Device and method of drilling with continuous bit rotation and continuous drill mud supply

FIELD: oil and gas industry.

SUBSTANCE: group of inventions relates to the device and method of drilling with continuous bit rotation and continuous drill mud supply. The device for drilling rig that contains the first drilling machine with top drive, installed with possibility of vertical movement along guide, and second drilling machine installed between the first drilling machine and well with possibility of the vertical movement along the guide regardless of the first drilling machine with top drive and provided with rotary table, able to withstand weight of the drilling string, rotation drive ensuring continuous rotation of the drilling string, and mud chamber ensuring liquid connection between end of the drilling string and unit for mud supply, at that the mud chamber is equipped with holes for the drilling string containing devices that can close holes for the drilling string ensuring liquid tightness. The second drilling machine is also equipped with the driven casing tongs that ensure connection and disconnection of the element and drilling string, at that the specified driven casing tongs are installed in the mud chamber and are made with possibility of vertical movement to connect/disconnect element and drilling string.

EFFECT: connection/disconnection of pipe elements with drilling string is ensured with continuous bit rotation and with continuous mud supply.

10 cl, 7 dwg

 

The technical field to which the invention relates

The invention relates to a device for drilling rig, designed to get the well into the subterranean structure, wherein the drilling rig comprises a first drilling machine with a top drive installed with possibility of vertical movement along the guide, the second drilling machine, and more particularly mounted between the first drilling machine and bore with the possibility of vertical movement along the guide and is provided with a rotary table which can support the weight of the drill string, a rotary drive, designed for continuous rotation of a drill string, a liquid chamber that provides fluid connection between the end of the drill string and block the flow of drilling fluid, when this liquid chamber contains holes of a drill string, which are equipped with devices that provide an airtight closure for closing said apertures to a drill string and driven pipe wrench designed for continuous rotation element connected to the drill pipe and mounted in the liquid chamber. Furthermore, the invention relates to a method for drilling with continuous rotation of the drill and a continuous flow of drilling mud.

The level of technology

Underground drill�research Institute, in particular, when search-exploratory and production drilling for oil and gas, with the deepening of wells permanently attach new sections of drill pipe. During each such operation the rotation of the drill string is stopped, and in most used methods at the same time stop the circulation of drilling fluid at a time until a lengthening the drill string. The lack of such interruption of rotation and circulation of the drilling fluid are well known to those skilled in the art. Transportation of debris drill cuttings from the well are terminated, therefore, the drill cuttings debris begin to fall and can settle in the horizontal portions of the well. This can lead to loss of time, since before resuming drilling operations necessary to produce the circulation of the drilling fluid to clean the well. In addition, during the cessation of rotation of the drill string increases the risk of sticking the drill string in the borehole due to accumulation of the sinking of the drill cuttings debris and increase friction with the wall rocks due to the pressure difference between the borehole and the surrounding rock. Another drawback is that the cessation of drilling fluid circulation leads to changes in drilling fluid pressure and if the pressure goes supercritical limits formation fluid may flow into the borehole or drilling mud can enter the breed, both are undesirable.

NO 326427 a device for a top drive in which the drive shaft providing a detachable connection to the leading gear and with the first end of the drill pipe, provided with a Central through-channel, designed for liquid connection between the power supply of the drilling fluid and the liquid channel in the drill pipe. The casing of the first and second releasable drive shaft or casing drill string, respectively, to seal the valve in an open position to provide a passage through the drill pipe or drive shaft, to form a first and second chamber. An inlet for drilling fluid located in the second chamber and is designed to provide a fluidic connection between the power feed drilling mud and casing couplings. This ensures the possibility of continuous circulation of drilling mud, however, when installing a new section of drill pipe rotation of the drill string has to stop.

GB 2399112 describes a method and apparatus for installation of the connecting pipe components during drilling without stopping the rotation of the drill string or circulating fluid through the drill column. This provides a�recover as a result of interaction between the top drive and rotary table. Device for the circulation, attach to the threaded portions of the pipes used to circulate the fluid when the top drive is disconnected from the drill string.

US 6412554 describes a system for continuous fluid circulation to the drill string and through the drill column, for example, through a flexible long tubes or through the drill column, consisting of bolted pipe sections together. The system includes upper and lower chamber having a through hole for passage of a drill string in which is mounted a sealing device, closely adjacent to the drill string.

The system also includes devices for rotation and axial movement of a drill string or pipe components relative to the camera.

Disclosure of the invention

Object of the invention is to eliminate or reduce at least one of the drawbacks of the prior art or at least provide a useful alternative to the prior art.

This problem is solved by using the device and method are presented below in this description and the attached claims.

The invention provides a device for drilling rig, which creates the possibility of continuous rotation of the drill string, and continuous circulation of drilling mud so the drilling part of the borehole can be performed continuously. The invention contributes to the improvement of productivity in drilling. According to the invention are used, two drilling machines installed over the drill pad is symmetrical to its Central axis, the first, upper drilling rig is a top drive of the prior art and performs the basic steps of drilling operations, including the rotation of the drill string, the flow of drilling fluid into the drill column, move the drill string in an axial direction, and the rotation of the section of drill pipe relative to the drill string during Assembly of a drill string, and a second, lower drilling machine equipped with a device that can be attached and simultaneously rotating the drill column, giving, in addition, the flow of drilling fluid into the drill string.

Both drilling machines contain a device intended for independent vertical movement along guide rails in the derrick, passing upward from the drillsite or Drilling machine etc. can join the same group guides.

