CN101144372A - Sticking-resistant petroleum sleeve joint - Google Patents
Sticking-resistant petroleum sleeve joint Download PDFInfo
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- CN101144372A CN101144372A CNA2007101347048A CN200710134704A CN101144372A CN 101144372 A CN101144372 A CN 101144372A CN A2007101347048 A CNA2007101347048 A CN A2007101347048A CN 200710134704 A CN200710134704 A CN 200710134704A CN 101144372 A CN101144372 A CN 101144372A
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Abstract
The invention relates to a thread connector, in particular to a thread connector of a thread gluing resistant petroleum casing pipe. According to the technical proposal of the invention, and an external thread piece 1 is meshed and connected with an external thread piece 3 through a coupling 2. The invention is characterized in that the taper of the thread is 1: 6 to 1: 8, the thread pitch of the thread is three teeth per inch, the height of the thread is 2.05 to 2.45 mm, and the tooth crest and the tooth bottom of the thread are parallel to the axial line of a pipe. Compared with the prior art, when being used, the invention is buckled easily, and the thread alternating is not caused easily, and thereby the invention has a good thread gluing resistant performance, simultaneously the speed for screwing on a thread is rapid, as well as the working efficiency under a well is improved.
Description
Technical field
What the present invention relates to is the petroleum casing pipe nipple of a kind of nipple, particularly a kind of sticking-resistant, belongs to the petroleum casing pipe technical field that is threaded.
Background technology
The petroleum casing pipe of oil field use at present, adopt API round thread or buttress thread to connect mostly, the advantage of this screw thread is a technology maturation, processing and detection easily, but also there are a lot of shortcomings simultaneously, its the most outstanding shortcoming is that thread gluing takes place easily, especially reaches 16 inches (406.4mm) when above when the sleeve pipe specification, is very easy to thread alternating takes place during button on the scene, oil field and causes serious thread gluing.Casing threads thread gluing meeting influences its quality of connection, and more serious thread gluing also can cause sleeve pipe to scrap.
The tapering of API round thread generally is 1: 16, and thread depth is 1.801mm, and pitch is per inch (25.4mm) 8 teeth, and its bearing surface angle and spigot surface angle all are 30 °.The spigot surface of this screw thread is milder, be beneficial to make-up and last button, but its pitch little (being so-called closely-pitched), easy thread alternating, the also easy thread alternating of tapering mild (1: 16), more obvious when especially specification is big, the API regulation reaches 16 inches (406.4mm) when above when specification for this reason, and the tapering increase is 1: 12.However, this thread forms still is easy to take place thread alternating and thread gluing.The joint efficiency of this screw thread is low simultaneously, can only reach 60～80% of body.
The tapering of API buttress thread is the same with round thread, generally is 1: 16, and when specification reached more than 16 inches, increase was 1: 12.This thread depth is 1.575mm, and pitch is per inch (25.4mm) 5 teeth, and the pitch increase helps button, but its screw thread spigot surface angle is 10 °, and is steeper than round thread, is unfavorable for button, and its bearing surface angle is 3 °, has improved the joint efficiency of screw thread.
Because thread gluing takes place common API screw thread easily, therefore had a strong impact on it and promoted the use of.Detain performance in order to improve going up of casing threads, prevent the screw thread thread gluing, a lot of researchers have carried out research work.The Chinese patent publication number is CN 1065018C, and open day is April 25 calendar year 2001, and the patent of invention name is called oil, casing thread connection, has provided a kind of joint form that can slow down or prevent the screw thread thread gluing.This patent is made up of body and pipe box cupling, and the reach on the body is L
4, the reach on the pipe box cupling is L
7, the tapering of screw thread on diametric(al) is 1: M, M generally get 16, and the tapering in the screw thread top certain-length of its middle tube body or pipe box cupling is 1: (M-q), q=0.1～4.5.Simultaneously, the tapering in the screw tip certain-length of body or pipe box cupling is set to 1: (M+q).This joint has slowed down the stress concentration degree at screw thread two ends owing to changed tapering at the screw thread two ends, makes screw thread be not easy to take place thread gluing.The Chinese patent publication number is CN 1182317C, and open day is on December 29th, 2004, and the patent of invention name is called oil, casing thread connection, has provided a kind of oil, casing thread connection of sticking-resistant.This patent of invention is linked together by round thread or buttress thread by body and pipe box cupling, the tapering that is threaded is 1: 16, characteristics are that external screw thread and API standard thread are identical, by changing the physical dimension of internal thread, promptly change the pitch at screw thread two ends, for buttress thread, the pitch of the 1st～2 or the 1st～3 circle screw thread is that P is little, the pitch of last 1～2 or 1～3 circle screw thread is that P is big, and remainder pitch is standard value P.Then pitch is changed for round thread by the way of reface.Can improve the stress distribution of joint like this, make joint be not easy to take place thread gluing.
