CN219888016U

CN219888016U - Releasing device

Info

Publication number: CN219888016U
Application number: CN202320366156.6U
Authority: CN
Inventors: 刘练; 陈丽帆; 李靖; 宋金艳; 王超; 李洪文
Original assignee: China Petroleum and Chemical Corp; Sinopec Northwest Oil Field Co
Current assignee: China Petroleum and Chemical Corp; Sinopec Northwest Oil Field Co
Priority date: 2023-03-02
Filing date: 2023-03-02
Publication date: 2023-10-24
Anticipated expiration: 2033-03-02

Abstract

The utility model provides a releasing device, which comprises a first connector, a releasing mechanism arranged at the downstream of the first connector and a piston sleeve arranged at the radial inner side, wherein the piston sleeve is fixedly connected with the releasing claw through a pin, and a second connector arranged at the downstream of the piston sleeve, the pin is configured to be sheared under the action of external pressure so as to enable the piston sleeve to move downstream until the piston sleeve axially abuts against the second connector, and the piston sleeve is configured to be capable of continuing to move downstream under the action of further external pressure so as to enable the second connector to drop from the releasing device. According to the utility model, the second joint can be pushed out from the releasing device through the axial movement of the piston sleeve and the limiting ring, so that releasing operation is completed.

Description

Releasing device

Technical Field

The utility model relates to the field of oil and gas field drilling and well completion, in particular to a releasing device.

Background

Currently, for a well for plugging an open hole water layer or a well for hole repairing and layer changing, no corresponding open hole bridge plug exists, so that a process of 'a releasing device, an open hole packer and a plug' is generally adopted when the well is faced.

Common release devices include hydraulic release devices and mechanical and hydraulic integrated release devices. The hydraulic release device can release the ball by pressing after throwing the ball, but the pipe column in the well cannot pump the ball usually in the horizontal well section, so that releasing operation cannot be smoothly performed. The mechanical and hydraulic integrated releasing device usually needs to raise a certain tonnage to realize releasing, but the open hole packer in the well generally does not have anchoring capability, so that the open hole packer is extremely easy to fail.

Accordingly, it is desirable in the art to provide a release device to address the above-described problems.

Disclosure of Invention

The utility model aims to provide a releasing device which can push out a second joint from the releasing device through axial movement of a piston sleeve and a limiting ring so as to finish releasing operation.

According to the utility model, there is provided a release device comprising a first joint,

a releasing mechanism arranged at the downstream of the first joint and comprising a release claw at the radial outer side and a piston sleeve at the radial inner side, wherein the piston sleeve is axially abutted with the first joint in the initial state and fixedly connected with the release claw through a pin, and

a second joint provided downstream of the piston housing, an inner peripheral surface of the second joint being sealingly connected with an outer peripheral surface of the release pawl,

wherein the pin is configured to shear under external pressure causing the piston sleeve to move downstream until axially abutting the second joint, and the piston sleeve is configured to continue to move downstream under further external pressure causing the second joint to drop from the release device.

In one embodiment, the release pawl includes a first release pawl portion configured in the form of a hollow sleeve and a second release pawl portion extending radially inward from the first release pawl portion, wherein the piston sleeve is fixedly connected to the first release pawl portion by a pin.

In one embodiment, a first step extending radially inward and for limiting the axial movement stroke of the piston sleeve is formed at the junction of the second release pawl portion and the first release pawl portion.

In one embodiment, the releasing mechanism further includes a ratchet provided on an outer wall of the second release pawl portion in a circumferential direction, the ratchet being engaged with an inner peripheral surface of the second joint in an initial state so as to allow only downstream movement of the second joint.

In one embodiment, the release device further comprises a stop collar disposed at the downstream end of the piston sleeve, the stop collar configured to axially abut the second fitting through a radially inwardly and downwardly sloped second step.

In one embodiment, the release device further comprises a rotation stop ring sleeved outside the second release pawl portion and upstream of the second joint.

In one embodiment, a polygonal cut surface for restricting rotation of the release pawl is milled at an inner peripheral surface of the rotation stop ring.

In one embodiment, the anti-rotation ring comprises a first connecting portion in the form of a hollow sleeve, and a plurality of circumferentially spaced apart second connecting portions extending axially downwardly from the first connecting portion,

the second connector is provided with a plurality of clamping grooves which can be respectively engaged with the second connecting parts.

In one embodiment, the release claw is fixedly connected with the first joint, the release claw is fixedly connected with the anti-rotation ring, and the piston sleeve is fixedly connected with the limiting ring through fastening screws.

In one embodiment, a seal is provided between the piston sleeve and the release pawl and between the second release pawl and the second joint, the seal comprising at least one of a seal ring or a back ring.

Compared with the prior art, the utility model has the advantages that: according to the utility model, the second joint can be pushed out from the releasing device through the axial movement of the piston sleeve and the limiting ring, so that releasing operation is completed. The utility model can judge the releasing condition through the position of the piston sleeve (or the pressure balance of the oil sleeve), and the device has no requirement on the tonnage of the lower pipe column. The device has simple structure, strong applicability and high success rate of releasing.

Drawings

The utility model will be described in detail below with reference to the attached drawing figures, wherein:

fig. 1 schematically shows the structure of a releasing device according to the present utility model.

In the drawings, like parts are designated with like reference numerals. The figures are not drawn to scale.

Detailed Description

In order to make the technical solution and advantages of the present utility model more apparent, exemplary embodiments of the present utility model 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 utility model and are not exhaustive of all embodiments. And embodiments of the utility model and features of the embodiments may be combined with each other without conflict.

The utility model will be further described with reference to the accompanying drawings.

As shown in fig. 1, a releasing device 100 according to the present utility model includes a first joint 1, a releasing mechanism 2, and a second joint 3 arranged in this order from top to bottom. The release mechanism 2 includes a release pawl 21 and a piston sleeve 22. Wherein the piston sleeve 22 is radially inside. The piston sleeve 22 is axially abutted against the first joint 1 in the initial state, and the piston sleeve 22 is movable downstream by the external pressure, so that the second joint 3 is pushed out from the releasing device to achieve pressure balance. The contents of which are described below. The release pawl 21 is radially outward to ensure that the piston sleeve 22 can perform the releasing work smoothly. In a preferred embodiment, the external pressure is an oil jacket differential pressure.

In a specific embodiment, as shown in fig. 1, the piston sleeve 22 is fixedly connected to the release pawl 21 by a pin 23. The pin 23 is configured to shear under external pressure causing the sleeve 22 to move downstream until it axially abuts the second fitting 3, and the sleeve 22 is configured to continue to move downstream under further external pressure causing the second fitting 3 to drop from the release device. The device adopts a staged mode to carry out releasing work, so that the real-time position of the piston sleeve 22 can be known more accurately in the releasing process, and the operation success rate of the releasing device 100 and the beneficial effects brought by releasing operation can be effectively improved.

In one specific embodiment, the inner peripheral surface of the second joint 3 is sealingly connected with the outer peripheral surface of the release pawl 21. Therefore, the second connector 3 can be kept in a stable state under the action of the release claw 21 in the process of lowering, so that the success rate of releasing work is improved.

In one embodiment, as shown in fig. 1, the release pawl 21 includes a first release pawl portion 211 configured in the form of a hollow sleeve and a second release pawl portion 212 extending radially inward from the first release pawl portion 211. Wherein the piston sleeve 22 is fixedly connected to the first release pawl portion 211 by the pin 23 such that the piston sleeve 22 is axially movable within the first release pawl portion 211 when the pin 23 is sheared. The second connector 3 is sleeved outside the second release pawl portion 212 and is capable of forming a sealed connection with the second release pawl portion 212, the specific construction of which is described below.

In one embodiment, as shown in FIG. 1, release mechanism 2 further includes ratchet teeth 214 circumferentially disposed on the outer wall of second release pawl portion 212. Accordingly, a tooth structure adapted to the ratchet teeth 214 is also provided on the inner peripheral surface of the second joint 3, and therefore, the second joint 3 can be brought into a stable connection relationship with the second release pawl portion 212 in the initial state.

In one particular embodiment, the ratchet teeth 214 on the second release pawl portion 212 are configured to allow only downstream movement of the second fitting 3, thereby ensuring that the second fitting 3 can be successfully dropped from the release device 100, thereby effectively improving the success rate of operation of the release device 100.

According to the utility model, the releasing device further comprises a stop collar 4, as shown in fig. 1. The retainer ring 4 is provided at the downstream end of the piston sleeve 22, and the retainer ring 4 is brought into stable connection with the piston sleeve 22 by a plurality of fastening screws 6 provided in the circumferential direction.

Preferably, a second step 41 is formed at the downstream end of the stop collar 4, which is disposed radially inward and obliquely downward. The stop collar 4 is configured to move downstream under the influence of the piston sleeve 22 and to be able to axially abut the second fitting 3 via the second step 41, thereby assisting the piston sleeve 22 in pushing the second fitting 3 out of the release device.

It will be readily appreciated that correspondingly, a third step 31 is formed on the inner wall of the second joint 3, which fits the second step 41. Therefore, when the retainer ring 4 moves downstream with the piston sleeve 22, the second step 41 can effectively and sufficiently abut against the third step 31 on the second joint 3, so that the second joint 3 can be smoothly pushed away by further external pressure.

The second connector 3 can be pushed out of the releasing device 100 through the piston sleeve 22 and the limiting ring 4, so that releasing operation is completed. Compared with the prior art, the utility model has no requirement on tonnage of the lower pipe string (the pipe string is fixedly connected with the downstream end of the second joint 3), and the releasing condition can be judged through the position of the piston sleeve 22 (or the pressure balance of the oil sleeve).

In one embodiment, a first step 213 extending radially inward is formed at the junction of the second release pawl portion 212 and the first release pawl portion 211. Preferably, the first step 213 of the second release pawl portion 212 is capable of axially abutting the piston sleeve 22, thereby limiting the axial movement travel of the piston sleeve 22, and further ensuring that the releasing device 100 is capable of successfully completing releasing work.

According to the utility model, the release device 100 further comprises a rotation stop ring 5. The anti-rotation ring 5 is not only sleeved outside the second release pawl portion 212, but also upstream of the second joint 3. Preferably, the rotation stopping ring 5 is brought into stable connection with the second release pawl portion 212 by a plurality of fastening screws 6 provided in the circumferential direction, and the rotation stopping ring 5 can axially abut against the second joint 3 in the initial state. In this way, the stop collar 5 can more fully abut the second sub 3 during the lowering of the release device 100, thereby acting in cooperation with the ratchet teeth 214 on the second release pawl portion 212 to prevent upstream movement of the second sub 3.

In one embodiment, a polygonal cut surface is milled at the inner peripheral surface of the anti-rotation ring 5. Preferably, the polygonal tangential plane is a hexagonal tangential plane. Accordingly, a hexagonal tangential surface is also milled on the outer peripheral surface of the second release pawl portion 212. Therefore, the inner peripheral surface of the suspension swivel 5 can be tightly fitted with the outer peripheral surface of the second release pawl portion 212 during the releasing operation, so that the release pawl 21 can be prevented from rotating.

In a specific embodiment, the anti-rotation ring 5 and the second release pawl portion 212 can also achieve the effect of transmitting torque under the action of the polygonal tangential surface, thereby ensuring that the releasing device 100 can smoothly complete releasing work.

According to the present utility model, as shown in fig. 1, the anti-rotation ring 5 includes a first connection portion 51 in the form of a hollow sleeve, and a plurality of second connection portions 52 extending axially downward from the first connection portion 51 and arranged at intervals in the circumferential direction. Accordingly, the second connector 3 has a plurality of catching grooves (not shown in the drawings) capable of respectively forming engagement with the respective second connection portions 52. Thereby, the rotation stop ring 5 can be engaged with the spline of the catching groove by the second connecting portion 52 for the purpose of preventing the rotation of the second joint 3.

In a specific embodiment, the anti-rotation ring 5 and the second connector 3 can also achieve the effect of transmitting torque under the effect of the second connection portion 52 and the clamping groove, so as to ensure that the releasing device 100 can smoothly complete releasing work.

In one embodiment, the release pawl 21 is fixedly connected to the first joint 1 by a tightening screw 6. Therefore, the stable connection relationship between the release pawl 21 and the first joint 1 can be maintained at all times during the lowering and releasing process.

In a specific embodiment, seals are provided between the piston sleeve 22 and the release pawl 21, between the second release pawl portion 212 and the second joint 3, and between the first release pawl portion 211 and the first joint 1. The seal includes at least one of a seal ring or a back ring. Preferably, the seal ring is an O-ring seal.

The utility model provides a releasing device, which can push out a second joint 3 from the releasing device 100 through the axial movement of a piston sleeve 22 and a limiting ring 4 so as to complete releasing operation. The utility model can judge the releasing condition through the position of the piston sleeve 22 (or the pressure balance of the oil sleeve), and the device has no requirement on the tonnage of the lower pipe column. The device has simple structure, strong applicability and high success rate of releasing.

The above is only a preferred embodiment of the present utility model, but the scope of the present utility model is not limited thereto. Modifications and variations may readily be made by those skilled in the art within the scope of the present disclosure, and such modifications and variations are intended to be included within the scope of the present utility model. Therefore, the protection scope of the utility model is subject to the protection scope of the claims.

Claims

1. A release device, comprising:

a first joint (1),

a release mechanism (2) arranged downstream of the first joint (1) and comprising a release claw (21) arranged on the radial outer side and a piston sleeve (22) arranged on the radial inner side, wherein the piston sleeve (22) is axially abutted with the first joint (1) in the initial state and is fixedly connected with the release claw (21) through a pin (23), and

a second joint (3) provided downstream of the piston sleeve (22), an inner peripheral surface of the second joint (3) being sealingly connected with an outer peripheral surface of the release pawl (21),

wherein the pin (23) is configured to shear under external pressure to cause the piston sleeve (22) to move downstream until axially abutting the second fitting (3), and the piston sleeve (22) is configured to continue to move downstream under further external pressure to cause the second fitting (3) to drop from the release device.

2. A release device according to claim 1, wherein the release pawl (21) comprises a first release pawl portion (211) configured in the form of a hollow sleeve, and a second release pawl portion (212) extending radially inwards from the first release pawl portion (211), wherein the piston sleeve (22) is fixedly connected to the first release pawl portion (211) by means of a pin (23).

3. A release device according to claim 2, characterized in that a first step (213) extending radially inwards and limiting the axial movement stroke of the piston sleeve (22) is formed at the junction of the second release pawl portion (212) and the first release pawl portion (211).

4. A release device according to claim 3, wherein the release mechanism (2) further comprises ratchet teeth (214) provided circumferentially on an outer wall of the second release pawl portion (212), the ratchet teeth (214) being engaged with an inner peripheral surface of the second joint (3) in an initial state, thereby allowing only downstream movement of the second joint (3).

5. A release device according to claim 4, further comprising a stop collar (4) arranged at the downstream end of the piston sleeve (22), the stop collar (4) being configured to be axially abuttable with the second joint (3) by a radially inwardly and downwardly inclined second step (41).

6. A release device according to claim 5, further comprising a rotation stop ring (5) sleeved outside the second release claw portion (212) and upstream of the second joint (3).

7. A release device according to claim 6, characterized in that a polygonal tangential surface for limiting the rotation of the release pawl (21) is milled at the inner peripheral surface of the rotation stop ring (5).

8. A release device according to claim 7, wherein the anti-rotation ring (5) comprises a first connection portion (51) in the form of a hollow sleeve, and a number of circumferentially spaced apart second connection portions (52) extending axially downwards from the first connection portion (51),

the second connector (3) is provided with a plurality of clamping grooves which can be respectively engaged with the second connecting parts (52).

9. A release device according to claim 8, characterized in that the release pawl (21) is fixedly connected to the first joint (1), the release pawl (21) to the rotation stop ring (5) and the piston sleeve (22) to the stop ring (4) by means of fastening screws (6).

10. A release device according to claim 9, wherein a seal is provided between the piston sleeve (22) and the release pawl (21) and between the second release pawl portion (212) and the second joint (3), the seal comprising at least one of a sealing ring or a backing ring.