CN103670310A - Releasing tool for releasing string - Google Patents
Releasing tool for releasing string Download PDFInfo
- Publication number
- CN103670310A CN103670310A CN201210351621.5A CN201210351621A CN103670310A CN 103670310 A CN103670310 A CN 103670310A CN 201210351621 A CN201210351621 A CN 201210351621A CN 103670310 A CN103670310 A CN 103670310A
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- China
- Prior art keywords
- sealing ring
- groove
- embedded
- releasing
- sealing
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Abstract
A releasing tool for a releasing string comprises an upper joint 1, a sealing ring, a sealing ring A, a shear pin, a locking claw, a sealing ring B, a sliding sleeve, an outer sleeve 8, a sealing ring C and a lower joint. The releasing tool is characterized in that the sealing ring 2 is embedded in a sealing groove of the upper joint 1,, the sealing ring A 3 is embedded in a sealing groove of the sliding sleeve, the sealing ring B is embedded in a sealing groove of the locking claw 5, and the sealing ring C is embedded in a sealing groove of the outer sleeve 8. the upper joint 1 is in threaded connection with the locking claw 5, the lower end of the locking claw 5 is inserted in a locking claw groove of the outer sleeve 8, the sliding sleeve with the sealing ring A mounted is mounted in an inner hole of the upper joint, the outer sleeve 8 is in threaded connection with the lower joint, and the shear pin is mounted in a shear pin groove of the sliding groove through a threaded hole of the locking claw. The releasing tool has the advantages that oil tube round threads are used for the upper end of the upper joint and the lower end of the lower joint, so that the oil tube can be connected with other tools conveniently; a soft sealing rubber plug pressing mode is used for achieving releasing, so that the releasing tool is simple, low in utilization cost and convenient to mount.
Description
Technical field
The invention belongs to oil field equipment, relate to oilfield machinery water blockoff field, specifically, particularly relate to a kind of releasing tool for Back-off Pipe String for horizontal well.
Background technology
Late period of oil field, difficult exploiting field piece increases, and water injection pressure is high, and seperated layer water injection, layering squeezing down-hole string technology status more complicated, had a strong impact on oil field and normally produced.Development along with outlook for mechanical water plugging technology, the back-off sub of ball-throwing type and reverse buckling type back-off sub can not meet construction requirement completely, adopt the pitching mode of building the pressure to give up, while applying in high-inclination directional well and horizontal well, being prone to steel ball can not seal and put in place, cause giving up, though existing technology has solved the problems referred to above to a certain extent, but due to its unreasonable structure, cause install and use loaded down with trivial details, the problems such as inefficiency, working string can not normally be tripped out, even cause oil-water well heavy repair task, solve problems and must releasing tool structure design, thoroughly eliminate accident potential.And some completion pipe string is because not allowing the reasons such as rotation can not adopt the back-off operating type of giving up, and to construction, has brought very large trouble.For this situation, developed the existing safe releasing tool for horizontal well, its construction safety, is a kind of reliable hydraulic releasing tool.Without back-off or pitching, simple to operate, avoided steel ball not seal and put in place, the defect that can not give up, the poor ability of pressure-bearing of raising downhole tool and tubing string.
Summary of the invention
The object of the invention is for the weak point in existing technology, only provide and need the pin of giving up have been cut off to mode by adopting oil pipe to suppress, annular space is communicated with, overcoat, the following process pipe string of lower contact can be lost to a kind of releasing tool for Back-off Pipe String for horizontal well in well.
The present invention is achieved by the following technical solutions:
A kind of releasing tool for Back-off Pipe String, comprise top connection, sealing ring, sealing ring A, shear pin, lock pawl, sealing ring B, sliding sleeve, overcoat, sealing ring C, lower contact, the seal groove that it is characterized in that described top connection is embedded in sealing ring, the seal groove of sliding sleeve is embedded in sealing ring A, the seal groove of lock pawl is embedded in sealing ring B, the seal groove of overcoat is embedded in sealing ring C, top connection is passed through thread connection with lock pawl, the lower end of lock pawl is inserted in the lock pawl groove of overcoat, and the sliding sleeve of first-class sealing ring A is installed in the endoporus of top connection, thread connection is passed through in overcoat and lower contact, screwed hole by shear pin by lock pawl is installed in the shear pin groove of sliding sleeve.
Further illustrate, sealing ring of the present invention has 2, and described sealing ring A has 4, and sealing ring B and sealing ring C respectively have respectively 2.
Groundwork principle of the present invention by: the bottom of back-off sub is connect to process pipe string and is lost when the downhole designs position, in oil pipe, first drop into plug seat in the sealing surface of fuse, pressurize again, cut off shear pin, fuse is descending, seat is situated between in the interior platform of joint, annular space is communicated with, thereby make to lock pawl and lose inner support, now tubing and casing is communicated with, cover overflows to be increased, pressure drop, then upper lifting pipe post, cause is fixing with the bottom tubing string that lower contact is joined, so force in lock pawl and transferred to lower contact and sealing shroud after receipts, thereby by sealing shroud, lower contact and following process pipe string thereof are lost in well, it is in being tripped out.