The first drilling machine has a drive shaft which passes vertically down and for practical purposes is usually equipped with a nozzle. In the following description, the term "drive shaft" in all cases incl�em drive shaft, with physical elongation removable nozzles or made as one integral element. If the shaft extension is crucial, uses the term "nozzle drive shaft".

The second drilling machine has a Central through hole and comprises a rotary table designed for continuous rotation of the drill string, and a device for suspending a drill string, for example, in the form of so-called "V-grip". Above the rotary table is mounted a rotary drive, which provides a detachable connection with a portion of the drill string. Driven pipe wrench designed for continuous rotation, mounted on a rotary drive in the liquid chamber. The liquid chamber has top and bottom openings, the centers of which are located on the axis of a drill string and which provide a through passage of drill pipe, wherein both openings are equipped with tight seals around the drill column or section of a drill string. In addition, the upper opening is provided with a shutoff valve, which can close said hole, and in the open position creates a through passage through the drill string section. The liquid chamber contains a device for supplying drilling fluid under pressure and for discharging drilling �of astora liquid from the chamber. The liquid chamber is preferably provided with a ventilation channel, which is intended for input of air or other gas in the liquid chamber and the withdrawal from it.

The drilling process is as follows:

a) the First drilling machine rotates the drill column and delivers drilling fluid to the Central bore of a drill string in known manner as long as no need to lengthen the drill column by means of the new section of pipe. The section of the pipe is suspended in the rotary table. A part of first drive shaft of the drilling machine or perhaps the nozzle drive shaft (hereinafter called for simplicity "drive shaft") is held in the liquid chamber and covered driving with a pipe wrench. Hermetic seals surround the drill column and drive shaft.

b) After adaptation to the speed of rotation of the actuator to the speed of rotation of the drill string rotation drive and drill string are connected together, wherein a drill string continues to rotate. Then, the first drilling machine can be disconnected, since the rotation of the drill string is provided by the lower drilling machine.

C) After adaptation to the speed of rotation of the drive tube key to the speed of rotation of the drill string it engages with the drive shaft. Hermetic seals are activated.

g) as a result of sync�stimulated the functioning of the rotary drive and the drive Tong threaded connection between the drive shaft and the drill pipe is interrupted, at the same time in the liquid chamber high pressure is created. Since drilling fluid may flow into the drill column from the liquid chamber, the flow of drilling fluid into the first drilling machine is terminated.

e) the Drive shaft is disconnected from the drive Tong and when the vertical displacement of the first drilling machine exits the shut-off valve, which is closed as long as the top tight seal will not be deactivated and the drive shaft won't come out of the upper opening of the liquid chamber.

(e) Rotation and vertical movement of the drill string and the drilling fluid delivery is provided to lower a drilling machine, while a new section of drill stem is attached to the drive shaft of the first drilling machine.

g) Section of a drill string is inserted in the upper opening of the liquid chamber. A tight seal is activated. Shutoff valve opens and the section of drill string is moved down into the liquid chamber to lock in the drive pipe wrench to connect with the drill pipe during the concurrent rotation of the rotary drive and the drive Tong, at the same time, starts the flow of drilling fluid through the first drilling machine and the drilling fluid delivery through the liquid chamber is terminated.

h) Vra�Linux, vertical movement and flow of drilling fluid is provided by first drilling machine, for the rotational drive of the lower drilling machine is disconnected from the drill string, the fluid chamber is in drain mode, and an airtight seal is deactivated.

and Operations a) to h) are repeated until, until finished the drilling process.

The first aspect of the invention more specifically relates to a device described in paragraph 1 of the attached claims of the invention. Alternative implementation options described in paragraphs 2-9 of the attached claims.

The second aspect of the invention more specifically relates to a method as described in paragraph 10 of the attached claims.

The third aspect of the invention relates to the application liquid chamber that can be closed and in which is mounted a driven pipe wrench, for supplying drilling fluid to the drill column using a drilling machine equipped with rotary table.

Brief description of the drawings

The following is an example description of the preferred embodiment of the invention, illustrated by the attached drawings, in which:

Fig.1 is a side view of the drilling rig, containing two interacting drilling machine, the lower drilling machine shown in section;

Fig.2 is a block flow drilling solution�, coupled with drilling machines, in reduced scale;

Fig.3-7 types of side various operations of a continuous process of drilling, with arrows and black seals marked active component and the path of the drilling fluid, in particular:

Fig.3 is a drill string that is driven through the bottom of the drilling machine and the drill string section, you are ready to attach to the first drilling machine;

Fig.4 - section of a drill string connected to the first drilling machine and introduced into the upper opening of the liquid chamber containing an airtight seal;

Fig.5 - section of a drill string passing through the stop valve liquid chamber and connected to a drive wrench shown in rotation;

Fig.6 - the section of drill string to be disconnected from the drive Tong and connected with the drill pipe, which is disconnected from the turntable and is driven for the first boring machine to drain the drilling fluid from the liquid chamber; and

Fig.7 is a drill string driven by a first drilling machine and freely rotating relative to the lower drilling machine.

The implementation of the invention

In the drawings, reference number 1 designates a known, essentially, top drive, also called hereinafter the first boring machine. It is traditionally SN�been drive shaft 11 and a nozzle 12 of the drive shaft, and also contains an inlet opening 13 for drilling mud and attached to the derrick 2 is movable in the vertical direction along the guide 21. Drilling machine 1 is located symmetrically relative to the Central axis 62 of the bore 6.

