CN117967229A

CN117967229A - Rotatable hydraulic machinery double-acting releasing process pipe column and method

Info

Publication number: CN117967229A
Application number: CN202410053905.9A
Authority: CN
Inventors: 梁晓阳; 李富平; 李振; 张国安; 王信鹏; 逄建鑫
Original assignee: Shelfoil Petroleum Equipment & Services Co ltd; China Petroleum and Chemical Corp; Sinopec Petroleum Engineering Technology Research Institute Co Ltd
Current assignee: Shelfoil Petroleum Equipment & Services Co ltd; China Petroleum and Chemical Corp; Sinopec Petroleum Engineering Technology Research Institute Co Ltd
Priority date: 2024-01-15
Filing date: 2024-01-15
Publication date: 2024-05-03

Abstract

The invention provides a rotatable hydraulic mechanical double-acting releasing process pipe column and a method, wherein the pipe column comprises the following components: a release tool disposed between the drilling tool and the rotary liner hanger; the releasing tool is configured to release the release through a pressurizing mode, and when the condition that the release tool cannot be pressurized is met, the release can be realized through a mechanical rotation mode. According to the invention, through a mechanical and hydraulic double-acting releasing structure, and the drilling tool and the tail pipe hanger are connected by using special threads, the stop block integrates the traditional limiting bearing and new back-off releasing functions, so that the risk of releasing the traditional hydraulic releasing tool in advance is avoided.

Description

Rotatable hydraulic machinery double-acting releasing process pipe column and method

Technical Field

The invention relates to a rotatable hydraulic mechanical double-acting releasing process pipe column and a method, and belongs to the technical field of oil and gas well drilling and completion.

Background

With the development of drilling and completion technology to deep land and deep water, ultra-deep wells have become one of the bottlenecks restricting oil resource exploitation, and especially in the process of ocean resource exploration and development, rotary liner hangers have become indispensable cementing tools for improving the cementing quality. Because the rotary liner hanger requires a rotary string during casing running and cementing, the release structure of the rotary liner hanger cannot be achieved by a forward rotating string as in conventional liner hangers.

The current rotary tail pipe hanger uses hydraulic release, and by pressing down the pipe column and matching with the pressure build-up in the pipe, the release shear pin is sheared off, and the elastic claw is released. In the process of casing running, if the structure is lifted and lowered when meeting a blockage, the risk of early hand-off exists, and the tail pipe can drop into the bottom of the well to influence the well cementation construction.

Therefore, it is necessary to provide a releasing structure suitable for deep and deep water well cementation rotary liner hanger, which solves the problem of early releasing in the casing running process.

Disclosure of Invention

Aiming at the technical problems in the prior art, the invention provides a rotatable hydraulic mechanical double-acting releasing process pipe column and a method.

According to one aspect of the present invention, there is provided a rotatable hydromechanical double-acting release process string comprising:

A release tool disposed between the drilling tool and the rotary liner hanger;

the releasing tool is configured to release the release through a pressurizing mode, and when the condition that the release tool cannot be pressurized is met, the release can be realized through a mechanical rotation mode.

A further improvement of the present invention is that the tubing string further comprises:

The guide shoe and the floating hoop are used for guiding the sleeve to be put in;

The casing string is arranged at the upper end of the floating hoop to form a main body of the pipe column;

the lower end of the rotary tail pipe hanger is connected with a casing string, and the upper end of the rotary tail pipe hanger is connected with a drilling tool through the releasing tool;

the drilling tool is lifted after well cementation; and

The rotary cement head is positioned at the wellhead, the upper part of the rotary cement head is connected with the top drive, the lower part of the rotary cement head is connected with the drilling tool, the drill rod rubber plug is internally installed, the drill rod rubber plug can be released in the well cementation process, and the rotary cement head can be driven to rotate through the top drive.

The invention is further improved in that the releasing tool is provided with a stop block type back-off nut, and the stop block type back-off nut is configured to support the up-and-down connection of the releasing tool;

The stop block type back-off nut is contracted in a hydraulic mode to realize releasing, and the back-off nut can also be rotated in the outer side of the stop block type back-off nut to realize releasing.

A further improvement of the present invention is that the release tool comprises:

an upper joint for connecting an upstream component;

The lower joint is connected with the upper joint through threads;

A housing disposed at a lower end of the lower joint, the housing being connected to a downstream component;

Wherein, the lower joint is connected with the shell through the stop block type back-off nut.