Usefulness of the present invention is:
A kind of releasing tool for Back-off Pipe String of the present invention, compared with the prior art tool has the following advantages: sealing shroud is connected and tightens with lower contact by screw thread, tightness is strong, and top connection upper end and lower union joint lower end all adopt oil pipe round thread, is conveniently connected with oil pipe and other instruments.Adopt the bruising form of soft seal, plug, from oil pipe by pressurizeing again, cut off shear pin, annular space is communicated with, reaches tubing and casing and be communicated with, cover overflows to be increased, pressure drop, then upper lifting pipe post, loses overcoat, lower contact and following process pipe string thereof in well, reach the object of giving up, simple to operate, by the said structure operating type reliability that guaranteed to give up, its reasonable in design, make that device is simple, use cost is low, easy for installation, saved the cost of production of device.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
In Fig. 1: 1-top connection, 2-sealing ring, 3-sealing ring A, 4-shear pin, 5 lock pawls, 6-sealing ring B, 7-sliding sleeve, 8-overcoat, 9-sealing ring C, 10-lower contact.
The specific embodiment
Below in conjunction with Figure of description, further illustrate the present invention.
A kind of releasing tool for Back-off Pipe String, comprise top connection 1, sealing ring 2, sealing ring A3, shear pin 4, lock pawl 5, sealing ring B6, sliding sleeve 7, overcoat 8, sealing ring C9, lower contact 10, the seal groove that it is characterized in that described top connection 1 is embedded in sealing ring 2, the seal groove of sliding sleeve 7 is embedded in sealing ring A3, the seal groove of lock pawl 5 is embedded in sealing ring B6, the seal groove of overcoat 8 is embedded in sealing ring C9, top connection 1 is passed through thread connection with lock pawl 5, the lower end of lock pawl 5 is inserted in the lock pawl groove of overcoat 8, and the sliding sleeve of first-class sealing ring A 7 is installed in the endoporus of top connection 1, overcoat 8 passes through thread connection with lower contact 10, screwed hole by shear pin 4 by lock pawl 5 is installed in the shear pin groove of sliding sleeve 7.
Claims (2)
1. the releasing tool for Back-off Pipe String, comprise top connection, sealing ring, sealing ring A, shear pin, lock pawl, sealing ring B, sliding sleeve, overcoat, sealing ring C, lower contact, the seal groove that it is characterized in that described top connection is embedded in sealing ring, the seal groove of sliding sleeve is embedded in sealing ring A, the seal groove of lock pawl is embedded in sealing ring B, the seal groove of overcoat is embedded in sealing ring C, top connection is passed through thread connection with lock pawl, the lower end of lock pawl is inserted in the lock pawl groove of overcoat, the sliding sleeve of first-class sealing ring A is installed in the endoporus of top connection, thread connection is passed through in overcoat and lower contact, shear pin is installed in the shear pin groove of sliding sleeve by the screwed hole of lock pawl.
2. a kind of releasing tool for Back-off Pipe String according to claim 1, is characterized in that described sealing ring has 2, and described sealing ring A has 4, and sealing ring B and sealing ring C respectively have respectively 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210351621.5A CN103670310A (en) | 2012-09-19 | 2012-09-19 | Releasing tool for releasing string |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210351621.5A CN103670310A (en) | 2012-09-19 | 2012-09-19 | Releasing tool for releasing string |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103670310A true CN103670310A (en) | 2014-03-26 |
Family
ID=50309000
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210351621.5A Pending CN103670310A (en) | 2012-09-19 | 2012-09-19 | Releasing tool for releasing string |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103670310A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104295262A (en) * | 2014-08-12 | 2015-01-21 | 中国石油集团长城钻探工程有限公司 | Guide pipe well cementation releasing device |
| CN107100572A (en) * | 2017-07-04 | 2017-08-29 | 唐山冀东石油机械有限责任公司 | Gradually deblocking is segmented releasing tool |
| CN117145424A (en) * | 2023-09-07 | 2023-12-01 | 洛阳德佑石油技术有限公司 | Integrated cementing device |
-
2012
- 2012-09-19 CN CN201210351621.5A patent/CN103670310A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104295262A (en) * | 2014-08-12 | 2015-01-21 | 中国石油集团长城钻探工程有限公司 | Guide pipe well cementation releasing device |
| CN107100572A (en) * | 2017-07-04 | 2017-08-29 | 唐山冀东石油机械有限责任公司 | Gradually deblocking is segmented releasing tool |
| CN117145424A (en) * | 2023-09-07 | 2023-12-01 | 洛阳德佑石油技术有限公司 | Integrated cementing device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20140326 |