CN202108453U - Bushing back-off restrictor - Google Patents
Bushing back-off restrictor Download PDFInfo
- Publication number
- CN202108453U CN202108453U CN2011202078854U CN201120207885U CN202108453U CN 202108453 U CN202108453 U CN 202108453U CN 2011202078854 U CN2011202078854 U CN 2011202078854U CN 201120207885 U CN201120207885 U CN 201120207885U CN 202108453 U CN202108453 U CN 202108453U
- Authority
- CN
- China
- Prior art keywords
- mandrel
- bushing
- block teeth
- sleeve pipe
- vertical dog
- 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 - Fee Related
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- Earth Drilling (AREA)
Abstract
The utility model relates to a bushing back-off restrictor for workover in a petroleum industry, which mainly comprises: an upper joint, a mandrel, an upper pressure ring, a vertical dog, a lower pressure ring, a retainer cap, a connecting block and a lower joint. A cross section of the mandrel is in an elliptical shape; the upper joint is provided on a top end of the mandrel; the retainer cap and the lower joint are provided on a bottom of the mandrel; the vertical dog is provided in a middle of the mandrel; the upper and lower pressure rings are respectively provided on upper and lower sides of the vertical dog; the vertical dog is constituted by two semicircle dogs and the connecting block; the two semicircle dogs are movably connected by the connecting block; an outer side of the vertical dog is anchored on an inner wall of a bushing; and an inner side of the vertical dog passes through the elliptical mandrel. According to the utility model, the restrictor is anchored in a position of the bushing under the damaged bushing and then the damaged bushing is back-off, thereby preventing releasing of the lower bushing owing to loosing of screw threads, avoiding accident expansion and reducing economic losses; and additionally, the restrictor is convenient to use and simple to operate.
Description
Technical field:
The utility model relates to the downhole tool that a kind of petroleum industry is used, particularly a kind of sleeve pipe back-off stop.
Background technology:
At present, during existing oilfield downhole operation, when changing the sleeve pipe of a certain breakage; The general conventional method that adopts is next the root sleeve pipe place at damaged sleeve pipe, drags for the down-hole casing fishing spear, carries drilling tool on then; Upwards apply certain strength, at this moment, drag for lance and increase with the screw thread expanding force between the setting of casing; Again the damaged sleeve pipe that drags for more than the lance is carried out back-off, so just can damaged sleeve pipe be poured out.But the problem of its existence is: use this way, the fishing tool of grappling sleeve pipe must move back, so that after accomplishing mission, can withdraw from smoothly, otherwise, still can make the accident extension.In addition, the anchor tooth that longitudinal pulling force can be provided must be horizontal, if on the pulling force carried improper, in the process of reversed stream pipe, can occur that the anchor tooth skids, grappling does not live the sleeve pipe phenomenon, influence normal reversed stream.Even the great work accident poured out together of the sleeve pipe that the lance below possibly occur dragging for, even cause disused well, and then produce into enormous economic loss.
Summary of the invention:
The purpose of the utility model is exactly the above-mentioned defective that exists to prior art, and a kind of sleeve pipe back-off stop is provided, the sleeve pipe that can control damaged sleeve pipe below can be owing to misoperation back-off, enormous economic loss takes place.
Its technical scheme is: mainly be made up of top connection, mandrel, upper press ring, perpendicular block teeth, following pressure ring, retaining cap, contiguous block and lower contact; The cross section of described mandrel is oval, and the top of mandrel is provided with top connection, and the bottom is provided with retaining cap and lower contact; The centre is provided with perpendicular block teeth; The upper and lower sides of perpendicular block teeth is respectively equipped with upper press ring and following pressure ring, and described perpendicular block teeth are made up of two semicircle block teeth and contiguous block, and two semicircle block teeth flexibly connect through contiguous block; The outside and the internal surface of sleeve pipe grappling of perpendicular block teeth, oval-shaped mandrel is passed in the inboard of perpendicular block teeth.
The top of above-mentioned top connection is provided with internal thread, can be connected with drilling rod.
The beneficial effect of the utility model is: fix through spacing next root sleeve pipe place at damaged sleeve pipe; Again to damaged sleeve pipe back-off; Can effectively avoid down square casing and open down the parts casing pipe accident, avoid bigger economic loss because screw thread connects the mistake that does not tightly cause; In addition, it is easy to use, and is simple to operate, is convenient to promote the use of.
Description of drawings:
Accompanying drawing 1 is the structural representation of the utility model;
Accompanying drawing 2 is perpendicular block teeth sketch mapes of the utility model;
Among the last figure: internal thread 1, top connection 2, mandrel 3, upper press ring 4, perpendicular block teeth 5, pressure ring 6, retaining cap 7, contiguous block 8, lower contact 9 down.
The specific embodiment:
In conjunction with accompanying drawing 1-2, the utility model is done further to describe:
The utility model mainly is made up of top connection 2, mandrel 3, upper press ring 4, perpendicular block teeth 5, following pressure ring 6, retaining cap 7, contiguous block 8 and lower contact 9; The cross section of described mandrel 3 is oval, and the top of mandrel 3 is provided with top connection 2, and the bottom is provided with retaining cap 7 and lower contact 9; The centre is provided with perpendicular block teeth 5; The upper and lower sides of perpendicular block teeth 5 is respectively equipped with upper press ring 4 and following pressure ring 6, and described perpendicular block teeth 5 are made up of two semicircle block teeth and contiguous block 8, and two semicircle block teeth flexibly connect through contiguous block 8; The outside and the internal surface of sleeve pipe grappling of perpendicular block teeth 5, oval-shaped mandrel 3 is passed in the inboard of perpendicular block teeth 5.
The top of above-mentioned top connection 2 is provided with internal thread 1, can be connected with drilling rod.
During use, the utility model down to next root sleeve pipe of damaged sleeve pipe, then, is rotated the mandrel 3 that drilling rod drives elliptic cross-section; Become big extruding block teeth through axle diameter and expand, make block teeth inwall grappling tightly and sleeve pipe, fixedly drilling rod; Limit down the rotation of square casing, then, damaged sleeve pipe is carried out back-off; Like this, can avoid down square casing, avoid bigger economic loss because the loosening mistake that causes of screw thread is opened down the parts casing pipe accident; In addition, it is easy to use, and is simple to operate, is convenient to promote the use of.
Claims (2)
1. sleeve pipe back-off stop; It is characterized in that: mainly form by top connection (2), mandrel (3), upper press ring (4), perpendicular block teeth (5), following pressure ring (6), retaining cap (7), contiguous block (8) and lower contact (9); The cross section of described mandrel (3) is oval, and the top of mandrel (3) is provided with top connection (2), and the bottom is provided with retaining cap (7) and lower contact (9); The centre is provided with perpendicular block teeth (5); The upper and lower sides of perpendicular block teeth (5) is respectively equipped with upper press ring (4) and following pressure ring (6), and described perpendicular block teeth (5) are made up of two semicircle block teeth and contiguous block (8), and two semicircle block teeth flexibly connect through contiguous block (8); The outside and the internal surface of sleeve pipe grappling of perpendicular block teeth (5), oval-shaped mandrel (3) is passed in the inboard of perpendicular block teeth (5).
2. sleeve pipe back-off stop according to claim 1 is characterized in that: the top of described top connection (2) is provided with internal thread (1) and is connected with drilling rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202078854U CN202108453U (en) | 2011-06-20 | 2011-06-20 | Bushing back-off restrictor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202078854U CN202108453U (en) | 2011-06-20 | 2011-06-20 | Bushing back-off restrictor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202108453U true CN202108453U (en) | 2012-01-11 |
Family
ID=45433889
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011202078854U Expired - Fee Related CN202108453U (en) | 2011-06-20 | 2011-06-20 | Bushing back-off restrictor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202108453U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110725658A (en) * | 2019-10-14 | 2020-01-24 | 中国石油化工股份有限公司 | Radial anchoring inverted-buckling casing taking and replacing device and method |
| CN110836096A (en) * | 2018-08-15 | 2020-02-25 | 中国石油天然气股份有限公司 | Casing coupling back-off device and using method |
-
2011
- 2011-06-20 CN CN2011202078854U patent/CN202108453U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110836096A (en) * | 2018-08-15 | 2020-02-25 | 中国石油天然气股份有限公司 | Casing coupling back-off device and using method |
| CN110836096B (en) * | 2018-08-15 | 2022-03-01 | 中国石油天然气股份有限公司 | Casing coupling back-off device and using method |
| CN110725658A (en) * | 2019-10-14 | 2020-01-24 | 中国石油化工股份有限公司 | Radial anchoring inverted-buckling casing taking and replacing device and method |
| CN110725658B (en) * | 2019-10-14 | 2022-05-03 | 中国石油化工股份有限公司 | Radial anchoring inverted-buckling casing taking and replacing device and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120111 Termination date: 20130620 |