CN211397517U - Releasing device for well completion of oil and gas well - Google Patents
Releasing device for well completion of oil and gas well Download PDFInfo
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- CN211397517U CN211397517U CN201922171079.5U CN201922171079U CN211397517U CN 211397517 U CN211397517 U CN 211397517U CN 201922171079 U CN201922171079 U CN 201922171079U CN 211397517 U CN211397517 U CN 211397517U
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Abstract
The utility model discloses an oil gas well completion releasing device, which comprises a pawl connecting sleeve, a supporting sleeve and a piston sleeve which are sequentially sleeved from outside to inside; the pawl connecting sleeve consists of a sleeve and 4-6 pawls arranged at the bottom end of the sleeve; a second annular limiting step is arranged on the inner wall of the lower part of the pawl connecting sleeve, and a third annular limiting step is arranged on the lower part of the supporting sleeve, so that the supporting sleeve is arranged on the lower part of the pawl connecting sleeve and is fixed in the pawl connecting sleeve through a plurality of shearing pins; a fourth annular limiting step is arranged on the outer wall of the upper part of the piston sleeve, so that the bottom end of the supporting sleeve is pressed on the fourth annular limiting step, and the piston sleeve is matched with the pawl connecting sleeve through a one-way horse-tooth thread, so that the piston sleeve can only move upwards relative to the pawl connecting sleeve along the axial direction; the releasing device for the oil and gas well completion is simple in structure, convenient to install, convenient to operate, capable of effectively avoiding tripping in advance and separating, easy to control construction process, large in bearing range of a well completion pipe column due to the pawl connecting sleeve, smooth in radial deformation and high in construction success rate.
Description
Technical Field
The utility model relates to a well completion instrument technical field, in particular to oil gas well completion releasing device.
Background
After a period of production, the well shaft of the oil-gas well has poor state due to various factors such as geological conditions, oil conditions and the like, so that normal production is influenced, and the production requirement cannot be met. Therefore, well completion operations for well workover purposes are required to perform maintenance on the oil and gas wells in order to maintain high recovery.
The conventional releasing device used in a construction site has the problems that the releasing cannot be accurately started, so that the construction process is difficult to judge, and the releasing is easy to release and unreliable in the use process due to the adoption of a thread back-off structure; there is a need for a release device that is simple to operate and that accurately releases the lower completion string to remain downhole and then be lifted out of the wellbore along with the running string.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an overcome the oil gas well completion release device of the problem that the release device exists that above-mentioned job site was used always.
Therefore, the utility model discloses technical scheme as follows:
a releasing device for well completion of an oil and gas well comprises a pawl connecting sleeve, a supporting sleeve and a piston sleeve which are sequentially sleeved from outside to inside; wherein the content of the first and second substances,
the pawl connecting sleeve is composed of a sleeve and 4-6 pawls which are formed by extending downwards from the end face of the bottom end of the sleeve along the axial direction and are uniformly distributed along the circumferential direction; a second annular limiting step is formed by the inner wall of the upper part of the sleeve sinking inwards, and a one-way horse-tooth internal thread is arranged on the inner wall of the sleeve below the second annular limiting step;
the supporting sleeve is of a cylinder structure, a third annular limiting step matched with the second annular limiting step is formed by inwards recessing the outer wall of the lower part of the supporting sleeve, the lower end face of the third annular limiting step of the supporting sleeve is pressed on the upper end face of the second annular limiting step of the pawl connecting sleeve, and the supporting sleeve is fixed on the inner side of the lower part of the pawl connecting sleeve through a plurality of shearing pins uniformly distributed along the circumferential direction of the pawl connecting sleeve;
the piston sleeve is of a cylinder structure, the outer wall of the upper part of the piston sleeve is recessed inwards to form a fourth annular limiting step matched with the bottom end of the supporting sleeve, and the bottom end of the supporting sleeve is pressed on the upper end surface of the fourth annular limiting step; and a unidirectional horse-tooth external thread is arranged on the outer wall of the piston sleeve below the fourth annular limiting step, and the unidirectional horse-tooth external thread of the piston sleeve is matched with the unidirectional horse-tooth internal thread of the pawl connecting sleeve, so that the piston sleeve can only move upwards along the axial direction relative to the pawl connecting sleeve.
Furthermore, the top end of the pawl connecting sleeve is in threaded connection with an upper joint, and a first annular limiting step for limiting the traveling distance between the supporting sleeve and the piston sleeve is arranged on the inner wall of the upper joint.
Further, the upper joint is in threaded connection with the top end of the pawl connecting sleeve, and a first sealing ring is arranged at the position close to the threaded connection part, so that the upper joint and the pawl connecting sleeve form threaded sealing connection.
Furthermore, a plurality of fastening screws are uniformly distributed on the outer wall of the lower part of the upper joint along the circumferential direction, so that the upper joint is fixedly and fixedly arranged on the pawl connecting sleeve.
Still further, the fastening screw is a socket head cap screw.
Furthermore, a second sealing ring is arranged on the outer wall of the supporting sleeve and positioned on two sides of the shearing pin respectively, so that sealing is formed between the supporting sleeve and the pawl connecting sleeve.
Furthermore, two third sealing rings are arranged on the outer wall of the piston sleeve above the fourth annular limiting step, so that sealing is formed between the support sleeve and the piston sleeve.
Further, the axial length of the piston sleeve is matched with the axial length of the pawl connecting sleeve, so that the bottom end face of the piston sleeve in an initial state is flush with or lower than the tail end face of the pawl, and when the piston sleeve moves upwards to the top end of the piston sleeve to abut against the lower end face of the first annular limiting step, the bottom end face of the piston sleeve is flush with or higher than the bottom end face of the sleeve of the pawl connecting sleeve.
Furthermore, a fifth annular limiting step is formed by inwards recessing the outer wall of the lower portion of the sleeve of the pawl connecting sleeve, and a fourth sealing ring is arranged on the outer wall of the sleeve below the fifth annular limiting step.
Compared with the prior art, the oil and gas well completion releasing device is simple in structure, convenient to install and operate, the non-threaded reversing structure design that the releasing and the well completion pipe string are separated is realized by utilizing the shear pin and the bottom hole hydraulic pressure to be matched, compared with the conventional threaded reversing structure, the problem that the reliability of a tool is low due to the fact that the releasing and separating are conducted in advance is effectively solved, the construction process is easy to judge, meanwhile, the bearing range of the well completion pipe string is large by adopting the pawl connecting sleeve, the application range is wide, radial deformation is smooth, and the construction success rate is high.
Drawings
FIG. 1 is a schematic structural diagram of the releasing device for oil and gas well completion of the present invention;
fig. 2 is a partially enlarged view of fig. 1.
Detailed Description
The present invention will be further described with reference to the following drawings and specific examples, but the following examples are by no means limiting the present invention.
As shown in fig. 1, the releasing device for oil and gas well completion comprises a pawl connecting sleeve 2, a supporting sleeve 4 and a piston sleeve 5 which are sequentially sleeved from outside to inside, and an upper joint 1 arranged at the top end of the pawl connecting sleeve 2; wherein the content of the first and second substances,
the upper joint 1 is fixedly connected with the pawl connecting sleeve 2 through threads, and a first sealing ring 6 is arranged on the outer wall of the top end of the pawl connecting sleeve 2 above the threaded connection part of the upper joint 1 and the pawl connecting sleeve 2, so that the upper joint 1 and the pawl connecting sleeve 2 are in threaded sealing connection; meanwhile, a plurality of fastening screws 7 are uniformly distributed on the outer wall of the lower part of the upper joint 1 along the circumferential direction, so that the upper joint 1 is fixedly reinforced on the pawl connecting sleeve 2, and the problem of tripping in the using process is avoided; specifically, the fastening screw 7 is a socket head cap screw;
a first annular limiting step for limiting the ascending distance between the support sleeve 4 and the piston sleeve 5 is arranged on the inner wall of the upper joint 1, namely when the support sleeve 4 and the piston sleeve 5 ascend to the top ends of the support sleeve 4 and the piston sleeve 5 and abut against the lower end surface of the first annular limiting step, the support sleeve 4 and the piston sleeve 5 do not ascend any more;
the pawl connecting sleeve 2 consists of a sleeve and six pawls which are formed by extending downwards from the end surface of the bottom end of the sleeve along the axial direction and are uniformly distributed along the circumferential direction, so that the pawl connecting sleeve meets the requirement of bearing the weight of various well completion pipe strings; wherein, the inner wall of the upper part of the sleeve is sunken inwards to form a second annular limiting step, and the inner wall of the sleeve below the second annular limiting step is provided with a one-way horse-tooth internal thread;
the supporting sleeve 4 is of a cylinder structure, a third annular limiting step matched with the second annular limiting step is formed by inwards recessing the outer wall of the lower part of the supporting sleeve 4, the lower end face of the third annular limiting step of the supporting sleeve 4 is pressed on the upper end face of the second annular limiting step of the pawl connecting sleeve 2, and the supporting sleeve 4 is fixed on the inner side of the lower part of the pawl connecting sleeve 2 through 4-6 shearing pins 3 uniformly distributed along the circumferential direction of the pawl connecting sleeve 2;
the size and the number of the shear pins are matched with the pre-designed shear pressure, so that the piston 5 moves upwards under the action of hydraulic pressure to push the support sleeve 4, and all the shear pins 3 are sheared under the action of the support sleeve 4; the structural design realizes the releasing function after the shearing pin 3 is sheared, and compared with the conventional thread back-off structure, the non-thread back-off structure can effectively avoid the unreliability of releasing due to the rotation of the thread; meanwhile, the structural design ensures that the hydraulic pressure for starting the releasing is clear in limited range, and the construction process is easy to judge;
the piston sleeve 5 is of a cylinder structure, the outer wall of the upper part of the piston sleeve is recessed inwards to form a fourth annular limiting step which is matched with the bottom end of the support sleeve 4, so that the bottom end of the support sleeve 4 is pressed on the upper end surface of the fourth annular limiting step; the outer wall of the piston sleeve positioned below the fourth annular limiting step is provided with a one-way horse-tooth external thread; as shown in fig. 2, the one-way horse-tooth external threads of the piston sleeve 5 are matched with the one-way horse-tooth internal threads of the pawl connecting sleeve 2, so that the piston sleeve 5 can only move upwards along the axial direction of the pawl connecting sleeve 2, six pawls are released, and a deformation space is provided for the pawl connecting sleeve 2 in the radial direction, so that the pawl connecting sleeve can contract inwards in the radial direction to be separated from a well completion pipe string;
in structural design, the axial length of the piston sleeve 5 is matched with the axial length of the pawl connecting sleeve 2, so that the bottom end face of the piston sleeve 5 in an initial state is flush with the tail end face of the pawl or lower than the pawl end of the pawl connecting sleeve 2, and when the piston sleeve 5 moves upwards to the top end of the piston sleeve to abut against the lower end face of the first annular limiting step, the bottom end face of the piston sleeve 5 is flush with the bottom end face of the sleeve of the pawl connecting sleeve 2 or higher than the bottom end face of the sleeve of the pawl connecting sleeve 2.
In order to ensure the whole sealing performance of the device, a second sealing ring 8 is respectively arranged on the outer wall of the supporting sleeve 4 and on two sides of the shearing pin 3, so that sealing is formed between the supporting sleeve 4 and the pawl connecting sleeve 2; two third sealing rings 9 are arranged on the outer wall of the piston sleeve 5 above the fourth annular limiting step, so that sealing is formed between the support sleeve 4 and the piston sleeve 5.
In addition, when the releasing device for oil and gas well completion is used, the lower part of the pawl connecting sleeve 2 is connected with a well completion pipe column, correspondingly, the outer wall of the lower part of the sleeve of the pawl connecting sleeve 2 is recessed inwards to form a fifth annular limiting step, a fourth sealing ring 10 is arranged on the outer wall of the sleeve below the fifth annular limiting step, the well completion pipe column is sleeved on the lower part of the pawl connecting sleeve 2, the top end of the well completion pipe column abuts against the lower end face of the fifth annular limiting step, the well completion pipe column is connected with the pawl connecting sleeve 2 under the action that the radially expanded pawls are pressed in a fixing groove in the inner side of the well completion pipe column, and meanwhile, the pawl connecting sleeve 2 and the well completion pipe column are sealed through the fourth sealing ring 10.
When the oil and gas well completion releasing device is used, an upper connector 1 at the upper end of the releasing device is connected with a feeding pipe column, and a pawl connecting sleeve 2 at the lower end is connected with a well completion pipe column which needs to be left at the bottom of a well. After the pipe columns are connected, the pipe columns are lowered to the underground designed position to carry out well completion operation; after completion operation is finished, under the action of hydraulic pressure, the piston 5 pushes the support sleeve 4, the shear pin 3 is sheared under the action of upward axial force, and axial constraint on the support sleeve 4 is relieved; the support sleeve 4 moves upwards to release the axial constraint on the piston 5. The piston 5 moves upwards to release the radial constraint on the pawl connecting sleeve 2, and radial movement space is provided for the pawl. The running string is lifted up, the pawl is deformed inwards, and the completion string is abandoned.
Claims (9)
1. A releasing device for well completion of an oil and gas well is characterized by comprising a pawl connecting sleeve (2), a supporting sleeve (4) and a piston sleeve (5) which are sequentially sleeved from outside to inside; wherein the content of the first and second substances,
the pawl connecting sleeve (2) is composed of a sleeve and 4-6 pawls which are formed by extending downwards from the end face of the bottom end of the sleeve along the axial direction and are uniformly distributed along the circumferential direction; a second annular limiting step is formed by the inner wall of the upper part of the sleeve sinking inwards, and a one-way horse-tooth internal thread is arranged on the inner wall of the sleeve below the second annular limiting step;
the supporting sleeve (4) is of a cylindrical structure, a third annular limiting step matched with the second annular limiting step is formed by inwards recessing the outer wall of the lower part of the supporting sleeve (4), the lower end face of the third annular limiting step of the supporting sleeve (4) is pressed on the upper end face of the second annular limiting step of the pawl connecting sleeve (2), and the supporting sleeve (4) is fixed on the inner side of the lower part of the pawl connecting sleeve (2) through a plurality of shearing pins (3) uniformly distributed along the circumferential direction of the pawl connecting sleeve (2);
the piston sleeve (5) is of a cylinder structure, the outer wall of the upper part of the piston sleeve is recessed inwards to form a fourth annular limiting step which is matched with the bottom end of the supporting sleeve (4), and the bottom end of the supporting sleeve (4) is pressed on the upper end face of the fourth annular limiting step; and a one-way horse-tooth external thread is arranged on the outer wall of the piston sleeve below the fourth annular limiting step, and the one-way horse-tooth external thread of the piston sleeve (5) is matched with the one-way horse-tooth internal thread of the pawl connecting sleeve (2) so that the piston sleeve (5) can only move upwards relative to the pawl connecting sleeve (2) along the axial direction.
2. The releasing device for oil and gas well completion according to claim 1, characterized in that the top end of the pawl coupling sleeve (2) is connected with an upper joint (1) in a threaded manner, and the inner wall of the upper joint (1) is provided with a first annular limiting step for limiting the ascending distance between the supporting sleeve (4) and the piston sleeve (5).
3. An oil and gas well completion releasing device as claimed in claim 2, characterized in that the upper joint (1) is screwed on the top end of the pawl coupling sleeve (2), and a first sealing ring (6) is arranged near the screwed connection, so that the upper joint and the pawl coupling sleeve form a screwed sealing connection.
4. An oil and gas well completion releasing device as claimed in claim 3, characterized in that a plurality of fastening screws (7) are uniformly arranged on the outer wall of the lower part of the upper joint (1) along the circumferential direction, so that the upper joint (1) is fixed on the pawl coupling sleeve (2) in a reinforcing way.
5. An oil and gas well completion releasing device as claimed in claim 4, characterized in that said fastening screw (7) is a socket head cap screw.
6. An oil and gas well completion releasing device as claimed in claim 1, characterized in that a second sealing ring (8) is arranged on the outer wall of the supporting sleeve (4) and on both sides of the shear pin (3) respectively, so that a seal is formed between the supporting sleeve (4) and the pawl coupling sleeve (2).
7. An oil and gas well completion releasing device as claimed in claim 1, wherein two third sealing rings (9) are arranged on the outer wall of the piston sleeve (5) above the fourth annular limiting step, so that sealing is formed between the support sleeve (4) and the piston sleeve (5).
8. The oil and gas well completion releasing device as claimed in claim 2, wherein the axial length of the piston sleeve (5) is matched with the axial length of the pawl coupling sleeve (2), so that the bottom end face of the piston sleeve (5) in an initial state is flush with the tail end face of the pawl or lower than the pawl end of the pawl coupling sleeve (2), and when the piston sleeve (5) moves upwards to the position where the top end of the piston sleeve abuts against the lower end face of the first annular limiting step, the bottom end face of the piston sleeve (5) is flush with the sleeve bottom end face of the pawl coupling sleeve (2) or higher than the sleeve bottom end face of the pawl coupling sleeve (2).
9. The releasing device for oil and gas well completion according to claim 1, characterized in that the outer wall of the lower sleeve part of the pawl coupling sleeve (2) is recessed inwards to form a fifth annular limiting step, and a fourth sealing ring (10) is arranged on the outer wall of the sleeve below the fifth annular limiting step.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922171079.5U CN211397517U (en) | 2019-12-06 | 2019-12-06 | Releasing device for well completion of oil and gas well |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922171079.5U CN211397517U (en) | 2019-12-06 | 2019-12-06 | Releasing device for well completion of oil and gas well |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211397517U true CN211397517U (en) | 2020-09-01 |
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ID=72231052
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922171079.5U Active CN211397517U (en) | 2019-12-06 | 2019-12-06 | Releasing device for well completion of oil and gas well |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211397517U (en) |
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2019
- 2019-12-06 CN CN201922171079.5U patent/CN211397517U/en active Active
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20210222 Address after: 300457 Tianjin Binhai New Area Development Zone Second Avenue 83, China Petroleum Tianjin building Bohai Drilling Engineering Co., Ltd. Patentee after: CNPC Bohai Drilling Engineering Co.,Ltd. Patentee after: CHINA NATIONAL PETROLEUM Corp. Address before: 300457 Tianjin Binhai New Area Development Zone Second Avenue 83, China Petroleum Tianjin building Bohai Drilling Engineering Co., Ltd. Patentee before: CNPC Bohai Drilling Engineering Co.,Ltd. |
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| TR01 | Transfer of patent right |