CN107288563B

CN107288563B - Releasing tool

Info

Publication number: CN107288563B
Application number: CN201610202766.7A
Authority: CN
Inventors: 杨新克; 舒博钊; 南荣丽; 董小卫; 赵文龙; 牛罡
Original assignee: Petrochina Co Ltd
Current assignee: Petrochina Co Ltd
Priority date: 2016-03-31
Filing date: 2016-03-31
Publication date: 2023-04-25
Anticipated expiration: 2036-03-31
Also published as: CN107288563A

Abstract

The invention provides a releasing tool for keeping a sealing cylinder at a preset position, which comprises the following steps: the mandrel assembly, a part of the mandrel assembly stretches into the sealed cylinder; the connecting piece is at least partially clamped between the outer peripheral surface of the mandrel assembly and the inner peripheral surface of the sealing cylinder so that the connecting piece rotates along with the rotation of the mandrel assembly, and the connecting piece is in threaded connection with the sealing cylinder; the limiting part is positioned between the outer peripheral surface of the mandrel assembly and the inner peripheral surface of the sealing cylinder and is provided with a first working position and a second working position, and when the limiting part is positioned at the first working position, the limiting part is abutted with the connecting piece so that the connecting piece and the sealing cylinder are in a threaded locking state; when the limiting part is in the second working position, the limiting part is separated from the connecting piece so that the connecting piece and the sealing cylinder are in a thread loosening state. The invention solves the problem of poor reliability of releasing operation completed by releasing tools in the prior art.

Description

Releasing tool

Technical Field

The invention relates to the field of oilfield completion equipment, in particular to a releasing tool.

Background

There are two general types of existing releasing tools, one is a hydraulic releasing tool, and the other is a mechanical releasing tool.

The hydraulic releasing tool adopts a mode of 'shear pins' + 'pressing' to carry out releasing operation. On the one hand, in the process of entering the well, the shear pins are easy to be subjected to external impact load to generate fatigue deformation or be cut off accidentally, so that release pressure is inaccurate or release is performed in advance; on the other hand, the shear pins are easy to fatigue due to the relative motion stress among parts under the action of the 'buckling' generated by the rotary pipe column, so that releasing pressure is inaccurate or releasing is performed in advance.

Part of the mechanical releasing tool adopts a reverse buckling mode to release, and the other part adopts a direct pressing mode to release. The reverse buckling mode can not rotate the pipe column forward during the running, so that the running difficulty of the pipe column is greatly increased, and the running time of the pipe column is prolonged; the 'direct pressing down' mode is easy to collide with the 'meeting resistance' after the pipe column is put into the horizontal section, so that the underground condition is difficult to judge on the ground, the operation difficulty is high, the release is easy to cause, and the use of the tool in the horizontal well is limited.

Disclosure of Invention

The invention mainly aims to provide a releasing tool to solve the problem that the reliability of releasing operation finished by the releasing tool in the prior art is poor.

In order to achieve the above object, the present invention provides a releasing tool for leaving a seal cartridge in a predetermined position, comprising: the mandrel assembly, a part of the mandrel assembly stretches into the sealed cylinder; the connecting piece is at least partially clamped between the outer peripheral surface of the mandrel assembly and the inner peripheral surface of the sealing cylinder so that the connecting piece rotates along with the rotation of the mandrel assembly, and the connecting piece is in threaded connection with the sealing cylinder; the limiting part is positioned between the outer peripheral surface of the mandrel assembly and the inner peripheral surface of the sealing cylinder and is provided with a first working position and a second working position, and when the limiting part is positioned at the first working position, the limiting part is abutted with the connecting piece so that the connecting piece and the sealing cylinder are in a threaded locking state; when the limiting part is in the second working position, the limiting part is separated from the connecting piece so that the connecting piece and the sealing cylinder are in a thread loosening state.

Further, the connecting piece is the tube-shape, is provided with first circumference transmission structure on the inner peripheral face of the connecting piece of tube-shape, is provided with the second circumference transmission structure with first circumference transmission structure matched with on the outer peripheral face of dabber subassembly.

Further, the first circumferential transmission structure is at least one protrusion extending from the inner circumferential surface of the connecting piece to one side of the mandrel assembly, and the second circumferential transmission structure is a groove in clamping fit with the protrusion.

Further, the plurality of protrusions are provided, and the plurality of protrusions are arranged at intervals around the inner circumferential surface of the connecting piece.

Further, the outer circumferential surface of the connecting piece is provided with an external thread, and the external thread is provided with at least one deformation notch which is formed along the axial direction of the connecting piece.

Further, when the releasing tool is in a use state, the limiting part is positioned below the connecting piece, and when the limiting part is in a first working position, the upper end of the limiting part is abutted with the lower end of the connecting piece; when the limiting part is at the second working position, the upper end of the limiting part is separated from the lower end of the connecting piece.

Further, the first circumferential transmission structure is arranged on one side, far away from the limiting part, of the connecting piece, and the external thread is arranged on one side, close to the limiting part, of the connecting piece.

Further, a movement space is formed between the mandrel assembly and the connecting piece, and the movement space is used for enabling the position of the connecting piece relative to the sealing cylinder to change in the process that the limiting part changes from the first working position to the second working position.

Further, a first stop structure extending towards the movement space is arranged in the circumferential direction of the mandrel assembly, the first stop structure is located below the connecting piece and is in abutting connection or separation with the connecting piece in the axial direction of the mandrel assembly, when the limiting part is located at the first working position, the first stop structure is separated from the connecting piece and forms a movement gap, and the movement gap is a part of the movement space.

Further, the stopper includes: a support assembly abutting or separating from the connector; the first shear pin, the supporting component is arranged on the mandrel component through the first shear pin, when the first shear pin is in an uncut state, the limiting part is in a first working position to enable the connecting piece and the sealing cylinder to be in a threaded locking state, when the first shear pin is in a cut state, the limiting part is in a second working position, and the limiting part is separated from the connecting piece to enable the connecting piece and the sealing cylinder to be in a threaded loosening state.