The invention is further improved in that a hydraulic cylinder is arranged on the lower joint, a piston is arranged in the hydraulic cylinder, and a plurality of grooves are formed in the outer side of the piston;

the outer side of the stop block type back-off nut is provided with a back-off thread connected with the shell, and the inner side of the stop block type back-off nut is provided with a stop block matched with the groove;

The method comprises the steps that in the initial process, the piston is in a first position, the groove is staggered with the stop block, so that the piston supports the stop block type back-off nut to be in a stretching state, and the stop block type back-off nut is connected with the shell through back-off threads;

under the action of hydraulic pressure, the piston moves to a second position, and the stop block enters the groove, so that the stop block type back-off nut is separated from the shell, and releasing is completed.

The stopper integrates the traditional spacing bearing and new back-off releasing function, avoids traditional hydraulic releasing tool to release in advance the risk.

The invention is further improved in that the lower joint is provided with a pressure transmission hole communicated with the hydraulic cylinder, and the piston is connected with the hydraulic cylinder through a shear pin at a first position in the initial stage;

By pressurizing within the tubing string, pressure enters the hydraulic cylinder through the pressure transfer port and shears the shear pin, causing the piston to move from the first position to the second position.

The invention is further improved in that the hydraulic cylinder is provided with the bow piece, one end of the bow piece is fixedly connected with the hydraulic cylinder, and the other end of the bow piece is propped against one side of the stop block type back-off nut.

The invention further improves that the lower joint is provided with a torque sleeve, and the torque sleeve is connected with the shell through unidirectional meshing teeth, so that the torque sleeve and the shell can rotate anticlockwise relative to each other in a single way.

The invention further improves that a spring is arranged on the outer side of the upper part of the lower joint, one side of the spring is connected with a torque sleeve, and the other side of the spring is connected with the upper joint.

A further improvement of the invention is that a flat surface is provided on the outer wall of the lower joint, which flat surface cooperates with the torque sleeve and the hydraulic cylinder.

The invention is further improved in that the bottom of the lower joint is provided with a load supporting disc, and the lower joint transmits pressure to the shell through the load supporting disc;

and a bearing is arranged between the lower joint and the load supporting disc, and the load supporting disc is limited by a locking ring.

According to another aspect of the invention, a double-acting releasing method of the rotary hydraulic machinery is also provided, and the rotatable double-acting releasing process pipe column of the hydraulic machinery is released by means of mechanical rotation and hydraulic pressure.

A further improvement of the invention is that the method comprises:

Installing the double-acting releasing process pipe column of the rotary hydraulic machine,

In the process of pipe column running, the drilling tool is rotated clockwise to drive the whole pipe column to rotate so as to reduce friction in the process of casing running;

After the pipe column is put in place, the pressure is built in the pipe, and releasing is completed;

if the pressure cannot be held down due to the underground special condition, the pipe column can be rotated anticlockwise, and releasing is realized.

Compared with the prior art, the invention has the advantages that:

according to the rotatable hydraulic mechanical double-acting releasing process pipe column and the method, through the mechanical and hydraulic double-acting releasing structure, meanwhile, the drilling tool is connected with the tail pipe hanger through special threads, and the risk of releasing in advance is avoided.

The rotatable hydraulic mechanical double-acting releasing process pipe column and the method are used for solving the problems of difficult casing welting and running, uneven well cementing cement rings, poor displacement efficiency, mixing of drilling fluid and cement slurry, direct reduction of well cementing quality, short service life of a well shaft and the like in the prior art in the deep and deep oil gas development process, particularly in the ultra-deep horizontal well cementing construction process. Through the rotary liner cementing process, friction resistance in the casing pipe setting process is reduced, so that the casing pipe is smoothly put in place; and when in well cementation, the tail pipe is rotated, the liquid state is changed, the displacement efficiency is improved, and the cement paste sealing quality is improved.

According to the rotatable hydraulic mechanical double-acting releasing process pipe column and the method, when the sleeve is blocked in the process of being put into, the sleeve is lifted up and put down to be matched with the rotary tail pipe for unblocking, the risk of the elastic claw structure being released in advance is avoided through the stop block type threaded connection, and the safety of being put into the sleeve is improved; meanwhile, after the hydraulic release fails, the emergency mechanical release can be performed by rotating the pipe column anticlockwise, so that the construction safety is improved.

