CN205189781U - A back -off connects that is used for in pit right -hand thread drilling tool to salvage - Google Patents
A back -off connects that is used for in pit right -hand thread drilling tool to salvage Download PDFInfo
- Publication number
- CN205189781U CN205189781U CN201521024216.8U CN201521024216U CN205189781U CN 205189781 U CN205189781 U CN 205189781U CN 201521024216 U CN201521024216 U CN 201521024216U CN 205189781 U CN205189781 U CN 205189781U
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- drilling tool
- hand thread
- thread
- connect
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Abstract
The utility model discloses a right -hand thread drilling tool salvaging method and the back -off that uses connect in the pit, the one end that connects of back -off be provided with the internal thread, the other end is put in and is kept off on the back -off connects through the circlip card behind the eccentric guide, is provided with the motion inclined plane on the butt joint face that eccentric guide and back -off connect, is provided with the retaining ledge on the motion inclined plane, simultaneously the back -off connect and the outer wall of eccentric guide on be provided with the external screw thread of same pitch. The utility model discloses need not the left -hand thread drilling tool and can directly carry out fishing operation, reduce the processing required time of accident, very big simplification the accident processing procedure, reduced accident handling time, practice thrift the drilling cost, and need not to lift the back -off that can realize the back -off operation and connect, solved and proposed unable accurate being used in by the technical problem on the fishing tool of drawing the tonnage owing to receive wall of a well friction in the horizontal well operation, improve the salvage success rate.
Description
Technical field
The utility model relates to a kind of back-off joint salvaged for down-hole right-hand thread drilling tool, belongs to downhole tool fishing operation field.
Background technology
Along with the development of petroleum and natural gas production technique, drilling depth is constantly deepened, and this just causes drilling failure more frequent and complicated.At present, in drilling process, there is drilling rod down-hole lock of tool drilling, all adopt bumper jar to carry out jarring releasing, if jarring cannot unfreezing, general adopt back-off after overlap milling unfreezing.In back-off operation, need special left-hand thread drilling tool, and a whole set of left-hand thread drilling tool not to be each drilling crew can both lay at any time, generally can only zero time allotment.So just waste the time greatly, add drilling cost, but also likely in the process waited for, occur second accident, result in greater loss.
Original reversing tool, as left hand fishing spear, salvage after fish, must provide the pulling force that is carried, then just can carry out back-off operation, this salvaging mode is no problem in straight well operation, but in extended reach well and horizontal well operation, owing to being subject to the impact of wall friction, lift tonnage cannot act on instrument accurately, causes and cannot complete back-off operation.In addition, most reversing tool, grabs the slip element dragging for back-off part and have hardness high, if back-off failure, the slip element that hardness is high must stay TOF, for follow-up salvaging or back-off operation increase difficulty.
Utility model content
The back-off joint salvaged for down-hole right-hand thread drilling tool that the utility model provides a kind of simple to operate, fishing success ratio high, thus realize directly to carry out fishing without the need to left-hand thread drilling tool, reduce the time needed for accident settlement, greatly simplify incident processing procedure, decrease break down time, save drilling cost.
The technical solution of the utility model: a kind of back-off joint salvaged for down-hole right-hand thread drilling tool, one end of described back-off joint is provided with internal thread, the other end to put after eccentric pin bush by circlip block on back-off joint, the interface of eccentric pin bush and back-off joint is provided with motion inclined-plane, motion inclined-plane is provided with retaining ledge, on the outer wall of back-off joint and eccentric pin bush, is provided with the external screw thread of same pitch simultaneously.
Further, motion inclined-plane is also provided with the unlock hole vertical with back-off connector center line.
Described internal thread and external screw thread are taper thread.
Eccentric distance e on described eccentric pin bush is 1 ~ 3mm.
Owing to adopting technique scheme, the utility model has the advantage of:
1, the utility model directly can carry out fishing without the need to left-hand thread drilling tool, reduces the time needed for accident settlement, greatly simplify incident processing procedure, decrease break down time, saves drilling cost;
2, Refloatation method of the present utility model is without the need to above carrying the back-off joint that can realize back-off operation, solves the technical problem lifting tonnage and cannot act on accurately on salvaged instrument owing to being subject to wall friction in horizontal well operation, improves fishing success ratio;
3, not only structure is simple, easy to make for back-off joint of the present utility model, and back-off part is exactly generic connectivity screw thread, does not need special proterctive equipment, only needs common thread protector, is convenient to protection, transport and stores;
4, even if high less than hardness on back-off joint of the present utility model slip element, back-off failure, also can not be that follow-up salvaging or back-off operation increase difficulty;
5, back-off joint of the present utility model can use as common crossover sub, and universality is higher.
Accompanying drawing explanation
Fig. 1 is the structural representation of back-off joint in the utility model;
Fig. 2 is the A-A sectional view of Fig. 1;
Fig. 3 is the B-B sectional view of Fig. 1;
Fig. 4 is the deployed configuration schematic diagram on motion inclined-plane in the utility model.