Between the first drilling machine 1 and the bore 6 are mounted the second drilling machine 3, is connected to a second drilling rig 4 is movable in the vertical direction along the guide 41.

Drill string 5 passes down into the hole 6 (see Fig.2) and consists of a plurality of sections of drill string 52, which are attached by means of a threaded connection 51 by the end of the drill string 5. Section 52 of the drill string contains a guide tube 521, part a which has a polygonal cross-section providing a detachable connection with the second drilling machine 3. Drill string 5 is provided with a drill head 53.

The bore 6 extends from the mouth 61 of the borehole down into the underground structure 63.

Drilling machine 1, 3 have a liquid connection unit 7 flow of drilling mud, which comprises a pump 71 for drilling mud, line 72 feed intended for feeding the drilling mud pressure in the drill head 53 through drilling machines 1, 3 and the Central hole in the drill string 5, the pressure line 73, which provides liquid soy�the coalescing of the pump 71 to the drilling fluid to a reservoir 74 for drilling mud, and return line 75, which connects the mouth 61 of the bore and the reservoir 74 for drilling mud.

Line 72 feed contains the first line 721, provided with a first shut-off valve 723 to regulate the flow of drilling fluid into the first drilling machine 1, and a second line 722, is provided with a second shut-off valve 724 to regulate the flow of drilling fluid to the second drilling machine 3. The discharge line 76 connects the second drilling machine with a reservoir 74 for drilling mud.

The second drilling machine 3 comprises a rotary table 31, is provided with wedge-type grip 311, which is designed for hanging the drill string 5 in the rotary table 31 is essentially known manner. The rotary drive 32 connected to the rotary table 31 provides a detachable connection with a polygonal part 521a of the guide tube 521 to rotate the drill string 5 around its Central axis when the drill string is suspended in the rotary table 31. Above the rotary table 31 is mounted a drive pipe wrench 33, providing continuous rotation. Driven pipe wrench 33 is located in the liquid chamber 34, which provides the lower and upper openings 341 and 343 to the drill string, respectively. Each of the openings 341 and 343 to a drill string is provided with an air-tight seal 342 and 344, respectively, which creates a surrounding support d�I'm part of a drill string 5, the drill string section or nozzle 53 of the drive shaft 12 of the first drilling machine to close openings 341, 343 to the drill string. Between the liquid chamber 34 and the upper air-tight seal 344 is installed shutoff valve 345 which in the open position provides a passage through section 52 of the drill string and at least a lower end attached to the nozzle 12 of the drive shaft.

Liquid chamber 34 also contains an inlet for drilling fluid 35, which has a fluid connection with the second line 722. Drain hole 351 liquid chamber that can be closed, intended for draining the drilling fluid from the liquid chamber 34 to the reservoir 74 through the drain line 76. Ventilation duct 352 liquid chamber is located in the upper part of the liquid chamber 34 and is suitable for venting air and other gases in the liquid chamber 34, when the liquid chamber is filled with drilling mud or exempt from it.

The rotary table 31, the rotary drive 32, the drive pipe wrench 33 and openings 341, 343 in the liquid chamber to the drill string to form a Central hole 36 which passes through the second drilling machine 3 and the center of which is located on the Central axis 62 of the bore 6.

When the drilling process is performed with the use of a drilling rig according to the invention,the drill string 5 is rotated and moved in the first phase using a first drilling machine 1, thus drill string 5 passes through the Central hole 36 of the second drilling machine 3 and moves freely relative to the second drilling machine 3 (see Fig.7). Drilling mud is circulated through an inlet 13 for drilling mud first drilling machine 1 in the drill head 53 and returns to the reservoir 74 for drilling mud through the annular space 54 (see Fig.2), the mouth of 61 wells return line 75 and the necessary technological equipment (not shown), which is known to be used for treatment of drilling mud. The second drilling machine 3 is moved in the vertical direction in the upper initial position.

When a polygonal section 521a of the guide tube 521, located in the upper part of a drill string 5, is included in the rotary drive 32 of the second drilling machine 3, the guide tube is driven to rotate together with the drill pipe 5 and is connected with the drill pipe 5. Drill string 5 is suspended in the rotary table 31 using the V-grip 311, essentially, in a known manner. Driven pipe wrench 33 rotates together with the drill pipe 5 and is connected with a nozzle 12 of a drive shaft passing through the drive pipe wrench. While rotating the drill string may be the second drilling machine 3, as the driving gear of the first drilling machine 1�connected.

In the next phase of the lower and upper hermetic seal 342, 344, and the hole 351 liquid chamber are closed, and the drilling mud is fed in the liquid chamber 34 and the check valve 724 in line 72 of filing opens. When reducing the speed of rotation of the drive tube key 33 on the rotary drive 32 the connection between the nozzle drive shaft and the drill pipe is broken, and drilling mud is supplied through the liquid chamber 34 and the open end 51 of a drill string. Supply of drilling mud for the first drilling machine 1 is stopped, since the shutoff valve in line 723 72 submission closes. The rotation and movement of the drill string 5 in the second drilling machine 3.

The first drilling machine 1 is removed from the second drilling machine 3, as the cut-off valve 345 of the second drilling machine 3 is closed as soon as the nozzle 12 of the drive shaft comes out of the center channel of the shutoff valve 345, while the upper seal 344 continues to hermetically cover the nozzle 12 of the drive shaft. After that, the upper seal 344 is moved back, and the nozzle 12 of the drive shaft comes out of the second drilling machine 3 for connection with the next section of drill string 52 (see Fig.3).