Drawings

Preferred embodiments of the present invention will be described in detail below with reference to the attached drawing figures, wherein:

FIG. 1 is a schematic diagram of a rotatable hydromechanical double-acting release process string according to an embodiment of the invention;

FIG. 2 is a schematic view of a release tool according to one embodiment of the present invention, showing an initial state;

FIG. 3 is a schematic view of a release tool according to one embodiment of the present invention, showing the shear pin in a sheared state;

FIG. 4 is a schematic view showing the construction of a releasing tool according to an embodiment of the present invention, showing a state in which releasing is completed by hydraulic pressure;

FIG. 5 is a schematic view showing the construction of a releasing tool according to an embodiment of the present invention, showing a state in which releasing is accomplished mechanically;

FIG. 6 is a schematic illustration of the construction of a torque-carrying sleeve according to one embodiment of the present invention, shown in side cross-section;

FIG. 7 is a schematic view of a torque-carrying sleeve according to one embodiment of the present invention, shown in a perspective view;

FIG. 8 is a schematic view showing the structure of a lower joint according to an embodiment of the present invention;

FIG. 9 is a schematic diagram of a hydraulic cylinder showing a side cross-sectional view of an embodiment of the present invention;

FIG. 10 is a schematic view showing the structure of a hydraulic cylinder according to an embodiment of the present invention, showing a three-dimensional state;

Fig. 11 is a schematic structural view of a stop-type back-off nut according to an embodiment of the present invention.

The figures are not drawn to scale.

The meaning of the reference numerals in the drawings is as follows:

1. Rotary cementing head, 2, drilling tool, 3, releasing tool, 4, rotary liner hanger, 5, casing string, 6, float collar, 7, rotary guide shoe, 301, upper joint, 302, spring, 303, lower joint, 304, torque bearing sleeve, 305, hydraulic cylinder, 306, shrink snap spring, 307, bow piece, 308, shear pin, 309, stop-type back-off nut, 310, piston, 311, pressure transmitting hole, 312, bearing, 313, load supporting disc, 314, locking ring, 315, and housing.

Detailed Description

In order to make the technical solution and advantages of the present invention more apparent, exemplary embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. It will be apparent that the described embodiments are only some of the embodiments of the present invention and are not exhaustive of all embodiments. And embodiments of the invention and features of the embodiments may be combined with each other without conflict.

In the embodiment shown in fig. 1, a rotatable hydromechanical double-acting lost motion process string comprises:

a release tool 3, the release tool 3 being arranged between the drilling tool 2 and the rotary liner hanger 4;

Wherein, the releasing tool 3 is configured to realize releasing by pressurization, and when the condition that pressurization is impossible is met, releasing can be realized by mechanical rotation.

In the rotatable hydromechanical double-acting releasing process pipe string according to the embodiment, the releasing tool 3 is arranged between the drilling tool 2 and the rotary liner hanger 4, and the whole pipe string sequentially comprises the rotary guide shoe 7, the float collar 6, the casing string 5, the rotary liner hanger 4, the releasing tool 3, the drilling tool 2 and the rotary cementing head 1 from bottom to top.

The floating shoes 6 are used for guiding the sleeve to go in and have the function of forward overflow and reverse sealing.

And the casing pipe forms a basic unit of the pipe column.

The liner hanger 4 is rotated, the lower part is connected with a sleeve, the upper part is connected with the drilling tool 2, the liner hanger can rotate when being put into well cementation, and the sleeve is hung on an outer sleeve after being put in place, so that the liner cementation is realized.

The drilling tool 2, the lower part of which is connected with a double rubber plug system and a tail pipe hanger 4, is put forward after well cementation.

The rotary cement head 1 is positioned at a wellhead, the upper part is connected with a top drive, the lower part is connected with a drilling tool 2, a drill rod rubber plug is internally installed, the drill rod rubber plug can be released in the well cementation process, and the top drive can be used for driving the rotary cement head to rotate.

The releasing tool 3 can realize releasing in a mode of pressurizing in a pipe in a normal state, so that the drilling tool 2 and the rotary liner hanger 4 are separated, and when the condition that the pressure cannot be applied is met, releasing can be realized in a mechanical rotation mode, and the releasing effect is ensured in two modes.

