at the same time the end surface of the geared rim and the cylindrical outer surface of the split gear of the rotor contact with appropriate surfaces of the support plates cavity arranged from a composite material.

EFFECT: increased reliability of device operation with simultaneous simplification of design and cheapening of assembly and repair.

4 dwg

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