But the limitation of above-mentioned patented technology is: design does not break away from the design philosophy of API screw thread, though improved the anti-stick button performance of joint, the shortcoming of the easy thread alternating of joint, difficult make-up is not improved, and the possibility of screw thread generation thread gluing is still very big.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, a kind of petroleum sleeve joint of sticking-resistant is provided.This joint thoroughly improves the anti-stick button performance of screw thread by increasing thread taper, strengthen thread pitch, increase screw thread spigot surface angle, making methods such as being parallel to tube axis at the bottom of screw thread tooth top, the tooth.
According to technical scheme provided by the invention, external thread piece 1,3 is connected with a joggle togather by screw thread and box cupling 2, it is characterized in that: the tapering of screw thread is 1: 6～1: 8, the pitch of screw thread is per inch 3 teeth, the height of screw thread is 2.05～2.45mm, is parallel to the axis of pipe at the bottom of the tooth top of screw thread, the tooth.
The spigot surface angle of screw thread is 25～30 °, and the bearing surface angle is 0 °.On box cupling 2, be processed with internal thread 4, on external thread piece 1,3, be processed with external screw thread 5.After joint was tightened, internal thread 4 meshed together with external screw thread 5, formed interference fit.
In general, the pitch of screw thread is big more, and ridge is thick more, on just be not easy thread alternating when detaining more.The pitch of API screw thread is per inch 8 teeth or 5 teeth, and this screw thread is when pipe diameter is big, and internal and external screw thread has deflection just to be easy to thread alternating slightly.The present invention is directed to this shortcoming, pitch is increased to per inch 3 teeth, make the easier make-up of joint.Equally, the tapering of screw thread also has certain influence to the last performance of buckleing, and tapering is big more usually, and easy more make-up, 1: 16 tapering are that the API screw thread generally adopts, but when pipe diameter is big (more than or equal to 16 inches), API then adopts 1: 12 tapering.The design adopts 1: 7 to 1: 8 tapering according to different calibers, makes the upward button performance of screw thread better.But tapering increases the bonding strength that can reduce screw thread.The shape of the design's double thread for this reason, especially bearing surface angle and thread depth are stipulated, the bearing surface angle of regulation screw thread is 0 ° (the API screw thread is 30 ° or 10 °), sleeve pipe is when being stretched like this, the radial component that axial load produces is zero, improved the joint efficiency of screw thread, simultaneously thread depth has been increased between 2.05～2.45mm, the bonding strength of screw thread is strengthened.
The spigot surface angle of screw thread is relevant with the upward button performance of joint, and the spigot surface angle is big more, the easy more button of going up, the spigot surface angle of API round thread is 30 °, and the spigot surface angle of buttress thread is 10 °, and thread forms of the present invention more approaches trapezoidal partially, select 25～30 ° at screw thread spigot surface angle, see accompanying drawing 2.Make the upward button performance of joint better like this.But the spigot surface angle increases the anti-compression properties that makes joint and descends, and considers that anti-compression properties is also relevant with tapering simultaneously, and the design's taper ratio is bigger, selects 25～30 ° at spigot surface angle still can make the anti-compression properties of joint satisfy the requirement of relevant criterion.
In order to strengthen the sticking-resistant performance of joint, another measure that the design takes is axis rather than the screw thread bus that is parallel to pipe at the bottom of the tooth top that makes screw thread, the tooth.Because button all is vertical on the oil field, box cupling is fixed on the slip spider of raised platform around a well, and pipe is vertically sling and made external screw thread centering, if the screw thread tooth top is parallel to the screw thread bus, then is unfavorable for make-up, is designed to the shoulder tooth pattern, has then improved the make-up performance of screw thread.
By above-mentioned measure, make the design's joint form have good sticking-resistant performance, switching performance does not descend simultaneously, still can satisfy instructions for use.The present invention is suitable for petroleum casing pipe and adopts, and is particularly suitable for the bigger sleeve pipe of diameter and adopts.
Compared with prior art, the present invention has marked improvement, is in particular in: 1) way by increasing thread pitch, thread taper and manufacturing the flat-top button, and that has improved screw thread recognizes the button performance, goes up button speed simultaneously and also increases; 2) by increasing the method at screw thread spigot surface angle, make the easy make-up of joint, be difficult for thread alternating; 3) change screw thread bearing surface angle into 0 °, avoided the joint slippage, improved the joint efficiency of joint.Therefore this joint has good sticking-resistant performance, and switching performance is good simultaneously.
Description of drawings
Fig. 1 is a structure chart of the present invention.
Fig. 2 is the thread forms schematic diagram.
Among the figure 6 is spigot surface, and 7 is bearing surface, and 8 is middle footpath.
The specific embodiment
First embodiment of the design is the sleeve pipe that is used for Φ 508.0 * 12.7 mm, and grade of steel is N80.The external diameter of external thread piece 1,3 is 508.0mm, wall thickness 12.7mm, and the external diameter of box cupling 2 is 533.4mm, length is not less than 270.0mm.Thread pitch is per inch 3 teeth, thread taper 1: 7.5, and thread depth 2.1 5mm, thread forms is for trapezoidal partially, 30 ° at its spigot surface angle, 0 ° at bearing surface angle, thread engagement length 123mm.This joint tensile strength 12700kN, incompressible intensity is detained on the joint moment of torsion according to the rules greater than tensile strength, at least can on unload 3 times and be not damaged.