The first drilling machine 1 peremeshaem� in the direction of the second drilling machine 3 as long while the lower end section 52 of the drill string is not surrounded by the upper air-tight seal 344, which is then activated and tightly covers the section of the drill string 52 (see Fig.4). The shut-off valve 345 is opened, and the first drilling machine 1 and the drive pipe wrench 33 rotates together with the drill pipe 5. Supply of drilling mud for the first drilling machine 1 is opened (see Fig.5). The speed of rotation of the drive pipe wrenches 33 relative to the rotary drive 32 is increased, since the driving gear of the first drilling machine 1 is disconnected, and the section of drill string 52 is moved in the direction of the end 51 of the drill stem 5 and is connected with the drill pipe 5. Closing of the shut-off valve 724 stops the flow of drilling fluid in the liquid chamber 34.

The rotary drive 32, the drive pipe wrench 33 and the wedge gripper 311 extended detached from the drill string 5, because it works the first drilling machine 1. Drilling mud is discharged from the liquid chamber 34 through the vent hole 351 liquid chamber and the drain line 76, and an airtight seal 342, 344 are discharged from the drill string 5.

This process is repeated until then, until the drill head reaches the desired position.

For specialists in the art it is obvious that rig set�internals according to the invention can be equipped with appropriate means of monitoring and controlling the synchronization of the various operations described above.

1. Device for drilling rig, designed for the formation of the borehole (6) in the underground structure (63), wherein said drilling rig comprises a first drilling machine (1) with a top drive installed with possibility of vertical movement along the guide (21) and a second drilling machine (3) mounted between the first drilling machine (1) and bore with the possibility of vertical movement along the guide (41) independently of the first drilling machine (1) with a top drive and is equipped with a rotary table (31), is able to withstand the weight of the drill string (5)the actuator (32) of rotation providing continuous rotation of the drill column (5), and a liquid chamber (34) capable of providing fluid connection between the end (51) of a drill string and a block (7) for feeding the drilling mud, wherein the liquid chamber (34) provided with openings (341, 343) for a drill string containing the device (342, 344, 345) that can close the hole (341, 343) for a drill string with ensuring impermeability to liquids,
characterized in that the second drilling machine is also equipped with a drive-end wrench (33), which enables connection and disconnection of the element (12, 51) and a drill string (5), wherein said drive pipe wrench (33) installed in the liquid chamber (34) and you�Olsen with possibility of vertical travel for the connection and disconnection of the element (12, 51) and drill column (5).

2. The device according to claim 1, characterized in that the holes (341, 343) for a drill string provided with airtight seals (342, 344) that can surround a portion of the drill column (5), section (52) of a drill string or the drive shaft (12) connected to the first drilling machine (1), ensuring impermeability to liquids.

3. The device according to claim 1, characterized in that the upper opening (343) a drill string provided with a shut-off valve (345), which is installed between the upper air-tight seal (344) and a liquid chamber (34).

4. The device according to claim 1, characterized in that the block (7) for feeding the drilling mud contains a line (72) for feeding, provided with means(721, 722, 723, 724), capable of providing fluid communication of the pump (71) for drilling mud, with the inlet (13) for drilling mud in the first drilling machine (1) having an inlet (35) for drilling fluid in the liquid chamber (34).

5. The device according to claim 1, characterized in that the liquid chamber (34) comprises a closable drain hole (351), which has a fluid connection with the reservoir (74) for drilling mud.

6. The device according to claim 1, characterized in that the liquid chamber (34) is equipped with a closed vent (352).

7. The device according to claim 1, characterized in that the guide rail (21) of the first drilling machine (1) is� on the distance between the guide (41) of the second drilling machine (3).

8. The device according to claim 1, characterized in that the guide rail (21) of the first drilling machine (1) is combined with the guide (41) of the second drilling machine (3).

9. The device according to claim 1, characterized in that the section (52) of the drill string contains a guide tube (521), which provided part (a) having a polygonal cross-sectional profile.

10. Method of drilling with continuous rotation of the drill and a continuous flow of drilling mud containing the following:
a) the drill column (5), provided with a drill head (53), which is located in the borehole (6) in the underground structure (63), connected to the drive shaft (11) of the first drilling machine (1) with the upper drive, passed through the Central hole (36) to the second drilling machine (3) is driven to rotate and move deeper in the axial direction of the borehole (6), while the drilling fluid serves the drill head (53) through an inlet (13) for drilling mud in the first drilling machine (1);
b) an actuator (32) of rotation, coupled with a rotary table (31) in the second drilling machine (3) is driven to rotate at a speed corresponding to the speed of rotation of the drill string (5);
in that the actuator (32) of rotation is connected to the upper part (a) rotating the drillstring (5);
g) closing the airtight seal (342, 344), made in the holes (341, 343) for the drill to�Onna in the liquid chamber (34), installed between the rotary table (31) and the first drilling machine (1), form a hermetic seal support around the part of the drill column (5) or parts of the drive shaft (11), respectively,
characterized in that it comprises the following operations:
d) drive pipe wrench (33) installed in the liquid chamber (34) is driven to rotate at a speed corresponding to the speed of rotation of the drive shaft (11);
(e) drive pipe wrench (33) is introduced into engagement with a portion of the drive shaft (11);
g) reduce the speed of rotation of the drive Tong (33) relative to the rotary table (31) with the provision of disconnecting the drive shaft from the drill string (5) while simultaneously establish fluid connection between the unit (7) for feeding the drilling mud and drill head (53) through the liquid chamber (34) and an open upper end (51) of a drill string, after which the flow of drilling fluid into the first drilling machine (1) cease;
h) a drive shaft (11) is withdrawn from the liquid chamber (34), the first drilling machine (1) is withdrawn from the second drilling machine (3) with shutoff valve (345) is closed, and the upper seal (344) is removed from the drive shaft (11);
I) section (52) of a drill string connected to the drive shaft (11) of the first drilling machine (1) and move in the liquid chamber (34), wherein the upper hermeti�Noe seal (344) is connected to the backwater section (52) of a drill string, and shutoff valve (345) opens;
K) drive pipe wrench (33) is introduced into engagement with a part of the section (52) of the drill string and create the rotation of the section (52) of a drill string with a greater speed than the rotational speed of the drill column (5);
l) drive pipe wrench (33) is moved to the drill string (5) and a connecting section (52) of the drill string with the drill pipe (5), wherein the flow of drilling fluid into the first drilling machine (1) resume, after which the flow of drilling fluid in the liquid chamber (34) stop;
m) resumes the rotation of the first drilling machine (1) and vertical movement of the drill column (5) to drain the drilling fluid from the liquid chamber (34) through the vent hole (351) in the reservoir (74) for drilling mud, and then hermetically seal the free drill column (5); and
h) repeating operations b) - m).



 

Same patents:

FIELD: oil and gas industry.

SUBSTANCE: method includes drilling of a well borehole by an assembly with the lower power drive and usage of a circulation fluid as a drilling mud. A loss zone is entered and drilling is transferred to the drilling mud, at entry to the loss zone rotary assembly or the upper power drive is switched, a drill string is rotated with a rate of 60-90 rev/min, consumption rate of the drilling mud is set equal to 18-20 l/s at the wellhead pressure of 1-2.5 MPa, the drilling mud is used with a viscosity of 60-90 CP, at the entry to the loss zone cuttings are introduced in a quantity up to 30% of the drilling mud volume and in the progress of the loss zone the passage quantity of cuttings in the drilling mud is reduced up to 8-12% at the loss zone end, the well is washed by the drilling mud without cuttings with a viscosity of 40-60 CP, with the consumption rate of 30-35 l/s and the wellhead pressure of 1-2.5 MPa and drilling is continued till the design reference mark.

EFFECT: improved reliability of the loss zone isolation, sticking of drilling tools is excluded.

FIELD: oil and gas industry.

SUBSTANCE: method includes drilling by an assembly with a hydraulic downhole motor, periodical reciprocating of a drilling string in the complicated zone with simultaneous rotating. Drilling is performed by a bit having a diameter of 220.7 mm, a sloughing rock horizon is drilled and the drilling fluid is used with a density of 1.3-1.4 g/cm3, viscosity of 50-90 CP, load to the bit is maintained within limits of 10-15 t, the drilling fluid is injected with a rate of 32-45 l/s, the productive formation is entered to a depth of 1.0-1.5 m with a zenith angle of 75-85 degrees. The sting below assembly is lifted above the sloughing rock horizon, the process is withheld within 1-2 hours, and the assembly is lifted from the well, logging survey is performed and the same assembly is run in. At running in the setting intervals are worked out, the assembly is lifted out of the well, the production string is run in to the bottomhole with a lower section of casing pipes, a docking device and an upper section of drill pipes, the borehole annulus of the lower section is cemented, the upper section is disconnected from the docking unit, the upper section of the drill pipes is lifted and the casing string with a diameter of 177.8 mm is run with the length from the docking device up to the wellhead, the strings are lined up and the borehole annulus is cemented. A packed-hole assembly with a bit of a diameter of 155.5 mm is run in inside the production string, the interval of the sections line-up is worked out and drilling of the productive formation is continued.

EFFECT: excluded sticking of drilling tools when passing the well through complicated zones.

Drilling rig // 2541972

FIELD: oil and gas industry.

SUBSTANCE: invention is referred to drill rigs with movable rotary mechanism used for drilling of expendable wells. The drill rig includes mast, chain hoist for the string with movable rotary mechanism equipped with hydraulic chuck to retain drill pipes, chain hoist for drill pipe stands with elevator mounted above the chain hoist for the string and equipped with hydraulic chuck to retain drill pipe stands consisting of one or several pipes, carousel arrangement with circumferential cells for drill pipe stands, at that the above arrangement may be moved from the well axis and back, and stationary hydraulic pipe holder. Over chain hoist for the string with movable rotary mechanism there is identical chain hoist with movable straight-way making-up pipe holder coupled kinematically to the above one through two pairs of drive gear and having common reversible drive with it, in result when movable rotary mechanism moves upwards the making-up pipe holder moves downwards and vice a versa, a drill pipe stand pipe disconnected and connected to the string is taken by its upper end by hydraulic chuck of the elevator of chain hoist for drill pipe stands with elevator and removed from the carousel arrangement or accumulated in it with potential automation and synchronisation of operation for all elements the drill rig and alignment in time of working and idling operations for running in and out of drilling string and drill pipe stands as well delivery of the latter from the string to accumulation site and back. The drill rig provides drilling of wells with bore inclination at angle of 45-90° to the horizon.

EFFECT: sufficient reduction in duration of auxiliary operations of the drilling string run in and out is ensured due to their alignment in time.

4 cl, 4 dwg, 1 tbl

FIELD: oil and gas industry.