Further, the support assembly includes: the support sleeve is sleeved on the outer side of the mandrel assembly and is in butt joint or separation with the connecting piece; the first movable piece of the support sleeve is supported along the axial direction of the mandrel assembly, the first movable piece is arranged on the mandrel assembly through a first shear pin, when the limiting part is positioned at a first working position, a pressure-bearing cavity is formed between one side, facing the mandrel assembly, of the first movable piece and the support sleeve and the outer peripheral surface of the mandrel assembly, a first pressure-transmitting through hole is formed in the side wall of the mandrel assembly, and the inner wall of the mandrel assembly is communicated with the pressure-bearing cavity through the first pressure-transmitting through hole.

Further, the first movable piece is provided with a second stop structure extending towards one side of the mandrel assembly, the second stop structure divides the pressure-bearing cavity into a first subcavity and a second subcavity along the axial direction of the mandrel assembly, the first subcavity is opposite to one side, close to the connecting piece, of the second subcavity, and the first pressure transmission through hole is communicated with the second subcavity; the first movable piece is provided with a second pressure transmission through hole communicated with the first subcavity, the side wall of the sealing cylinder is provided with a third pressure transmission through hole, and the second pressure transmission through hole is communicated with the third pressure transmission through hole.

Further, the support assembly further comprises: a seal disposed between the second stop structure and an outer peripheral surface of the mandrel assembly; and/or a safety ring disposed between the support sleeve and the outer peripheral surface of the mandrel assembly.

Further, the releasing tool further includes: the torque transmission part is sleeved on the mandrel assembly and can slide along the axial direction of the mandrel assembly, and the torque transmission part is provided with a downward torque transmission position and a releasing torque transmission position; the torque transmission part is connected with the mandrel component through the second shear pin; when the second shear pin is in an uncut state, the torque transmission part is in a downward torque transmission position so as to enable the torque transmission part to be in locking connection with the sealing cylinder and transmit the torque of the mandrel assembly to the sealing cylinder; when the second shear pin is in a sheared state, the torque transmitting portion is in a releasing torque transmitting position to separate the torque transmitting portion from the seal cartridge and transmit torque of the mandrel assembly to the connector.

Further, the releasing tool further comprises a stop ring, the stop ring is sleeved on the mandrel assembly to limit movement of the torque transmission part, and the torque transmission part is located between the stop ring and the sealing cylinder in the axial direction of the mandrel assembly.

Further, an end face of the torque transmission part facing one end of the sealing cylinder is provided with a first torque transmission structure, and the sealing cylinder is provided with a second torque transmission structure matched with the first torque transmission structure.

Further, the first moment transmission structure and the second moment transmission structure are concave-convex matching structures which are mutually clamped.

Further, the torque transmission part is provided with at least one sliding long hole penetrating through the side wall of the torque transmission part, and the length direction of the sliding long hole is the axial direction of the mandrel assembly.

Further, the spindle assembly has at least one torque transmitting block, one torque transmitting block being embedded in each of the slip slots.

Further, the torque transmission part comprises an adjusting sleeve and a second movable piece which are sequentially connected along the axial direction of the mandrel assembly, and the adjusting sleeve is in threaded connection with the second movable piece.

Further, the torque transmission part comprises an adjusting sleeve and a second movable piece which are sequentially connected along the axial direction of the mandrel assembly, and the adjusting sleeve is in threaded connection with the second movable piece; the second movable piece is provided with a first moment transmission structure.

Further, the torque transmission part comprises an adjusting sleeve and a second movable piece which are sequentially connected along the axial direction of the mandrel assembly, and the adjusting sleeve is in threaded connection with the second movable piece; the second movable piece is provided with a sliding long hole.

Further, the direction of rotation of the threads between the adjustment sleeve and the second movable member is opposite to the direction of rotation of the threads between the connecting member and the seal cartridge.

Further, the outer peripheral surface of the connecting piece is provided with external thread, and the external thread is left-handed external thread.

Further, the mandrel assembly comprises an upper joint, an upper mandrel and a lower mandrel which are sequentially connected along the axial direction of the mandrel assembly, the upper joint is in threaded connection with the upper mandrel, and the upper mandrel is in threaded connection with the lower mandrel.

Further, the thread rotation direction between the upper joint and the upper mandrel is opposite to the thread rotation direction of the connecting piece and the sealing cylinder; the rotation direction of the threads between the upper core shaft and the lower core shaft is opposite to the rotation direction of the threads of the connecting piece and the sealing cylinder.

By applying the technical scheme of the invention, because the connecting piece is in threaded connection with the sealing cylinder, torque can be transmitted to the connecting piece through the mandrel assembly, and thus the separation of the connecting piece and the sealing cylinder can be realized in a mechanical rotation mode, and the sealing cylinder is left at a preset position, so that the releasing operation of the releasing tool is completed. Because the spacing portion has first working position, when spacing portion is in first working position, spacing portion and connecting piece butt so that connecting piece and seal cylinder be in screw thread locking state, seal cylinder and release tool form an integrated structure like this, and release tool alright reach the preset position with seal cylinder. Because the limiting part is provided with the second working position, the limiting part is separated from the connecting piece so that the connecting piece and the sealing cylinder are in a thread loosening state, and therefore, under the condition that the thread structures of the connecting piece and the sealing cylinder are not damaged, the connecting piece and the sealing cylinder are separated, and the connecting piece and the sealing cylinder can be separated from each other by pulling the mandrel assembly connected with the connecting piece so as to leave the sealing cylinder at a preset position. Therefore, the releasing tool can complete releasing operation in two modes, and when one releasing mode fails, the releasing tool can still complete releasing action in the other releasing mode. Therefore, the use reliability of the releasing tool is improved, the reliability of the releasing tool for completing releasing operation is ensured, and the service life of the releasing tool is effectively prolonged. Meanwhile, the releasing tool has the characteristics of simple structure and safe operation.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:

FIG. 1 shows a schematic structural view of a release tool with a seal cartridge according to an alternative embodiment of the present invention; and

fig. 2 shows a partial enlarged view at a in fig. 1.

