CN201738832U - Back-off safety joint - Google Patents
Back-off safety joint Download PDFInfo
- Publication number
- CN201738832U CN201738832U CN201020251927XU CN201020251927U CN201738832U CN 201738832 U CN201738832 U CN 201738832U CN 201020251927X U CN201020251927X U CN 201020251927XU CN 201020251927 U CN201020251927 U CN 201020251927U CN 201738832 U CN201738832 U CN 201738832U
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- Prior art keywords
- joint
- safety joint
- safety
- shear pin
- lower contact
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- Expired - Lifetime
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Abstract
The utility model provides a back-off safety joint, and aims to overcome the shortcoming that objects falling to the well bottom is increased, requiring more efforts to deal with in later period because the conventional left-handed safety joint and a shear pin safety joint have poor reliability and are easy to break off in midway. The back-off safety joint adopts the structure that the upper end of a lower joint is mounted in and fixedly connected with an inner hole at the lower end of an upper joint and through a shear pin in radial arrangement, connecting threads adopting left-hand threads are formed at the upper end of the lower joint, the inner hole at the lower end of the upper joint takes an internal hexagonal shape, and the external hexagon of the lower joint is matched with the internal hexagon of the upper joint. The back-off safety joint has the benefits of simple structure and convenient operation and can be prevented from disconnection. Even if the safety joint breaks off, the lower joint and fishing tools left in the well can be fished out easily, so that secondary object dropping and complex accidents can not be caused.
Description
Affiliated technical field
The utility model relates to a kind of and the supporting downhole tool of oil field exceptional well lower tubular column, but particularly relates to a kind of and the supporting back-off safety joint of down-hole operating tool string unfreezing.
Background technology
In the oil and gas development operation, safety joint is the special tool(s) that is used for underground work and flow string.Its effect is when down-hole string has an accident, and can throw off from safety joint meeting the card tubing string, thereby be the good condition of further processing creation of accident.Safety joint generally is used in the comparatively complicated construction well of tubular column structure and has in the well that special operation requires.At present safety joint commonly used mainly contains two kinds of left-hand thread formula and shear pin formulas (Fig. 1) in straight well.The top connection of left-hand thread formula safety joint is connected by left hand thread with lower contact, when tubing string after card is met in the down-hole, need clockwise rotate tubing string, not in place if the complicated moment of torsion of hole condition transmits, safety joint is difficult to open, success rate is low, reliability is relatively poor; And the safety joint of conventional shear pin formula only depends on shear pin connect to go up lower contact, is subjected to the influence (as: well head, lowering velocity too fast etc.) of operation and hole condition in the completion practice easily and causes disconnected taking off midway, causes work accident.Above-mentioned safety joint can't continue to implement the back-off fishing when handling tubing string activity unfreezing is invalid, and is retained in a part in the well, causes bottom hole falling article to increase, and the post-processed difficulty strengthens.
The utility model content
In order to overcome existing left-hand thread formula safety joint and shear pin formula safety joint reliability is relatively poor, disconnected taking off easily midway, cause bottom hole falling article to increase, the deficiency that the post-processed difficulty strengthens, but the utility model provides a kind of back-off safety joint.
The technical scheme that its technical problem that solves the utility model adopts is: but the back-off safety joint comprises top connection, lower contact, shear pin, top connection is fixedlyed connected by the shear pin of radially installing with lower contact, and there is connecting thread the upper end of lower contact; The connecting thread of lower contact upper end is a left hand thread; Top connection lower end endoporus is interior six squares, and outer six sides of lower contact match with interior six sides of top connection.
The beneficial effects of the utility model are, and are simple in structure, are convenient to operation, prevent that safety joint from throwing off the generation of phenomenon; Safety joint stays the lower contact of well and fishing tool to pull out easily after throwing off, and can not cause the generation of secondary junk and complex accident thereof.
Description of drawings
Fig. 1 is known shear pin formula safety joint schematic diagram.