Second embodiment of the design is the sleeve pipe that is used for Φ 406.4 * 12.57 mm, and grade of steel is P110.The external diameter of external thread piece 1,3 is 406.4mm, wall thickness 12.57mm, and the external diameter of box cupling 2 is 431.8mm, length is not less than 270.0mm.Thread pitch is per inch 3 teeth, thread taper 1: 8, and thread depth 2.15mm, thread forms is for trapezoidal partially, 25 ° at its spigot surface angle, 0 ° at bearing surface angle, thread engagement length 123mm.This joint tensile strength 11700kN, incompressible intensity is detained on the joint moment of torsion according to the rules greater than tensile strength, at least can on unload 3 times and be not damaged.
Claims (3)
1. the petroleum sleeve joint of a sticking-resistant, comprise external thread piece (1,3) and the box cupling (2) that meshes together by screw thread and external thread piece (1,3), it is characterized in that: the tapering of screw thread is 1: 6～1: 8, the pitch of screw thread is per inch 3 teeth, the height of screw thread is 2.05～2.45mm, is parallel to the axis of pipe at the bottom of the tooth top of screw thread, the tooth.
2. the petroleum sleeve joint of sticking-resistant according to claim 1, it is characterized in that: the spigot surface angle of screw thread is 25～30 °, the bearing surface angle is 0 °.
3. the petroleum sleeve joint of sticking-resistant according to claim 1, it is characterized in that: on box cupling (2), be processed with internal thread (4), on external thread piece (1,3), be processed with external screw thread (5), after joint is tightened, internal thread (4) meshes together with external screw thread (5), forms interference fit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101347048A CN101144372A (en) | 2007-10-15 | 2007-10-15 | Sticking-resistant petroleum sleeve joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101347048A CN101144372A (en) | 2007-10-15 | 2007-10-15 | Sticking-resistant petroleum sleeve joint |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101144372A true CN101144372A (en) | 2008-03-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007101347048A Pending CN101144372A (en) | 2007-10-15 | 2007-10-15 | Sticking-resistant petroleum sleeve joint |
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| CN (1) | CN101144372A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101871327A (en) * | 2010-07-09 | 2010-10-27 | 天津钢管集团股份有限公司 | Variable conicity API (American Petroleum Institute) thread oil sleeve joint |
| CN101898265A (en) * | 2010-08-16 | 2010-12-01 | 天津钢管集团股份有限公司 | Method for processing and measuring pitch diameter changing thread |
| CN102191919A (en) * | 2010-03-18 | 2011-09-21 | 张晓义 | Thermal compensation oil casing joint |
| CN102996079A (en) * | 2011-09-16 | 2013-03-27 | 中国石油化工股份有限公司 | Tubular air sealing screwed joint and application thereof |
| CN105298411A (en) * | 2015-11-18 | 2016-02-03 | 中国石油集团渤海石油装备制造有限公司 | Sleeve joint structure |
| CN109653687A (en) * | 2018-12-24 | 2019-04-19 | 山东祺龙海洋石油钢管股份有限公司 | A kind of surface conductor pipe special thread tooth form |
| CN115431000A (en) * | 2022-09-28 | 2022-12-06 | 包头钢铁（集团）有限责任公司 | Processing and manufacturing method of rare earth steel special threaded coupling |
-
2007
- 2007-10-15 CN CNA2007101347048A patent/CN101144372A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102191919A (en) * | 2010-03-18 | 2011-09-21 | 张晓义 | Thermal compensation oil casing joint |
| CN101871327A (en) * | 2010-07-09 | 2010-10-27 | 天津钢管集团股份有限公司 | Variable conicity API (American Petroleum Institute) thread oil sleeve joint |
| CN101898265A (en) * | 2010-08-16 | 2010-12-01 | 天津钢管集团股份有限公司 | Method for processing and measuring pitch diameter changing thread |
| CN102996079A (en) * | 2011-09-16 | 2013-03-27 | 中国石油化工股份有限公司 | Tubular air sealing screwed joint and application thereof |
| CN105298411A (en) * | 2015-11-18 | 2016-02-03 | 中国石油集团渤海石油装备制造有限公司 | Sleeve joint structure |
| CN109653687A (en) * | 2018-12-24 | 2019-04-19 | 山东祺龙海洋石油钢管股份有限公司 | A kind of surface conductor pipe special thread tooth form |
| CN115431000A (en) * | 2022-09-28 | 2022-12-06 | 包头钢铁（集团）有限责任公司 | Processing and manufacturing method of rare earth steel special threaded coupling |
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| C06 | Publication | ||
| PB01 | Publication | ||
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
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Open date: 20080319 |