Description of reference numerals: 1-internal thread, 2-back-off joint, 3-eccentric pin bush, 4-circlip, 5-external screw thread, 6-motion inclined-plane, 7-retaining ledge, 8-unlock hole.
Detailed description of the invention
In order to make the utility model object, technical scheme and advantage clearly, below in conjunction with drawings and Examples, the utility model is described in further detail.
Embodiment of the present utility model: a kind of structural representation of the back-off joint for the salvaging of down-hole right-hand thread drilling tool as shown in Figures 1 and 2, one end of described back-off joint 2 is provided with internal thread 1, the other end to put after eccentric pin bush 3 by circlip 4 block on back-off joint 2, and the eccentric distance e on described eccentric pin bush 3 is 1 ~ 3mm; Eccentric pin bush 3 interface with back-off joint 2 is provided with motion inclined-plane 6, see Fig. 4, motion inclined-plane 6 is provided with retaining ledge 7, on the outer wall of back-off joint 2 and eccentric pin bush 3, be provided with the external screw thread 5 of same pitch simultaneously.See Fig. 3, motion inclined-plane 6 is also provided with the unlock hole 8 with back-off joint 2 central axis.Described internal thread 1 and external screw thread 5 are taper thread, so just can utilize the guide effect of taper thread, improve docking efficiency.
Operating principle of the present utility model: before salvaging right-hand thread drilling tool, first be connected with bottom work drill string by the internal thread 1 on back-off joint 2, and each connecting thread tightened with maximum recommendation moment of torsion on work drill string, when work drill string go into the well encounter salvaged right-hand thread drilling tool time, rotate forward work drill string, can not relatively rotate because the retaining ledge 7 between back-off joint 2 and eccentric pin bush 3 limits, thus the back-off joint 2 bottom work drill string is screwed into right-hand thread drilling tool, now reversely rotate work drill string, back-off joint 2 and eccentric pin bush 3 are relatively rotated along the inclined-plane 6 that moves, owing to there is eccentric throw between back-off joint 2 and eccentric pin bush 3, during applying reactive torque, back-off joint 2 staggers mutually with the external screw thread 5 on eccentric pin bush 3 outer wall, thus salvaged right-hand thread drilling tool is pinned connection at once, continue reversion and open the connecting thread of back-off joint 2 bottom, so just can on carry work drill string the right-hand thread drilling tool opened tripped out from down-hole.In said process, the maximum recommended moment of torsion rotating forward work drill string need be greater than the peak torque of reverse rotation work drill string, be for opening from work drill string inside when preventing work drill string from reversely rotating like this, wherein maximum recommended moment of torsion can check in from " drilling tool handbook " according to the model of work drill string and specification.
After right-hand thread drilling tool is salvaged, first back-off joint 2 is unloaded from work drill string, back-off joint 2 is found out unlock hole 8, then a polished rod is inserted in unlock hole 8, thus back-off joint 2 and guide 3 cannot be relatively rotated when reversing, now reversely rotating back-off joint 2, so just can dismantle salvaging the right-hand thread drilling tool got up from back-off joint 2.
Claims (4)
1. the back-off joint salvaged for down-hole right-hand thread drilling tool, it is characterized in that: one end of described back-off joint (2) is provided with internal thread (1), the other end puts eccentric pin bush (3) and passes through circlip (4) block afterwards on back-off joint (2), the interface of eccentric pin bush (3) with back-off joint (2) is provided with motion inclined-plane (6), motion inclined-plane (6) are provided with retaining ledge (7), on the outer wall of back-off joint (2) and eccentric pin bush (3), are provided with the external screw thread (5) of same pitch simultaneously.
2. the back-off joint salvaged for down-hole right-hand thread drilling tool according to claim 1, is characterized in that: on motion inclined-plane (6), be also provided with the unlock hole (8) with back-off joint (2) central axis.
3. the back-off joint salvaged for down-hole right-hand thread drilling tool according to claim 1, is characterized in that: described internal thread (1) and external screw thread (5) are taper thread.
4. the back-off joint salvaged for down-hole right-hand thread drilling tool according to claim 1, is characterized in that: the eccentric distance e on described eccentric pin bush (3) is 1 ~ 3mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521024216.8U CN205189781U (en) | 2015-12-11 | 2015-12-11 | A back -off connects that is used for in pit right -hand thread drilling tool to salvage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521024216.8U CN205189781U (en) | 2015-12-11 | 2015-12-11 | A back -off connects that is used for in pit right -hand thread drilling tool to salvage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205189781U true CN205189781U (en) | 2016-04-27 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201521024216.8U Active CN205189781U (en) | 2015-12-11 | 2015-12-11 | A back -off connects that is used for in pit right -hand thread drilling tool to salvage |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205189781U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111042751A (en) * | 2019-11-25 | 2020-04-21 | 贵州高峰石油机械股份有限公司 | Pulse torsion reversing device for well repair |
-
2015
- 2015-12-11 CN CN201521024216.8U patent/CN205189781U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111042751A (en) * | 2019-11-25 | 2020-04-21 | 贵州高峰石油机械股份有限公司 | Pulse torsion reversing device for well repair |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |