CN201013255Y - Back-off sub - Google Patents
Back-off sub Download PDFInfo
- Publication number
- CN201013255Y CN201013255Y CNU2007201037526U CN200720103752U CN201013255Y CN 201013255 Y CN201013255 Y CN 201013255Y CN U2007201037526 U CNU2007201037526 U CN U2007201037526U CN 200720103752 U CN200720103752 U CN 200720103752U CN 201013255 Y CN201013255 Y CN 201013255Y
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- CN
- China
- Prior art keywords
- sub
- utility
- model
- sliding bush
- lower joint
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Abstract
The utility model provides a novel back off sub corollary to an oil field completion string, and is applicable for large pitch directional wells and horizontal wells. The utility model comprises an upper joint (1), a lower joint (2), a sliding bush core (3), a lock ball (4) and a cutting nail (5). The utility model is characterized in that the upper joint (1) is connected with the lower joint (2); the sliding bush core (3) is arranged in the upper joint (1); the lock ball (4) is arranged between the lower joint (2) and the sliding bush core (3); the lower joint (2) is connected with the sliding bush core (3) through the cutting nail (5). By adopting the novel back off sub, bowling or pressurization is not adopted for releasing. When the utility model is used in large pitch directional wells and horizontal wells, the problem that iron shots can not be put in place for pressurization and sealing fails is prevented. In addition, a dead water pressure relief passage is designed, the defect that water in dead water areas is incompressible, and releasing fails is overcome.
Description
Technical field
The utility model discloses the matching used novel back-off sub of a kind of oilfield well completion tubing string, be applicable to high-inclination directional well and horizontal well.
Background technology
High-inclination directional well and horizontal well completion can use often with a part of completion tubular column trip out pit shaft, a part of completion tubular column is stayed the well-completing process in the well, often in this process uses back-off sub to finish the tubing string mask work.The mode that common back-off sub adopts pitching to give up is applicable to straight well, the problem that when high-inclination directional well and horizontal well use, exists steel ball can not put in place and seal, and the success rate of giving up can not guarantee; Part back-off sub does not simultaneously design tubing string stagnant water current by pass, because the Incoercibility of water, in actual use, the success rate of giving up can not guarantee.
Summary of the invention
The purpose of this utility model provides a kind of back-off sub that is applicable to high-inclination directional well and horizontal well completion, reaches the reliable purpose of giving up, and overcomes the deficiency that existing back-off sub is used in high-inclination directional well and horizontal well.
The technical solution adopted in the utility model is:
Comprise top connection 1, lower contact 2, sliding sleeve fuse 3, lock ball 4, shear pin 5, top connection 1 is connected with lower contact 2, is provided with sliding sleeve fuse 3 in the top connection 1, between lower contact 2 and the sliding sleeve fuse 3 lock ball 4 is housed, and lower contact 2 is connected by shear pin 5 with sliding sleeve fuse 3.
Advantage of the present utility model is: be applicable to high-inclination directional well and horizontal well.The not pitching technology of giving up realizes that completion tubular column is reliably given up in high-inclination directional well or the horizontal well; Design stagnant water pressure release passage, the Incoercibility of consideration water has improved the reliability of giving up.
Description of drawings
Accompanying drawing back-off sub structural representation
The specific embodiment
As shown in drawings, mainly form by top connection 1, lower contact 2, sliding sleeve fuse 3, lock ball 4, shear pin 5.
Tubing string is lowered in high-inclination directional well or the horizontal well, when completion is given up, and not pitching, ground is suppressed, and pump pressure is about 28MPa, and sliding sleeve fuse 3 disconnected shear pins 5 are descending, discharge lock ball 4, upper lifting pipe post and back-off sub top connection 1 realize giving up, and back-off sub top connection 1 above tubing string separates with down-hole string.
Tubing string is gone into well when giving up, not pitching, and ground is suppressed, and it is descending that the sliding sleeve fuse is cut off shear pin, discharges lock ball, and the upper lifting pipe post is realized giving up, and the above tubing string of back-off sub top connection separates with down-hole string.The mode that this novel back-off sub adopts not pitching to build the pressure is given up, and application has been avoided steel ball not seal and put the defective that can not give up in place in high-inclination directional well and horizontal well; Designed the stagnant water pressure release passage simultaneously, the incompressible defective that to give up that causes of the water that has overcome slough when giving up.
Claims (1)
1. back-off sub, comprise top connection (1), lower contact (2), sliding sleeve fuse (3), lock ball (4), shear pin (5), it is characterized in that: top connection (1) is connected with lower contact (2), be provided with sliding sleeve fuse (3) in the top connection (1), between lower contact (2) and the sliding sleeve fuse (3) lock ball (4) is housed, lower contact (2) is connected by shear pin (5) with sliding sleeve fuse (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201037526U CN201013255Y (en) | 2007-03-07 | 2007-03-07 | Back-off sub |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201037526U CN201013255Y (en) | 2007-03-07 | 2007-03-07 | Back-off sub |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201013255Y true CN201013255Y (en) | 2008-01-30 |
Family
ID=39025041
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007201037526U Expired - Lifetime CN201013255Y (en) | 2007-03-07 | 2007-03-07 | Back-off sub |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201013255Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104458443A (en) * | 2013-09-25 | 2015-03-25 | 中国石油化工股份有限公司 | Interlaminar shear resistant strength testing method |
| CN105937369A (en) * | 2016-06-28 | 2016-09-14 | 中国石油天然气股份有限公司 | Retractable high-pressure sealing tie-back device with locking mechanism |
| CN106499350A (en) * | 2016-12-01 | 2017-03-15 | 孙东生 | A kind of waterpower solution lock-switch and packer control device |
| CN108019159A (en) * | 2016-11-04 | 2018-05-11 | 天津汇铸石油设备科技有限公司 | Mechanical back-off sub |
-
2007
- 2007-03-07 CN CNU2007201037526U patent/CN201013255Y/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104458443A (en) * | 2013-09-25 | 2015-03-25 | 中国石油化工股份有限公司 | Interlaminar shear resistant strength testing method |
| CN104458443B (en) * | 2013-09-25 | 2017-10-17 | 中国石油化工股份有限公司 | Anti- interlaminar shear strength method of testing |
| CN105937369A (en) * | 2016-06-28 | 2016-09-14 | 中国石油天然气股份有限公司 | Retractable high-pressure sealing tie-back device with locking mechanism |
| CN105937369B (en) * | 2016-06-28 | 2019-02-15 | 中国石油天然气股份有限公司 | A kind of reversible high pressure sealing tieback assembly of with locking mechanism |
| CN108019159A (en) * | 2016-11-04 | 2018-05-11 | 天津汇铸石油设备科技有限公司 | Mechanical back-off sub |
| CN106499350A (en) * | 2016-12-01 | 2017-03-15 | 孙东生 | A kind of waterpower solution lock-switch and packer control device |
| CN106499350B (en) * | 2016-12-01 | 2018-11-30 | 孙东生 | A kind of waterpower solution lock-switch and packer control device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20080130 |