Wherein the above figures include the following reference numerals:

10. a sealing cylinder; 101. a third pressure-transmitting through hole; 102. a second torque transmission structure; 112. a pressure-bearing cavity; 1121. a first subchamber; 1122. a second subchamber; 20. a mandrel assembly; 21. an upper joint; 211. a fourth pressure transmission through hole; 212. a torque transfer block; 22. an upper mandrel; 221. a first stop structure; 222. a first pressure-transmitting through hole; 23. a lower core shaft; 30. a connecting piece; 31. a first circumferential transmission structure; 32. an external thread; 33. a movement space; 331. a movement gap; 40. a limit part; 41. a support assembly; 411. a support sleeve; 412. a first movable member; 4121. a second stop structure; 4122. a second pressure-transmitting through hole; 413. a seal; 414. a safety ring; 42. a first shear pin; 50. a torque transmission part; 51. an adjusting sleeve; 52. a second movable member; 521. a first torque transmission structure; 522. a sliding long hole; 53. a clasp; 60. a second shear pin; 70. a stop ring.

Detailed Description

It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.

It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

In the present invention, unless otherwise indicated, terms of orientation such as "upper" and "lower" are used generally with respect to the orientation shown in the drawings or to the vertical, vertical or gravitational orientation; also, for ease of understanding and description, "left, right" is generally directed to the left, right as shown in the drawings; "inner and outer" refer to inner and outer relative to the outline of the components themselves, but the above-described orientation terms are not intended to limit the present invention.

The invention provides a releasing tool, which aims to solve the problems that the releasing tool in the prior art is poor in reliability of releasing operation, complex in structure and difficult to operate.

As shown in fig. 1 and 2, the releasing tool for leaving the sealing cylinder 10 in a predetermined position of the present invention includes a mandrel assembly 20, a connector 30, and a stopper 40, a portion of the mandrel assembly 20 extending into the sealing cylinder 10; at least a portion of the connection member 30 is interposed between the outer circumferential surface of the spindle assembly 20 and the inner circumferential surface of the seal cartridge 10 such that the connection member 30 rotates with the rotation of the spindle assembly 20, the connection member 30 and the seal cartridge 10 being screw-coupled; the limiting part 40 is positioned between the outer peripheral surface of the mandrel assembly 20 and the inner peripheral surface of the sealing cylinder 10, the limiting part 40 is provided with a first working position and a second working position, and when the limiting part 40 is positioned at the first working position, the limiting part 40 is abutted with the connecting piece 30 so as to enable the connecting piece 30 and the sealing cylinder 10 to be in a threaded locking state; when the limiting portion 40 is in the second working position, the limiting portion 40 is separated from the connecting member 30 to enable the connecting member 30 and the sealing cylinder 10 to be in a thread release state.

Due to the threaded connection between the connector 30 and the seal cartridge 10, torque can be transmitted to the connector 30 through the mandrel assembly 20, and thus separation of the connector 30 and the seal cartridge 10 can be achieved through mechanical rotation, so that the seal cartridge 10 is left at a predetermined position, and releasing operation of the releasing tool is completed.

Because the limiting part 40 has the first working position, when the limiting part 40 is in the first working position, the limiting part 40 is abutted with the connecting piece 30 so as to enable the connecting piece 30 and the sealing barrel 10 to be in a threaded locking state, and therefore the sealing barrel 10 and the releasing tool form an integrated structure, and the releasing tool can send the sealing barrel 10 to a preset position.

Since the limiting portion 40 has the second working position, the limiting portion 40 is separated from the connecting member 30 to enable the connecting member 30 and the sealing cylinder 10 to be in a screw thread loose state, so that the connecting member 30 and the sealing cylinder 10 are separated under the condition that the screw thread structures of the connecting member 30 and the sealing cylinder 10 are not damaged, and the connecting member 30 and the sealing cylinder 10 can be separated by pulling the mandrel assembly 20 connected with the connecting member 30 to enable the sealing cylinder 10 to be left at a preset position. Therefore, the releasing tool can complete releasing operation in two modes, and when one releasing mode fails, the releasing tool can still complete releasing action in the other releasing mode. Therefore, the use reliability of the releasing tool is improved, the reliability of the releasing tool for completing releasing operation is ensured, and the service life of the releasing tool is effectively prolonged. Meanwhile, the releasing tool has the characteristics of simple structure and safe operation.

In an alternative embodiment of the present invention, as shown in fig. 1, the connecting member 30 is cylindrical, a first circumferential transmission structure 31 is provided on an inner circumferential surface of the connecting member 30, and a second circumferential transmission structure matched with the first circumferential transmission structure 31 is provided on an outer circumferential surface of the mandrel assembly 20. Like this, first circumference transmission structure 31 and second circumference transmission structure chucking cooperation so that first circumference transmission structure 31 and second circumference transmission structure can the circumference synchronous rotation to guaranteed that dabber subassembly 20 steadily transmits the moment of torsion that it received to connecting piece 30, make connecting piece 30 can rotate along with dabber subassembly 20's rotation, and then guaranteed the reliability of releasing tool work.

Optionally, the first circumferential transmission structure 31 is at least one protrusion extending from the inner peripheral surface of the connecting member 30 toward the mandrel assembly 20, and the second circumferential transmission structure is a groove in which the protrusion is engaged. With this alternative embodiment, not only is stability of torque transfer between the spindle assembly 20 and the connector 30 ensured, but assembly and disassembly of the spindle assembly 20 and the connector 30 is simplified, thereby improving the convenience of the release tool.

Further alternatively, the plurality of projections are provided in plural, the plurality of projections being disposed at intervals around the inner peripheral surface of the connecting member 30. In this alternative embodiment, the torque is transmitted to the connecting piece 30 by the mandrel assembly 20, so that the contact area between the mandrel assembly 20 and the connecting piece 30 can be effectively increased, and therefore, the torsion force between the first circumferential transmission structure 31 and the second circumferential transmission structure is uniformly distributed, the damage to parts of the releasing tool caused by overlarge local stress is avoided, and the service life of the releasing tool is further prolonged.