But Fig. 2 is the utility model back-off safety joint structural representation.
Among the figure: 1. top connection, 2. lower contact, 3. shear pin, 4. connecting thread.
The specific embodiment
The utility model is described in further detail below in conjunction with accompanying drawing 2 and embodiment.
But the safety joint of the utility model back-off comprises top connection 1, lower contact 2, and top connection 1 is fixedlyed connected by the shear pin of radially installing 3 with lower contact 2, and there is connecting thread 4 lower contact 2 upper ends that are arranged in top connection 1 endoporus, and connecting thread 4 is a left hand thread.
Shape when top connection 1 and lower contact 2 junctions is not that circular effect is better, can realize the moment of torsion transmission.Usually top connection 1 lower end endoporus is interior six squares, and outer six sides of lower contact 2 match with interior six sides of top connection 1.
But the safety joint of the utility model back-off is simple in structure, be installed in fishing tool top, drag for obtain fish after, can in shear pin safe load scope, carry out the activity unfreezing, if the invalid six side's work plane transfer torques that utilize of unfreezing carry out back-off operation, if back-off invalid can by on carry fishing string to safety joint load and surpass the shear pin design load after shear pin cut off, realize that tubing string slips out of the hand.In case after slipping out of the hand, it is sinistral external thread that the top of well part is stayed in safety joint, can adopt the drilling tool or the reverse buckling equipment bottom of opposite button-type to connect a recovery joint, down to TOF, the rotation tubing string can be realized and stay being connected of well parts, being rotated further tubing string can will stay well partly to open, and realize that safety reclaims.
Claims (3)
1. but a back-off safety joint comprises top connection, lower contact, shear pin, and the upper end of lower contact is installed in the endoporus of top connection lower end, and fixedly connected by the shear pin of radially installing, it is characterized in that: there is connecting thread (4) upper end of lower contact (2).
2. but back-off safety joint according to claim 1 is characterized in that: the connecting thread (4) of described lower contact (2) upper end is a left hand thread.
3. but back-off safety joint according to claim 2 is characterized in that: described top connection (1) lower end endoporus is interior six squares, and outer six sides of lower contact (2) match with interior six sides of top connection (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020251927XU CN201738832U (en) | 2010-06-29 | 2010-06-29 | Back-off safety joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020251927XU CN201738832U (en) | 2010-06-29 | 2010-06-29 | Back-off safety joint |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201738832U true CN201738832U (en) | 2011-02-09 |
Family
ID=43554110
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201020251927XU Expired - Lifetime CN201738832U (en) | 2010-06-29 | 2010-06-29 | Back-off safety joint |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201738832U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106285512A (en) * | 2016-10-10 | 2017-01-04 | 贵州高峰石油机械股份有限公司 | A kind of eccentric centralizer and using method thereof |
| CN109113684A (en) * | 2018-10-28 | 2019-01-01 | 中国石油化工股份有限公司 | Small casing producing well mechanical sand control method and mechanical sand control tubing string and fishing tool |
| CN109854213A (en) * | 2019-03-18 | 2019-06-07 | 中国石油化工股份有限公司 | Set damage repairs the sand control pipe of well |
-
2010
- 2010-06-29 CN CN201020251927XU patent/CN201738832U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106285512A (en) * | 2016-10-10 | 2017-01-04 | 贵州高峰石油机械股份有限公司 | A kind of eccentric centralizer and using method thereof |
| CN106285512B (en) * | 2016-10-10 | 2018-10-30 | 贵州高峰石油机械股份有限公司 | A kind of bias centralizer and its application method |
| CN109113684A (en) * | 2018-10-28 | 2019-01-01 | 中国石油化工股份有限公司 | Small casing producing well mechanical sand control method and mechanical sand control tubing string and fishing tool |
| CN109854213A (en) * | 2019-03-18 | 2019-06-07 | 中国石油化工股份有限公司 | Set damage repairs the sand control pipe of well |
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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: 20110209 |