SUBSTANCE: invention is related to drilling, and namely to water extraction from bore wells using the well drilling device by percussion rotary drilling. The well drilling device by percussion rotary drilling comprises a chisel weight magnifier installed directly over the chisel - above-chisel bit weighting material - fixed to the drill stem and the chisel bit by means of adaptors. The chisel weight magnifier is made as a section of casing pipe, which can be installed at the drill pipe thrusted to the adaptor that connects the drill pipe with a chisel bit at the one side and connection by the adaptor with the drill string at the other side, at that the casing pipe section is centred in regard to the drill pipe by means of protective couplings while the space between these pipes is filled with lead pellet.

EFFECT: improved efficiency of well drilling due to increased rate of drilling.

2 dwg

FIELD: mining.

SUBSTANCE: device includes a drilling bit weight enlarging mechanism installed immediately above the drilling bit - an above-bit weighting device - and attached to a drill string and to the bit by means of adapters. The bit weight enlarging mechanism is made in the form of a piece of a casing pipe that can be installed on a drill pipe so that it is borne against an adapter attaching the drill pipe to the bit on one side and connected by means of the adapter to the drill string on the other side; with that, a piece of the casing pipe is aligned relative to the drill pipe by means of safety couplings, and space between these pipes is filled with lead shots and electrorheological liquid and equipped with an electric field creation device increasing viscosity of electrorheological liquid when striking on the bit.

EFFECT: improving well drilling efficiency due to increase of driving speed.

2 dwg

FIELD: mining.

SUBSTANCE: drilling tool comprises a drill bit (2) connected to the drill rod (1) by a connector (3) of the drill bit. The drill rod is made of sections (11) of the drill rod. Each section of the drill rod comprises an inner section (111) of the rod and a hollow outer section (112) of the rod. The inner section of the rod is fixed with the ability of rotation in the outer rod section. The inner rod sections are joined together and form the inner rod (11') of the drill rod. The outer rod sections are connected together and form the outer rod (12') of the drill rod. The inner rod is connected to the output shaft of the power unit, and the outer rod is rigidly connected to the housing of the power unit.

EFFECT: reduction of friction force between the drill rod and the borehole wall.

14 cl, 7 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: invention relates to drilling. Method of drilling the inclined and horizontal wells in highly porous rocks comprises generation of pressure difference in well-formation system by changing the flushing fluid density. To increase drilling rate by differential use of pressure difference range, additional pressure difference is created by increasing flushing fluid density.

EFFECT: higher rate of drilling.

4 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: at construction of production well, vertical shaft is drilled through rocks, including unstable mud shale, with entry into productive seam, going-in of production string to productive seam, cementing of annular space and drilling the shaft from production string into productive seam. At exposure of horizon with unstable mud shale, mechanical drilling rate is set not over 6 m/h for drilling with increased flushing fluid flow rate of about of 30-40 l/s using drilling solutions with density of 1.12-1.40 g/cm3. After well shaft drilling, drilling assembly performs cleanup job over well shaft with working of the shaft by rotary machine at rotor rpm of 40-100 rpm. Drilling fluid mixed with fibres in amount of 6-15 m3 is forced through the shaft and drill assembly reciprocates over the length of drive pipe. For well shaft casing operation string is lowered section-by-section. First 400-1000 m long section is lowered to well bottom on drill tool and annular space if cemented in interval from bottom to first section head. Cement is cured to lower production string second section. Sections are coupled, annular space is cemented and cement is cured. Production string is sealed.

EFFECT: ruled out sticking of drill tool in drilling unstable mud shale.

2 cl, 3 ex

FIELD: mining.

SUBSTANCE: proposed plant comprises mobile running gear and drive hardware not including the ICE. Drive hardware comprises drive motor, elements to transfer power between drive motor and drive wheel, electrical system, pressurised working fluid system, jib moving along running gear and equipped with rock drilling machine and control unit. Control unit incorporates systems control algorithm. Drive motor serves as the generator and the main brake at long-term motion over the slope. Control unit can control electrical system and electric power generated at downslope motion for charging of storage battery. Proposed method consists in plant braking at long-term motion over the slope by drive motor solely. Storage battery is charged. Electric power is converted to pressure energy in response to demand in excess power, increasing the plant maximum speed at downslope motion.

EFFECT: efficient distribution of electric power at downslope motion.

15 cl, 5 dwg

FIELD: mining.

SUBSTANCE: set of inventions relates to drilling plant positioning and to drilling plant. Proposed method consists in displacing the drilling plant over the rock by driving equipment without ICE. Drive motor generates required torque to be transmitted via mechanical gearing to drive wheel. Drilling plant is positioned by rock at drilling site in the case of rough or inclined surface of motion. Motor is used for displacement and stoppage of the plant at positioning. Ratio between drive motor rpm and drive wheel rotary speed at displacement of the plant at positioning is kept constant irrespective offload variation by torque. Rock drilling plant comprises carrier, drive equipment without ICE. Drive equipment comprises drive motor, control device, gearing elements, manipulator jug, rock drilling machine, control unit, mechanical gearing with antiskid component between drive motor and drive wheel and speed measuring device.

EFFECT: higher accuracy of positioning.

20 cl, 7 dwg

FIELD: construction.