As shown in fig. 1, when the releasing tool is in a use state, the limiting part 40 is positioned below the connecting piece 30, and when the limiting part 40 is in the first working position, the upper end of the limiting part 40 is abutted with the lower end of the connecting piece 30; when the limiting portion 40 is at the second working position, the upper end of the limiting portion 40 is separated from the lower end of the connecting piece 30. In this way, after the restraint between the limiting portion 40 and the spindle assembly 20 is removed, the limiting portion 40 can be switched from the first operating position to the second operating position by the action of gravity, so that the abutment force between the limiting portion 40 and the connector 30 is removed.

As shown in fig. 1 and 2, the outer circumferential surface of the connector 30 has an external thread 32, and the external thread 32 has at least one deformation notch (not shown) opened in the axial direction of the connector 30. In this way, when the upper end of the limiting portion 40 is separated from the lower end of the connecting member 30, the connecting member 30 is radially deformed by the deformation notch, so that the restraining capability between the thread section of the sealing cylinder 10 and the fixing portion of the connecting member 30 having the deformation notch is reduced. In this way, when the connecting piece 30 receives an external force along the axial direction of the mandrel assembly 20, the connecting piece can be separated from the sealing cylinder 10 smoothly, so that the releasing tool and the sealing cylinder 10 can be separated smoothly, and the reliability of releasing operation of the releasing tool is ensured.

Optionally, the first circumferential transmission structure 31 is disposed on a side of the connecting member 30 away from the limiting portion 40, and the external thread 32 is disposed on a side of the connecting member 30 near the limiting portion 40. In this way, it is ensured that the connection 30 has the furthest distance between the position of the incoming torque and the position of the outgoing torque of the connection 30 during the torque transmission, thereby increasing the moment arm and ensuring a stable torque transmission.

As shown in fig. 1 and 2, a movement space 33 is provided between the spindle assembly 20 and the connecting member 30, and the movement space 33 is used for changing the position of the connecting member 30 relative to the sealing cylinder 10 during the process of changing the limit portion 40 from the first working position to the second working position. Since the movement space 33 is provided between the mandrel assembly 20 and the connecting member 30, the movement space 33 provides a margin for the connecting member 30 to move in the axial direction and/or the radial direction of the mandrel assembly 20, so that when the upper end of the limiting portion 40 is separated from the lower end of the connecting member 30, the connecting member 30 can move relative to the stationary sealing cylinder 10, thereby gradually releasing the connecting member 30 and the sealing cylinder 10, and ensuring the stability of the separation of the connecting member 30 and the sealing cylinder 10.

As shown in fig. 1 and 2, the spindle assembly 20 is circumferentially provided with a first stop structure 221 protruding toward the movement space 33, the first stop structure 221 being located below the connection member 30 and abutting or separating from the connection member 30 in the axial direction of the spindle assembly 20, the first stop structure 221 being separated from the connection member 30 and forming a movement gap 331 when the limiting portion 40 is in the first working position, the movement gap 331 being a part of the movement space 33.

Because the first stopping structure 221 is provided, when the upper end of the limiting part 40 is separated from the lower end of the connecting piece 30, the connecting piece 30 moves downwards due to the gravity action of the connecting piece 30, and the first stopping structure 221 and the second movable piece 52 cooperate to effectively limit the first circumferential transmission structure 31 of the connecting piece 30 in the movement gap 331, so that the connecting piece 30 is also retracted simultaneously when the releasing tool is recovered.

In an alternative embodiment, not shown, the plurality of connectors are spaced circumferentially about the mandrel assembly, each connector being threadably coupled to the seal cartridge in the first operating position. And each connecting piece synchronously rotates relative to the mandrel assembly under the action of the first circumferential transmission structure. When the connecting piece is at the first working position, the limiting part supports the connecting piece below the connecting piece. Because the connecting piece and the limiting part are in an inclined plane matching state, the limiting part provides a supporting force in the radial direction along the mandrel assembly so that the connecting piece is tightly matched with the sealing cylinder. When the limiting part is separated from the connecting piece, the radial supporting force borne by the connecting piece disappears, and at the moment, the restraining force of the connecting piece and the sealing cylinder in the radial direction can be reduced, so that the connecting piece can be separated along with the mandrel assembly and the sealing cylinder when the connecting piece is pulled upwards away from the mandrel assembly.

As shown in fig. 1 and 2, the limiting portion 40 includes a support assembly 41 and a first shear pin 42 that are abutted or separated from the connecting member 30; the support assembly 41 is disposed on the mandrel assembly 20 through the first shear pin 42, and when the first shear pin 42 is in an uncut state, the limiting portion 40 is in a first working position to enable the connecting piece 30 and the sealing cylinder 10 to be in a threaded locking state, and when the first shear pin 42 is in a cut state, the limiting portion 40 is in a second working position, and the limiting portion 40 is separated from the connecting piece 30 to enable the connecting piece 30 and the sealing cylinder 10 to be in a threaded loosening state.

During the process of lowering the release tool and sealing cartridge 10, the first shear pins 42 are not acted upon by external forces, so that the support assembly 41 remains in abutment with the connector 30, while the first shear pins 42 are in an uncut state. At this time, the first shear pin 42 fixes the support assembly 41 and the mandrel assembly 20 together so that the connecting piece 30 is always acted by the abutting force of the support assembly 41, thereby ensuring that the connecting piece 30 and the sealing cylinder 10 are always in a threaded locking state, and ensuring the connection reliability between the connecting piece 30 and the sealing cylinder 10. Moreover, after the sealing cylinder 10 reaches the preset position, the supporting component 41 moves downwards after the first shear pin 42 is cut off, so that the connecting piece 30 is not supported by the supporting component 41, and at this time, the releasing tool can be separated from the sealing cylinder 10 by lifting the mandrel component 20, and the releasing tool can be recovered.

As shown in fig. 1, the support assembly 41 includes a support sleeve 411 sleeved outside the mandrel assembly 20 and a first movable member 412 for supporting the support sleeve 411 along the axial direction of the mandrel assembly 20, wherein the support sleeve 411 is abutted or separated from the connecting member 30; the first movable member 412 is disposed on the mandrel assembly 20 through the first shear pin 42, when the limiting portion 40 is in the first working position, a pressure-bearing cavity 112 is formed between a side of the first movable member 412 and the supporting sleeve 411, which faces the mandrel assembly 20, and an outer circumferential surface of the mandrel assembly 20, the sidewall of the mandrel assembly 20 has a first pressure-transmitting through hole 222, and an inner wall of the mandrel assembly 20 is communicated with the pressure-bearing cavity 112 through the first pressure-transmitting through hole 222. In this way, fluid may enter the pressure chamber 112 through the first pressure transfer port 222 to shear the first shear pin 42.

As shown in fig. 1, the first movable member 412 has a second stop structure 4121 protruding toward one side of the mandrel assembly 20, the second stop structure 4121 divides the pressure-bearing cavity 112 into a first subchamber 1121 and a second subchamber 1122 along the axial direction of the mandrel assembly 20, the first subchamber 1121 is located at one side of the second subchamber 1122, which is close to the connecting member 30, and the first pressure-transmitting through hole 222 is communicated with the second subchamber 1122; the first movable member 412 has a second pressure transmission through hole 4122 communicating with the first subchamber 1121, and the side wall of the seal cylinder 10 has a third pressure transmission through hole 101, and the second pressure transmission through hole 4122 communicates with the third pressure transmission through hole 101. In this way, stable ingress of liquid into either the first subchamber 1121 or the second subchamber 1122 is ensured such that the first movable member 412 is forced downward to shear the first shear pin 42.

As shown in fig. 1 and 2, the support assembly 41 further includes a seal 413 and a safety ring 414, the seal 413 being disposed between the second stopper structure 4121 and the outer circumferential surface of the spindle assembly 20; and/or a safety ring 414 is provided between the support sleeve 411 and the outer circumferential surface of the spindle assembly 20. Since the seal 413 is provided between the second stopper 4121 and the outer peripheral surface of the spindle assembly 20, the sealability between the first pressure transmitting through hole 222 and the second sub-chamber 1122 is ensured. Since the safety ring 414 is disposed between the support sleeve 411 and the outer circumferential surface of the spindle assembly 20, when the limiting portion 40 is in the first working position, the safety ring 414 has a limiting effect on the support sleeve 411, and when the limiting portion 40 is in the second working position, the safety ring 414 can be separated from the spindle assembly 20 in a direction away from the spindle assembly 20 to lose the limiting effect on the support sleeve 411 so as to move the support sleeve 411 downward.

As shown in fig. 1, the releasing tool further comprises a moment transmitting part 50 and a second shear pin 60, wherein the moment transmitting part 50 is sleeved on the mandrel assembly 20 and can slide along the axial direction of the mandrel assembly 20, and the moment transmitting part 50 has a lower moment transmitting position and a releasing moment transmitting position; the torque transmitting portion 50 is connected to the spindle assembly 20 by a second shear pin 60; when the second shear pin 60 is in the uncut condition, the torque transmitting portion 50 is in the lowered torque transmitting position to lockingly connect the torque transmitting portion 50 with the seal cartridge 10 and transfer torque of the mandrel assembly 20 to the seal cartridge 10; when the second shear pin 60 is in the sheared condition, the torque transmitting portion 50 is in the release torque transmitting position to disengage the torque transmitting portion 50 from the seal cartridge 10 and transmit torque of the mandrel assembly 20 to the connector 30.

The second shear pins 60 are arranged, so that when the second shear pins 60 are in front and back of a shearing state, the moment transmitting part 50 is ensured to move from the lower moment transmitting position to the releasing moment transmitting position. Specifically, during the process of lowering the release tool and the seal cartridge 10, the torque transmitting part 50 is in the lowered torque transmitting position (as shown in fig. 1), at this time, the mandrel assembly 20 transmits the torque received by itself to the torque transmitting part 50 through the torque transmitting part 50, and the torque received by the torque transmitting part 50 is transmitted to the seal cartridge 10, so that the seal cartridge 10 rotates along with the rotation of the release tool, and when the integral tubular string with the release tool and the seal cartridge 10 is lowered into the open hole horizontal section to encounter an obstruction, the integral tubular string can pass through the obstruction to continue to descend by rotating the release tool. When the sealing cylinder 10 reaches the preset position, the second shear pin 60 is cut off, the torque transmitting part 50 moves upwards integrally, the torque transmitting part 50 reaches the releasing torque transmitting position (not shown), at this time, the mandrel assembly 20 is not transmitted to the sealing cylinder 10 after being subjected to torque, but is directly transmitted to the connecting piece 30, and therefore, even when the limiting part 40 is in the first working position, the releasing tool and the sealing cylinder 10 can be separated by rotating the releasing tool, so that the sealing cylinder 10 is left at the preset position, and the releasing tool is recovered.

The moment transmitting portion 50 moves upward as a whole in the following manner: as shown in fig. 1, a fourth pressure transmission through hole 211 is formed in the torque transmission part 50, a sealing cavity is defined between the torque transmission part 50 and the mandrel assembly 20, and an O-ring for sealing the sealing cavity is respectively arranged on the inner peripheral side of the torque transmission part 50 and the outer peripheral side of the mandrel assembly 20; the fourth pressure-transmitting through hole 211 is communicated with the sealed cavity, so that liquid can enter the sealed cavity through the fourth pressure-transmitting through hole 211, and the sealed cavity bears pressure to enable the second shear pin 60 to be sheared under the action of shearing force, so that the moment-transmitting part 50 moves upwards under the action of the liquid pushing force, and the movement process of the moment-transmitting part 50 from the lowered moment-transmitting position to the releasing moment-transmitting position is completed.

As shown in fig. 1, the release tool further includes a stop ring 70, the stop ring 70 being sleeved on the mandrel assembly 20 to limit movement of the torque transmitting portion 50, the torque transmitting portion 50 being located between the stop ring 70 and the seal cartridge 10 in an axial direction along the mandrel assembly 20. In this way, the moment transmitting part 50 is prevented from being excessively moved upward to collide with other structural members other than the releasing tool.

As shown in fig. 1, the end surface of the torque transmitting portion 50 facing the end of the seal cylinder 10 has a first torque transmitting structure 521, and the seal cylinder 10 has a second torque transmitting structure 102 that is mated with the first torque transmitting structure 521. The first moment transmitting structure 521 and the second moment transmitting structure 102 are concave-convex mating structures that are engaged with each other. In this way, when the torque transmitting portion 50 is in the lowered torque transmitting position, stable torque transmission of the spindle assembly 20 to the seal cartridge 10 is ensured.

As shown in fig. 1, the torque transmitting portion 50 has at least one long sliding hole 522 provided through a side wall of the torque transmitting portion 50, and a longitudinal direction of the long sliding hole 522 is an axial direction of the spindle assembly 20. The spindle assembly 20 has at least one torque transfer block 212, one torque transfer block 212 being embedded in each slip slot 522. Thus, when the torque transmitting portion 50 moves from the lowered torque transmitting position to the released torque transmitting position, the torque transmitting block 212 moves in the longitudinal direction of the slide long hole 522, and the slide long hole 522 also functions to restrict the upward movement displacement of the spindle assembly 20. When the spindle assembly 20 rotates, the torque transfer block 212 is clamped on the inner side wall of the sliding long hole 522, so that the torque of the spindle assembly 20 is always effectively transferred to the torque transfer part 50.

As shown in fig. 1, the torque transmitting part 50 includes an adjustment sleeve 51 and a second movable member 52 connected in sequence in the axial direction of the spindle assembly 20, the adjustment sleeve 51 and the second movable member 52 being screwed. The torque transmission part 50 comprises an adjusting sleeve 51 and a second movable piece 52 which are sequentially connected along the axial direction of the mandrel assembly 20, and the adjusting sleeve 51 is in threaded connection with the second movable piece 52; the second movable member 52 has a first moment-transmitting structure 521. The torque transmission part 50 comprises an adjusting sleeve 51 and a second movable piece 52 which are sequentially connected along the axial direction of the mandrel assembly 20, and the adjusting sleeve 51 is in threaded connection with the second movable piece 52; the second movable member 52 has a slide long hole 522. The direction of rotation of the threads between the adjustment sleeve 51 and the second movable member 52 is opposite to the direction of rotation of the threads between the connecting member 30 and the seal cartridge 10. In this way, when the connector 30 is separated from the seal cartridge 10 by rotating the connector 30, the phenomenon that the release tool fails due to the release of the adjusting sleeve 51 and the second movable member 52 by rotation is avoided, thereby improving the stability of the operation of the release tool.

As shown in fig. 1, the torque transmission part 50 further includes a snap ring 53 disposed between the adjusting sleeve 51 and the outer peripheral surface of the mandrel assembly 20, when the torque transmission part 50 moves upward under the action of the liquid thrust, the snap ring 53 also moves upward along with the torque transmission part 50, and the snap ring 53 has unidirectional movement characteristics, so that the mandrel assembly 20 can be held tightly in the upward movement process, thereby avoiding the effect of the working effect of the releasing tool caused by the torque transmission error due to the decrease of the gravity of the torque transmission part 50, and further ensuring the reliability of the working of the releasing tool.

Optionally, the snap ring 53 is a C-shaped snap ring.

As shown in fig. 1, the mandrel assembly 20 includes an upper joint 21, an upper mandrel 22 and a lower mandrel 23, which are sequentially connected in the axial direction of the mandrel assembly 20, the upper joint 21 and the upper mandrel 22 are screwed, and the upper mandrel 22 and the lower mandrel 23 are screwed. The direction of rotation of the threads between the upper joint 21 and the upper spindle 22 is opposite to the direction of rotation of the threads of the connecting piece 30 and the sealing cylinder 10; the direction of rotation of the threads between the upper spindle 22 and the lower spindle 23 is opposite to the direction of rotation of the threads of the connector 30 and the seal cartridge 10. In this way, when the connector 30 is separated from the seal cartridge 10 by rotating the connector 30, the phenomenon that the upper joint 21 and the upper core shaft 22 are in threaded connection and the upper core shaft 22 and the lower core shaft 23 are released by rotation to cause the failure of the releasing tool is avoided, so that the working stability of the releasing tool is improved.

Optionally, the outer peripheral surface of the connecting member 30 has an external thread 32, and the external thread 32 is a left-handed external thread. At this time, the adjusting sleeve 51 is screwed with the second movable member 52, the upper joint 21 is screwed with the upper core shaft 22, and the threads between the upper core shaft 22 and the lower core shaft 23 are all right-handed threads.

Two modes of releasing the releasing tool of the present invention are specifically described below:

mode one: when the integral pipe string with the releasing tool and the sealing barrel 10 is lowered to the preset position of the sealing barrel 10 and the hydraulic suspension packer setting is completed, the space (not shown) between the upper part of the suspension packer, the outside of the pipe string and the casing pipe is driven into the liquid with pressure, the liquid enters the first subchamber 1121 through the third pressure transmission through hole 101 and the second pressure transmission through hole 4122, so that the pressure acts on the first movable part 412, the first movable part 412 is subjected to downward force, when the liquid pressure reaches the set value, the force acting on the first movable part 412 shears the first shearing shear pin 42, so that the first movable part 412 moves downward, the safety ring 414 loses the limiting function, the supporting sleeve 411 moves downward, so that the lower part of the connecting part 30 loses the support of the supporting sleeve 411, and when the mandrel assembly 20 is lifted up, the part of the connecting part 30 with the external thread 32 is contracted, so that the connecting part 30 is separated from the sealing barrel 10, and the releasing operation of the releasing tool is realized after the mandrel assembly 20 is lifted up.