In one embodiment, as shown in fig. 2, the releasing tool 3 is provided with a stop-type back-off nut 309, and the stop-type back-off nut 309 is configured to support the up-down connection of the releasing tool 3, and also can be contracted in a hydraulic manner to fail the up-down connection of the releasing tool 3, so as to complete releasing; the stop-type back-off nut 309 also includes back-off rotation on the outside to effect release.

The embodiment innovates a mechanical and hydraulic double-acting releasing structure, and meanwhile, the drilling tool 2 and the tail pipe hanger 4 are connected through special threads, so that the risk of releasing in advance is avoided. The structure can solve the problems of poor sealing quality caused by the fact that a cement sheath is not centered and cement paste is uneven in the process of cementing a deep well and a horizontal well, and improves the displacement efficiency and the cementing quality, thereby effectively ensuring the integrity of a shaft and prolonging the service life.

The stop block type back-off nut integrates limiting bearing and back-off releasing functions, and the risk of advanced releasing of the traditional hydraulic releasing tool is avoided

In one embodiment, the release tool 3 comprises:

an upper sub 301, said upper sub 301 being adapted to connect an upstream component, such as a drilling tool 2.

The lower joint 303 is screwed to the upper joint 301 and seals the liquid pressure by a rubber ring.

And a housing 315 arranged at the lower end of the lower connector 303, wherein the lower connector 303 is connected with the housing 315 through a stop-type back-off nut 309.

The stop-type back-off nut 309 may be separated from the housing 315 by pressing or mechanical rotation to complete the release.

In one embodiment, as shown in fig. 2, a hydraulic cylinder 305 is disposed on the lower joint 303, a piston 310 is disposed in the hydraulic cylinder 305, a plurality of grooves are disposed on the piston 310, the outer side of the stop-block type back-off nut 309 is a back-off thread (the back-off thread is preferably a coarse-tooth right-handed thread and is matched with a coarse-tooth left-handed thread in the housing 315), and a stop is disposed on the inner side, and the shape and size of the stop are matched with those of the grooves on the piston 310.

Initially, as shown in fig. 2, the piston 310 is in the first position on the hydraulic cylinder 305, where the recess of the piston 310 is offset from the stop of the stop-type back-off nut 309, and the piston 310 can support the stop-type back-off nut 309 in a spread state, and the stop-type back-off nut 309 is connected to the housing 315 by a back-off thread.

Under the action of pressure, as shown in fig. 3, piston 310 moves to a second position within cylinder 305, at which point the recess of piston 310 moves to the stop position of stop-block back-off nut 309, and the stop enters the recess, thereby separating stop-block back-off nut 309 from housing 315, completing the release, as shown in fig. 4.

When the situation that pressurization is impossible is met, releasing can be achieved in a mechanical rotation mode, and as shown in fig. 5, the releasing effect is guaranteed in two modes.

In one embodiment, the lower connector 303 is provided with a pressure transmitting hole 311 which communicates with the hydraulic cylinder 305, and the piston 310 is initially in the first position and is connected to the hydraulic cylinder 305 by a shear pin 308. The piston 310 is prevented from advancing by the provision of the shear pin 308.

At this time, the piston 310 is at the first position, the groove of the piston 310 is staggered with the stopper of the stopper-type back-off nut 309, the piston 310 can support the stopper-type back-off nut 309 in a spread state, and the stopper-type back-off nut 309 is connected with the housing 315 through back-off threads.

When the pressure in the pipe column is increased, the pressure in the pipe column enters the hydraulic cylinder 305 through the pressure transmission hole 311, and when the pressure reaches a certain value, the shear pin 308 shears under the action of the pressure, so that the piston 310 moves from the first position to the second position.

At this time, the groove of the piston 310 moves to the stop position of the stop-type back-off nut 309, and the stop enters the groove, so that the stop-type back-off nut 309 is separated from the housing 315, and releasing is completed.

In one embodiment, the hydraulic cylinder 305 is provided with an arcuate piece 307, one end of the arcuate piece 307 is fixedly connected with the hydraulic cylinder 305, and the other end abuts against one side of the stop-type back-off nut 309.

In this embodiment, the left end of the bow 307 is welded to the hydraulic cylinder 305, and the right end is pressed against the outer side of the stopper-type back-off nut 309, and can be freely extended and contracted.

The tab 307 provides a certain elastic force to the stop-type back-off nut 309, and when the piston 310 moves from the first position to the second position, the stop-type back-off nut 309 is contracted by the pushing action of the elastic force of the tab 307, so that it is contracted into the groove of the piston 310.

In one embodiment, as shown in fig. 6 and 7, the lower connector 303 is further provided with a torque sleeve, which is located above the housing 315 and is sleeved outside the hydraulic cylinder 305, so as to transmit torque and protect the hydraulic cylinder 305.

The torque sleeve is connected with the housing 315 through unidirectional meshing teeth, so that the torque sleeve and the housing 315 can rotate anticlockwise relative to each other in a single item.

In a preferred embodiment, the unidirectional engaging teeth may have a plurality of concave-convex structures, and one side of each concave-convex structure is a smooth inclined surface, so that the unidirectional engaging teeth can slide smoothly and relatively when rotating anticlockwise; the other side is right-angled or chamfered, so that the torque is transmitted clockwise.

In one embodiment, as shown in fig. 8, a flat surface is provided on the outer wall of the lower connector 303, and the flat surface cooperates with the torque sleeve and the hydraulic cylinder 305.

In one embodiment, the bottom of the lower joint 303 is provided with a load support plate 313, and the lower joint 303 transmits pressure to the housing 315 through the load support plate 313;

a bearing 312 is arranged between the lower joint 303 and the load support plate 313, and the load support plate 313 is limited by a locking ring 314.

According to the rotatable hydromechanical double-acting releasing process pipe column, the rotatable hydromechanical double-acting releasing process pipe column mainly comprises a rotary guide shoe 7, a float collar 6, a casing string 5, a rotary liner hanger 4, a releasing tool 3, a drilling tool 2 and a rotary cementing head 1 from bottom to top.

The upper part of the releasing tool 3 is provided with a drill rod buckle, the lower part is provided with a sleeve buckle, and the rotary tail pipe hanger 4 is connected with the drilling tool 2 through the releasing tool 3. The upper joint 301 is screwed with the lower joint 303 and seals the liquid pressure by a rubber ring.

The lower joint 303 is connected to the housing 315 by a stop-type back-off nut 309. The left side of the outer circle of the lower joint 303 is machined with a symmetrical plane to transmit torque, and the symmetrical plane is matched with the plane of the inner holes of the torque sleeve 304 and the hydraulic cylinder 305. The lower portion of the torque sleeve 304 and the upper portion of the housing 315 are designed with special meshing teeth that allow only a single counter-clockwise relative rotation.

In this embodiment, 4 grooves are formed in the circumferential direction of the hydraulic cylinder 305, as shown in fig. 9 and 10, the grooves are sized to accommodate the stopper-type back-off nut 309, the left end of the arcuate piece 307 is welded to the hydraulic cylinder, and the right end is pressed against the outer side of the stopper-type back-off nut 309 to be freely retractable.

As shown in fig. 11, a special groove is formed in the inner hole of the stop-type back-off nut 309, the special groove is engaged with the piston 310 after sliding, a rough-tooth right-handed thread is formed on the outer circle of the stop-type back-off nut 309 and matched with a rough-tooth left-handed thread in the housing 315, the processed thread is cut into 4 parts along a circumferential line, and the 4 parts are installed in the 4 grooves of the hydraulic cylinder 305 according to the relative positions before cutting.

The hydraulic cylinder 305 is fixedly connected to the piston 310 by a shear pin 308. The inside of the hydraulic cylinder 305 is provided with a shrinkage snap spring 306, and the lower joint 303 is circumferentially provided with 2 pressure passing holes 311. The lower joint 303 transfers pressure to the housing 315 via the load support plate 313, wherein bearings 312 are designed between the lower joint 303 and the load support plate 313 to reduce friction forces generated by relative rotation. The load support plate 313 is restrained by a locking ring 314.

According to the rotatable hydraulic mechanical double-acting releasing process pipe column and the method, through the mechanical and hydraulic double-acting releasing structure, the drilling tool 2 and the tail pipe hanger 4 are connected through special threads, and the risk of releasing in advance is avoided.

According to the rotatable hydraulic mechanical double-acting releasing process pipe column and method, the problems that in the deep and deep oil gas development process, particularly in the ultra-deep horizontal well cementing construction process, the casing is difficult to put in due to the fact that the casing is stuck, the well cementing cement rings are uneven, the displacement efficiency is poor, drilling fluid and cement slurry are mixed, the well cementing quality is reduced, the service life of a well shaft is short and the like are solved. Through the rotary liner cementing process, friction resistance in the casing pipe setting process is reduced, so that the casing pipe is smoothly put in place; and when in well cementation, the tail pipe is rotated, the liquid state is changed, the displacement efficiency is improved, and the cement paste sealing quality is improved.

According to the rotatable hydraulic mechanical double-acting releasing process pipe column and the method, when a sleeve is blocked in the process of being put into, the sleeve is lifted up and put down to be matched with a rotary tail pipe for unblocking, the risk of releasing an elastic claw structure in advance is avoided through stop block type threaded connection, and the safety of being put into the sleeve is improved; meanwhile, after the hydraulic release fails, the emergency mechanical release can be performed by rotating the pipe column anticlockwise, so that the construction safety is improved.

According to another aspect of the invention, a double-acting releasing method of the rotary hydraulic machinery is also provided, and releasing is realized by using the rotatable double-acting releasing process pipe column of the embodiment in a mechanical rotation and hydraulic manner.

In one embodiment, the rotary hydromechanical double-acting releasing method comprises the following steps:

In the process of pipe column running, the drilling tool 2 is rotated clockwise to drive the whole pipe column to rotate so as to reduce friction in the process of casing running;

In a specific embodiment, the method comprises the specific steps of:

When in installation, the lower joint 303 is connected with the bearing 312, the load supporting disc 313 and the locking ring 314; the lower joint 303 is connected with a hydraulic cylinder 305, a contraction clamping spring 306, a bow piece 307, a shear pin 308, a stop block type back-off nut 309 and a piston 310; after connection, the nut is rotated counter clockwise relative to the housing as a unit to mount the stop back-off nut 309 in place. The torque-carrying sleeve 304, spring 302 and upper joint 301 continue to be installed.

In the process of entering the well, if the pipe column is blocked, the drilling tool 2 can be rotated clockwise to drive the releasing tool 3, the rotary tail pipe hanger 4, the casing string 5, the floating hoop 6 and the rotary guide shoe 7 to rotate, and meanwhile, the pump-on circulating drilling fluid can also promote the rotary guide shoe 7 to rotate so as to reduce friction in the process of entering the casing.

After the pipe column is put in place, the ball is thrown into the pipe to be pressed to the rotary tail pipe hanger 4 which is hung at the position of 10MPa, the ball is continuously pressed to 15MPa to cut off the shear pins 308, the piston 310 is lifted up, and the stop-type back-off nut 309 is retracted under the pressure of the bow piece 307 and is continuously lifted up along with the piston as shown in fig. 3. The stop back-off nut 309 is disengaged from the housing 315 to allow for a release, as shown in fig. 4.

If the pressure cannot be suppressed due to the special underground condition, the pipe column can be rotated anticlockwise, the stop-type back-off nut 309 and the housing 315 rotate relatively, and the threads are completely separated to realize the hand-off.

During well cementation, the drilling tool 2 can be driven to rotate by rotating the cement head 1 positively, torque is transmitted to the shell 315 through the lower street 303 and the torque sleeve 304, the sleeve string is driven to rotate, the centering of the pipe column is improved, meanwhile, the cement paste flow state is changed, and the well cementation quality is improved.

Example 1

A rotatable hydromechanical double-acting release process string comprising:

The releasing tool 3 is arranged between the drilling tool 2 and the rotary tail pipe hanger 4, and the whole tubular column sequentially comprises a rotary guide shoe 7, a float collar 6, a casing string 5, the rotary tail pipe hanger 4, the releasing tool 3, the drilling tool 2 and the rotary cementing head 1 from bottom to top.

And the casing pipe forms a basic unit of the pipe column.

The back-off nut 309 is arranged on the releasing tool 3, the back-off nut 309 is configured to support the up-down connection of the releasing tool 3, and the back-off nut can also be contracted in a hydraulic mode to fail the up-down connection of the releasing tool 3, so that releasing is completed; the stop-type back-off nut 309 also includes back-off rotation on the outside to effect release.

The release tool 3 includes:

The lower connector 303 is provided with a hydraulic cylinder 305, a piston 310 is arranged in the hydraulic cylinder 305, four grooves are formed in the piston 310, the outer side of the stop block type back-off nut 309 is a back-off thread (the back-off thread is preferably a coarse tooth right-hand thread and is matched with a coarse tooth left-hand thread in the shell 315), four groups of stop blocks are arranged on the inner side of the lower connector, and the shape and the size of the stop blocks are matched with those of the grooves in the piston 310.

The hydraulic cylinder 305 is provided with an arch piece 307, one end of the arch piece 307 is fixedly connected with the hydraulic cylinder 305, and the other end of the arch piece 307 abuts against one side of the stop block type back-off nut 309.

The left end of the bow 307 is welded with the hydraulic cylinder 305, and the right end is pressed on the outer side of the stop-type back-off nut 309, so that the bow can freely stretch and retract.

The lower connector 303 is further provided with a torque sleeve, and the torque sleeve is located above the housing 315 and sleeved outside the hydraulic cylinder 305, so as to transmit torque and protect the hydraulic cylinder 305.

The unidirectional meshing teeth can be of a plurality of concave-convex structures, and one side of each concave-convex structure is a smooth inclined surface, so that the unidirectional meshing teeth can smoothly and relatively slide when rotating anticlockwise; the other side is right-angled or chamfered, so that the torque is transmitted clockwise.

The outer wall of the lower joint 303 is provided with a plane, and the plane is matched with the torque sleeve and the hydraulic cylinder 305.

The bottom of the lower joint 303 is provided with a load supporting disc 313, and the lower joint 303 transmits pressure to the housing 315 through the load supporting disc 313; a bearing 312 is arranged between the lower joint 303 and the load support plate 313, and the load support plate 313 is limited by a locking ring 314.

In this embodiment, 4 grooves are formed in the circumferential direction of the hydraulic cylinder 305, the grooves are sized to accommodate the stop-type back-off nuts 309, the left ends of the arches 307 are welded to the hydraulic cylinder, and the right ends are pressed against the outer sides of the stop-type back-off nuts 309 and can be extended and retracted freely.

The inner hole of the stop block type back-off nut 309 is provided with a special groove which is meshed after sliding with the piston 310, the outer circle of the stop block type back-off nut 309 is provided with a rough-tooth right-handed thread which is matched with the rough-tooth left-handed thread in the shell 315, the processed thread is cut into 4 parts along a circumferential line, and the 4 parts are arranged in 4 grooves of the hydraulic cylinder 305 according to the relative positions before cutting.

Example 2

It is to be understood that the disclosed embodiments are not limited to the specific structures, process steps, or materials disclosed herein, but are intended to extend to equivalents of these features as would be understood by one of ordinary skill in the relevant arts. It is also to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting.

In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front," "rear," "head," "tail," and the like are used as an orientation or positional relationship based on that shown in the drawings, merely to facilitate description of the invention and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "connected," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

Certain terminology is used throughout this document to refer to particular system components. As one skilled in the art will recognize, identical components may generally be referred to by different names, and thus this document is not intended to distinguish between components that differ only in name, but not function. Reference in the specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the application. Thus, the appearances of the phrase "one embodiment" or "an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment.

The embodiments of the invention have been presented for purposes of illustration and description, and are not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications as are suited to the particular use contemplated.

While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiment and all alterations and/or modifications that fall within the scope of the invention, and that are intended to be included within the scope of the invention.

Claims

1. A rotatable hydromechanical double-acting release process string, comprising:

a release tool (3), the release tool (3) being arranged between the drilling tool (2) and the rotary liner hanger (4);

the releasing tool (3) is configured to realize releasing in a pressurizing mode, and when the condition that pressurization is impossible is met, releasing can be realized in a mechanical rotation mode.

2. The rotatable hydromechanical double-acting release process string according to claim 1, wherein the string further comprises:

A guide shoe (7) and a float collar (6) for guiding the sleeve to be put in;

The casing string (5) is arranged at the upper end of the floating hoop (6) to form a main body of the pipe column;

The lower end of the rotary tail pipe hanger (4) is connected with a casing string (5), and the upper end of the rotary tail pipe hanger is connected with a drilling tool (2) through the releasing tool (3);

The drilling tool (2) is lifted after well cementation; and

The rotary cement head (1) is positioned at a wellhead, the upper part of the rotary cement head is connected with a top drive, the lower part of the rotary cement head is connected with a drilling tool (2), the drill rod rubber plug is internally installed, the drill rod rubber plug can be released in the well cementation process, and the rotary cement head can be driven to rotate through the top drive.