SUBSTANCE: invention relates to construction and processing (deactivation) of drilling wastes together with secondary wastes of thermal utilisation of oil slurries with ash and slag mixtures so that road-building composite materials are obtained. The task at which this invention is aimed is to create a processing method of drilling wastes on the territory of a cluster site. The processing method of drilling sludge on the territory of the cluster site involves arrangement at the site of components of the mixture and a processing capacity, placement of drilling sludge into the capacity, addition to the sludge of components and mixing of the mixture with an excavator so that road-building composite material is obtained; with that, the processing capacity is installed into soil so that its upper edge is elevated above relief to the height of not more than 0.5 m.

EFFECT: reduction of costs for transportation of wastes to the nearest sludge pit, a possibility of processing of drilling wastes immediately after their formation, a possibility of using secondary materials obtained as a result of processing at the site.

6 cl, 7 dwg

FIELD: process engineering.

SUBSTANCE: set of inventions relates to drilling. Proposed system comprises the components that follow. Downhole device for decreasing of drill string vibration and injection and superhigh-pressure drill bit for downhole injector. Said downhole device for decreasing of drill string vibration and injection includes high-pressure channel. Said superhigh-pressure drill bit comprises channel to transfer superhigh-pressure mud fluid. Said channel to transfer superhigh-pressure mud fluid comprises superhigh-pressure mud fluid channel, high-pressure hose and high-pressure stiff pipe. Said high-pressure channel communicates with superhigh-pressure mud fluid transfer channel. One end of said high-pressure hose is connected with said superhigh-pressure mud fluid channel while opposite end of said hose is connected with high-pressure stiff pipe. Opposite end of said high-pressure stiff pipe is connected with superhigh-pressure mud fluid nozzle. Method for decreasing of drill string vibration uses the source of power generated by pressure oscillation at drill bit body. Besides, it exploits mud fluid forced into downhole device for decreasing of drill string vibration and injection after shunting by shunting mechanism. Note here that major part of mud fluid is forced through common pressure nozzle. Mud fluid remainder is forced to power converter via intake one-way valve in said downhole device for decreasing of drill string vibration and injection. Power source and power produced thereby are used to release mud fluid minor portion via discharge one-way valve connecting the high-pressure channel. Besides, superhigh-pressure mud fluid nozzle generates superhigh-pressure jet to facilitate rock destruction directly or indirectly. Power converter is composed of seal assembly, injection cylinder and cylinder guide bush.

EFFECT: higher rate of drilling, stability, reliability and safety.

13 cl, 11 dwg

FIELD: oil and gas industry.

SUBSTANCE: method includes drilling of a well borehole by an assembly with the lower power drive and usage of a circulation fluid as a drilling mud. A loss zone is entered and drilling is transferred to the drilling mud, at entry to the loss zone rotary assembly or the upper power drive is switched, a drill string is rotated with a rate of 60-90 rev/min, consumption rate of the drilling mud is set equal to 18-20 l/s at the wellhead pressure of 1-2.5 MPa, the drilling mud is used with a viscosity of 60-90 CP, at the entry to the loss zone cuttings are introduced in a quantity up to 30% of the drilling mud volume and in the progress of the loss zone the passage quantity of cuttings in the drilling mud is reduced up to 8-12% at the loss zone end, the well is washed by the drilling mud without cuttings with a viscosity of 40-60 CP, with the consumption rate of 30-35 l/s and the wellhead pressure of 1-2.5 MPa and drilling is continued till the design reference mark.

EFFECT: improved reliability of the loss zone isolation, sticking of drilling tools is excluded.

FIELD: oil and gas industry.

SUBSTANCE: while implementing the method a tubing string is run in to a well up to a bottomhole with a tube having a diameter more than the diameter of the tubing string with triangular windows and inner sharp tabs faced upwards under an angle of 25-30° to the vertical, circulation of the borehole fluid with a consumption rate within limits from 3.5 up to 8 l/s through the annular space, tube and tubing string through a holding tank in the volume not less than the well volume and lifting of the tubing string with the tube from the well.

EFFECT: raised efficiency of the well cleaning.

1 dwg

FIELD: oil and gas industry.

SUBSTANCE: method includes drilling of a well, running in of a production string to a horizontal part of the well with a mud-inflatable packer, a stop ring and a stage cementing collar at the end, injection of the cement grout to the annular space, the process withhold for the time of the cement hardening, drilling of the stop ring and collar and the well development. At running in the production string is stopped at a distance from the bottomhole, drilling of the stop ring and collar is made with the usage of a drilling fluid with a density from 1.20 up to 1.25 g/cm3, it is injected with a rate of 18-21 l/s at a pressure of 8-10 MPa at the wellhead. The interval from the production string end till the bottomhole is worked out by a bit, the well is washed by the drilling fluid at a wellhead pressure of 8-10 MPa, a filtering string of a low diameter is run in through the production string and an interval from the bottomhole until the production string is covered with partial covering of the production string end; the filtering string remains in the interval of the productive formation. At running in the production string is stopped at a distance from the bottomhole equal to 50-150 m. Partial covering of the production string end by the filtering string is made per 5-10 m.

EFFECT: increased well productivity.

3 cl

FIELD: oil and gas industry.