Mode two: when the hydraulic suspension packer is set and pressed, liquid enters the sealing cavity from the fourth pressure transmission through hole 211, the torque transmission part 50 is subjected to upward force, when the liquid pressure in the sealing cavity reaches a set value, the force acting on the torque transmission part 50 shears the second shear pin 60, so that the torque transmission part 50 moves upward, the first torque transmission structure 521 of the torque transmission part 50 is separated from the second torque transmission structure 102 at the upper end of the sealing cylinder 10, meanwhile, the clamping ring 53 contracts, the torque transmission part 50 is prevented from falling back, then the mandrel assembly 20 enables the releasing tool and the sealing cylinder 10 to bear tensile load, the mandrel assembly 20 is rotated again, the threads of the connecting piece 30 are separated from the threads of the sealing cylinder 10, and finally, the releasing tool directly realizes releasing operation.

The releasing tool can also realize the setting of the suspended packer, and the specific process is as follows: when an accident occurs in the whole pipe column lowering process with the releasing tool and the sealing cylinder 10 and the hanging packer cannot be set according to a normal program, a ball can be thrown into a central pipe (not shown) of the releasing tool, falls into the conical surface of a setting ball seat, is pressed in the pipe column, and liquid enters the hydraulic hanging packer through a pressure transmission water hole in the middle of the lower mandrel 23, so that the hanging packer is set; and then realizing the releasing operation of the well tool by the releasing mode and recovering the releasing tool.

The releasing tool of the invention has the following advantages:

1. before and after the releasing operation is carried out by using the releasing tool provided by the invention, the screw thread at the upper end of the sealing cylinder 10 is intact and exposed, so that the pipe column can be connected back down again for subsequent construction.

2. The releasing tool is simple in structure, safe and reliable to use and capable of solving various problems in construction.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

It should be noted that the terms "first," "second," and the like in the description and claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the present application described herein may be implemented in sequences other than those illustrated or described herein.

The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A release tool for leaving a sealed cartridge (10) in a predetermined position, comprising:

-a spindle assembly (20), a portion of the spindle assembly (20) extending into the seal cartridge (10);

a connecting member (30), at least a portion of the connecting member (30) being interposed between an outer peripheral surface of the spindle assembly (20) and an inner peripheral surface of the seal cylinder (10) so that the connecting member (30) rotates with rotation of the spindle assembly (20), the connecting member (30) and the seal cylinder (10) being threadedly connected;

a limiting part (40), wherein the limiting part (40) is positioned between the outer peripheral surface of the mandrel assembly (20) and the inner peripheral surface of the sealing cylinder (10), the limiting part (40) is provided with a first working position and a second working position, and when the limiting part (40) is positioned at the first working position, the limiting part (40) is abutted with the connecting piece (30) so as to enable the connecting piece (30) and the sealing cylinder (10) to be in a threaded locking state; when the limiting part (40) is in the second working position, the limiting part (40) is separated from the connecting piece (30) so as to enable the connecting piece (30) and the sealing cylinder (10) to be in a thread loosening state;

The torque transmission part (50) is sleeved on the mandrel assembly (20) and can slide along the axial direction of the mandrel assembly (20), the torque transmission part (50) is provided with a downward torque transmission position and a releasing torque transmission position, the end face of the torque transmission part (50) facing one end of the sealing cylinder (10) is provided with a first torque transmission structure (521), the sealing cylinder (10) is provided with a second torque transmission structure (102) matched with the first torque transmission structure (521), the first torque transmission structure (521) and the second torque transmission structure (102) are concave-convex matched structures which are mutually clamped, the torque transmission part (50) is further provided with at least one sliding long hole (522) which penetrates through the side wall of the torque transmission part (50), the length direction of the sliding long hole (522) is the axial direction of the mandrel assembly (20), and the mandrel assembly (20) is provided with at least one torque transmission block (212); a fourth pressure transmission through hole (211) is further formed in the torque transmission part (50), a sealing cavity is formed between the torque transmission part (50) and the mandrel assembly (20), and the fourth pressure transmission through hole (211) is communicated with the sealing cavity;

A second shear pin (60), the torque transmitting portion (50) being connected to the mandrel assembly (20) by the second shear pin (60);

when the second shear pin (60) is in an uncut state, the torque transmitting part (50) is in the lowered torque transmitting position so as to enable the torque transmitting part (50) to be in locking connection with the sealing cylinder (10) and transmit the torque of the mandrel assembly (20) to the sealing cylinder (10); when the second shear pin (60) is in a sheared condition, the torque transmitting portion (50) is in the release torque transmitting position to disengage the torque transmitting portion (50) from the seal cartridge (10) and transmit torque of the mandrel assembly (20) to the connector (30).

2. A release tool according to claim 1, wherein the connecting piece (30) is cylindrical, a first circumferential transmission structure (31) is arranged on the inner circumferential surface of the connecting piece (30) which is cylindrical, and a second circumferential transmission structure matched with the first circumferential transmission structure (31) is arranged on the outer circumferential surface of the mandrel assembly (20).

3. A release tool according to claim 2, wherein the first circumferential transmission structure (31) is at least one protrusion extending from the inner circumference of the connecting piece (30) towards the side of the spindle assembly (20), and the second circumferential transmission structure is a groove in snap fit with the protrusion.

4. A release tool according to claim 3, wherein the protrusions are plural, and the plural protrusions are arranged at intervals around the inner peripheral surface of the connection member (30).

5. A release tool according to claim 2, characterized in that the outer circumferential surface of the connection piece (30) has an external thread (32), the external thread (32) having at least one deformation cut open in the axial direction of the connection piece (30).

6. A release tool according to claim 5, wherein the limit part (40) is located below the connection piece (30) when the release tool is in use, and wherein the upper end of the limit part (40) abuts against the lower end of the connection piece (30) when the limit part (40) is in the first working position; when the limiting part (40) is in the second working position, the upper end of the limiting part (40) is separated from the lower end of the connecting piece (30).

7. A release tool according to claim 6, wherein the first circumferential transmission structure (31) is arranged on a side of the connection piece (30) remote from the limit part (40), and the external thread (32) is arranged on a side of the connection piece (30) close to the limit part (40).

8. A release tool according to claim 6, characterized in that there is a movement space (33) between the spindle assembly (20) and the connecting piece (30), the movement space (33) being used to change the position of the connecting piece (30) relative to the sealing cylinder (10) during the change of the limit stop (40) from the first working position to the second working position.

9. A release tool according to claim 8, characterized in that the spindle assembly (20) is provided with a first stop structure (221) protruding towards the movement space (33) in the circumferential direction, the first stop structure (221) being located below the connection piece (30) and abutting or separating from the connection piece (30) in the axial direction of the spindle assembly (20), the first stop structure (221) separating from the connection piece (30) and forming a movement gap (331), the movement gap (331) being part of the movement space (33) when the limit stop (40) is in the first working position.

10. A release tool according to claim 1, wherein the limit stop (40) comprises:

A support assembly (41) abutting or separated from the connection member (30);

the first shear pin (42), the supporting component (41) is arranged on the mandrel component (20) through the first shear pin (42), when the first shear pin (42) is in an uncut state, the limiting part (40) is in the first working position so that the connecting piece (30) and the sealing cylinder (10) are in a threaded locking state, when the first shear pin (42) is in a cut state, the limiting part (40) is in the second working position, and the limiting part (40) is separated from the connecting piece (30) so that the connecting piece (30) and the sealing cylinder (10) are in a threaded loosening state.

11. A release tool according to claim 10, wherein the support assembly (41) comprises:

the support sleeve (411) is sleeved on the outer side of the mandrel assembly (20), and the support sleeve (411) is abutted or separated from the connecting piece (30);

the first movable piece (412) of the support sleeve (411) is supported along the axial direction of the mandrel assembly (20), the first movable piece (412) is arranged on the mandrel assembly (20) through the first shear pin (42), when the limiting part (40) is positioned at the first working position, a pressure-bearing cavity (112) is formed between one side, facing the mandrel assembly (20), of the first movable piece (412) and the outer peripheral surface of the mandrel assembly (20), of the support sleeve (411), a first pressure-transmitting through hole (222) is formed in the side wall of the mandrel assembly (20), and the inner wall of the mandrel assembly (20) is communicated with the pressure-bearing cavity (112) through the first pressure-transmitting through hole (222).

12. The release tool according to claim 11, wherein the first movable member (412) has a second stopper structure (4121) protruding toward one side of the mandrel assembly (20), the second stopper structure (4121) dividing the pressure-receiving chamber (112) into a first subchamber (1121) and a second subchamber (1122) along the axial direction of the mandrel assembly (20), the first subchamber (1121) being adjacent to one side of the connecting member (30) with respect to the second subchamber (1122), the first pressure-transmitting through hole (222) being in communication with the second subchamber (1122); the first movable piece (412) is provided with a second pressure transmission through hole (4122) communicated with the first subchamber (1121), the side wall of the sealing cylinder (10) is provided with a third pressure transmission through hole (101), and the second pressure transmission through hole (4122) is communicated with the third pressure transmission through hole (101).

13. A release tool according to claim 12, wherein the support assembly (41) further comprises:

a seal (413), the seal (413) being disposed between the second stop structure (4121) and an outer circumferential surface of the spindle assembly (20); and/or

A safety ring (414), the safety ring (414) being arranged between the support sleeve (411) and the outer circumferential surface of the spindle assembly (20).

14. A release tool according to claim 1, further comprising a stop ring (70), the stop ring (70) being arranged over the spindle assembly (20) to limit the movement of the torque transmitting part (50), the torque transmitting part (50) being located between the stop ring (70) and the seal cartridge (10) in an axial direction of the spindle assembly (20).

15. A release tool according to claim 1, wherein the torque transmitting part (50) comprises an adjusting sleeve (51) and a second movable member (52) connected in sequence in the axial direction of the spindle assembly (20), the adjusting sleeve (51) and the second movable member (52) being screwed.

16. A release tool according to claim 1, wherein the torque transmitting part (50) comprises an adjusting sleeve (51) and a second movable member (52) connected in sequence in the axial direction of the mandrel assembly (20), the adjusting sleeve (51) and the second movable member (52) being screwed; the second movable member (52) has the first moment transmission structure (521).

17. A release tool according to claim 1, wherein the torque transmitting part (50) comprises an adjusting sleeve (51) and a second movable member (52) connected in sequence in the axial direction of the mandrel assembly (20), the adjusting sleeve (51) and the second movable member (52) being screwed; the second movable member (52) has the slide long hole (522).

18. A release tool according to claim 15, wherein the direction of rotation of the screw thread between the adjustment sleeve (51) and the second movable member (52) is opposite to the direction of rotation of the screw thread between the connection member (30) and the sealing cylinder (10).

19. A release tool according to claim 18, wherein the outer circumferential surface of the connection piece (30) has an external thread (32), the external thread (32) being a left-hand external thread.

20. A release tool according to claim 1, wherein the mandrel assembly (20) comprises an upper joint (21), an upper mandrel (22) and a lower mandrel (23) connected in sequence along the mandrel assembly (20) axial direction, the upper joint (21) and the upper mandrel (22) being screwed, the upper mandrel (22) and the lower mandrel (23) being screwed.

21. A release tool according to claim 20, wherein the direction of thread rotation between the upper joint (21) and the upper mandrel (22) is opposite to the direction of thread rotation of the connection piece (30) and the sealing cylinder (10); the direction of rotation of the threads between the upper spindle (22) and the lower spindle (23) is opposite to the direction of rotation of the threads of the connecting piece (30) and the sealing cylinder (10).