3. A rotatable hydromechanical double-acting release process string according to claim 2, wherein the release tool (3) is provided with a stop-type back-off nut (309), the stop-type back-off nut (309) being configured to support an up-and-down connection of the release tool (3);

The stop block type back-off nut (309) is contracted in a hydraulic mode to realize releasing, releasing can be realized through back-off rotation on the outer side of the stop block type back-off nut, the stop block type back-off nut integrates limit bearing and back-off releasing functions, and the risk of releasing in advance of a traditional hydraulic releasing tool is avoided.

4. A rotatable hydromechanical double-acting release process string according to claim 3, wherein the release tool (3) comprises:

an upper joint (301), the upper joint (301) for connecting an upstream component;

A lower joint (303) which is connected with the upper joint (301) through threads;

a housing (315) disposed at a lower end of the lower joint (303), the housing (315) connecting downstream components;

wherein the lower connector (303) is connected with the shell (315) through the stop block type back-off nut (309).

5. The rotatable hydromechanical double-acting release process string according to claim 4, wherein a hydraulic cylinder (305) is arranged on the lower joint (303), a piston (310) is arranged in the hydraulic cylinder (305), and a plurality of grooves are arranged on the outer side of the piston (310);

the outer side of the stop block type back-off nut (309) is provided with a back-off thread connected with the shell (315), and the inner side of the stop block type back-off nut is provided with a stop block matched with the groove;

Initially, the piston (310) is in a first position, and the groove is staggered from the stop block, so that the piston (310) supports the stop block type back-off nut (309) in a propped state, and the stop block type back-off nut (309) is connected with the shell (315) through back-off threads;

Under the action of hydraulic pressure, the piston (310) moves to a second position, and the stop block enters the groove, so that the stop block type back-off nut (309) is separated from the shell (315), and releasing is completed.

6. A rotatable hydromechanical double-acting release process string according to claim 5, wherein the lower sub (303) is provided with a pressure transfer hole (311) communicating with the hydraulic cylinder (305), the piston (310) being initially connected between a first position and the hydraulic cylinder (305) by a shear pin (308);

by pressurizing within the string, pressure enters the hydraulic cylinder (305) through a pressure transfer orifice (311) and shears the shear pin (308), causing the piston (310) to move from a first position to a second position.

7. The rotatable hydromechanical double-acting release process string according to claim 6, wherein an arch piece (307) is arranged on the hydraulic cylinder (305), one end of the arch piece (307) is fixedly connected with the hydraulic cylinder (305), and the other end of the arch piece is abutted against one side of the stop block type back-off nut (309).

8. A rotatable hydromechanical double-acting release process string according to any of claims 4 to 7, wherein a torque sleeve is provided on the lower sub (303), the torque sleeve being connected to the housing (315) by means of a one-way engagement, enabling a single counter-clockwise relative rotation between the torque sleeve and the housing (315).

9. The rotatable hydromechanical double-acting release process string according to claim 8, wherein a spring (302) is arranged outside the upper part of the lower joint (303), one side of the spring (302) is connected to the torque sleeve, and the other side is connected to the upper joint (301).

10. A rotatable hydromechanical double-acting release process string according to claim 8, wherein a flat surface is provided on the outer wall of the lower sub (303), which flat surface cooperates with the torque sleeve and the hydraulic cylinder (305).

11. A rotatable hydromechanical double-acting release process string according to any of claims 4 to 10, wherein the bottom of the lower sub (303) is provided with a load-supporting disc (313), the lower sub (303) transmitting pressure to the housing (315) through the load-supporting disc (313);

a bearing (312) is arranged between the lower joint (303) and the load support disc (313), and the load support disc (313) is limited by a locking ring (314).

12. A rotary hydromechanical double-acting release method, characterized in that release is achieved by both mechanical rotation and hydraulics using a rotatable hydromechanical double-acting release process string according to any of claims 1 to 11.

13. The rotary hydromechanical double-acting releasing method according to claim 12, comprising:

In the process of pipe column running, the drilling tool (2) is rotated clockwise to drive the whole pipe column to rotate so as to reduce friction in the process of casing running;