SUBSTANCE: method includes drilling by an assembly with a hydraulic downhole motor, periodical reciprocating of a drilling string in the complicated zone with simultaneous rotating. Drilling is performed by a bit having a diameter of 220.7 mm, a sloughing rock horizon is drilled and the drilling fluid is used with a density of 1.3-1.4 g/cm3, viscosity of 50-90 CP, load to the bit is maintained within limits of 10-15 t, the drilling fluid is injected with a rate of 32-45 l/s, the productive formation is entered to a depth of 1.0-1.5 m with a zenith angle of 75-85 degrees. The sting below assembly is lifted above the sloughing rock horizon, the process is withheld within 1-2 hours, and the assembly is lifted from the well, logging survey is performed and the same assembly is run in. At running in the setting intervals are worked out, the assembly is lifted out of the well, the production string is run in to the bottomhole with a lower section of casing pipes, a docking device and an upper section of drill pipes, the borehole annulus of the lower section is cemented, the upper section is disconnected from the docking unit, the upper section of the drill pipes is lifted and the casing string with a diameter of 177.8 mm is run with the length from the docking device up to the wellhead, the strings are lined up and the borehole annulus is cemented. A packed-hole assembly with a bit of a diameter of 155.5 mm is run in inside the production string, the interval of the sections line-up is worked out and drilling of the productive formation is continued.

EFFECT: excluded sticking of drilling tools when passing the well through complicated zones.

FIELD: oil and gas industry.

SUBSTANCE: method comprises the creation of drilling fluid circulation using the direct layout of washover by pumping through the drilling pipe string with bit, lowered into a well of main drilling fluid and drilling fluid with viscosity, ensuring the increased cutting-carrying capacity. An aerated flush fluid is used as a drilling fluid. During washover with aerated flush fluid the drilling pipes are lowered at the axial speed 20 m/h and at rotational speed 40 rpm. After passing of each 5 m the string lowering is paused and it is raised by 2 meters, the circulation with aerated flush fluid is performed at increased flow rate during 15 minutes, then the lowering is continued. Polymeric bars from acrylic copolymer, soluble paper and soluble cork soluble in aerated flush fluid are used as a drill fluid with the increased cutting-carrying capacity. Bars are thrown off into the pipe string from the wellhead at extension of each pipe of the drill column, starting from the interval of build angle of open borehole above higher 40 degrees at washover of horizontal well and until achievement of the open borehole foot.

EFFECT: washover performance, drilling fluid stability is increased, probability of differential sticking of the string is decreased.

2 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: device comprises cylindrical case with inner cavity, thrust ring and valve. Said cylindrical case can be secured to tubing. Note here that case thrust ring has high-pressure channel for hydraulic communication of cylindrical cavity with hole annuity. Half the circumference of cylindrical case bottom end is composed by saw-like ripper while another half has skew cut. Case thrust ring on ripper side has at least two high-pressure channels, aligned with case axis. Hole is made in the case thrust ring on skew cut side, off centre of case axis. Valve arranged inside the case opposite said bore to allow the down-up flow is composed of valve box with ball fitted in thrust ring bore. Valve box is rigidly secured to thrust ring.

EFFECT: higher reliability and efficiency of flushing.

3 dwg

FIELD: oil and gas industry.

SUBSTANCE: method includes flow string running to the borehole bottom with a wing at the end till it gets into sump contamination, pumping of flushing fluid through the string and its withdrawal through borehole tubular annulus. A ripper is made at the lower end wind. Inside the wing there is a partition with openings of smaller diameter made off-centre over the ripper. Opposite the openings of smaller diameter in the partition there is an opening of a bigger diameter and a return valve with a valve cage is installed over the partition, at that the valve passes fluid bottom upwards. The flow string is run in to the well; rotation of the flow string is made simultaneously with injection of flushing liquid through openings of smaller diameter and liquid lifting through tubular annulus. The return valve is closed. Rotation of the flow string with injection of flushing liquid is continued till the tubing hanger is unloaded in place per 10 kN. Then rotation and injection are stopped. Flushing direction is changed and flushing liquid is injected through tubular annulus under pressure that does not exceed the permitted value. Ripped and eroded sludge is lifted through the flow string till weight of the tubing hanger is recovered. Working operations are repeated.

EFFECT: improved efficiency and reliability of flushing.

2 dwg

FIELD: oil and gas industry.

SUBSTANCE: invention is related to power supply system of borehole surface system assembly. The power supply system of a borehole surface system assembly contains at least one primary engine interconnected to fuel source supplying the primary engine and containing at least one heat source, at least one pump driven by the primary engine interconnected to at least one borehole and at least one fluid used in the borehole and at least one auxiliary system interconnected to the heat source from at least one primary engine. At that the auxiliary system contains a heat exchanger designed to transfer heat from the heat source to the fluid in order to separate one part of the fluid from the other part in at least one borehole.

EFFECT: improving efficiency, flexibility and productivity of the power supply system of a borehole surface system assembly.

20 cl, 5 dwg

FIELD: oil and gas industry.

SUBSTANCE: claimed group of inventions is related to method and device for round-trip well operations. The device for drill string running and pulling in a well comprises at least two pulling-and-running devices. Pulling-and-running devices are installed near opening at the drill site intended for string receipt. Notwithstanding one or several more pulling-and-running devices each pulling-and-running device is made to fix the string or the string section and to move the string or the string section in axial direction as well as to rotate the string section around its axis during axial movement. Each pulling-and-running device is equipped with pipe grab installed over opening at the drill site and made to move the string in axial direction. The pipe grab comprises a unit that ensures detachable connection with the string, prevents its rotation and a unit that is installed at or close to the string end and made to prevent rotation of the string section around its axis and to move the string section in axial direction. At that units of the pipe grab are made so that they may be removed from motion path of one or several running-and-pulling devices.

EFFECT: invention ensures reduction of round-trip time and improvement of automatic control over these operations.

5 cl, 2 dwg

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