CN203463035U - Screwed joint for petroleum casing pipe - Google Patents
Screwed joint for petroleum casing pipe Download PDFInfo
- Publication number
- CN203463035U CN203463035U CN201320402218.0U CN201320402218U CN203463035U CN 203463035 U CN203463035 U CN 203463035U CN 201320402218 U CN201320402218 U CN 201320402218U CN 203463035 U CN203463035 U CN 203463035U
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- CN
- China
- Prior art keywords
- box cupling
- thread
- screw thread
- pipe body
- sealing surface
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- 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 - Lifetime
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- 239000003208 petroleum Substances 0.000 title abstract description 5
- 238000007789 sealing Methods 0.000 claims abstract description 31
- 230000007704 transition Effects 0.000 claims abstract description 10
- 230000008878 coupling Effects 0.000 claims abstract description 8
- 238000010168 coupling process Methods 0.000 claims abstract description 8
- 238000005859 coupling reaction Methods 0.000 claims abstract description 8
- 230000015572 biosynthetic process Effects 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 abstract description 6
- 239000002184 metal Substances 0.000 abstract description 6
- 238000005260 corrosion Methods 0.000 abstract description 3
- 230000007797 corrosion Effects 0.000 abstract description 3
- 230000035945 sensitivity Effects 0.000 abstract description 2
- 238000013461 design Methods 0.000 description 5
- 238000011161 development Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000005476 soldering Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000003129 oil well Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 241001474791 Proboscis Species 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 210000002445 nipple Anatomy 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Landscapes
- Non-Disconnectible Joints And Screw-Threaded Joints (AREA)
Abstract
The utility model discloses a screwed joint for a petroleum casing pipe. The screwed joint is formed by a pipe body and a coupling. The coupling is respectively equipped with a torque shoulder, a conical sealing surface segment, a conical transition segment and an internal screw thread from the center to end portions in an axial direction. The pipe body is respectively provided with an external screw thread, a pipe body outer cylindrical segment, a spherical sealing surface and a torque shoulder from the center to the transverse plane of the pipe body in an axial direction. The coupling of the screwed joint is additionally equipped with an inner conical surface sealing surface, the pipe body is additionally provided with a spherical sealing surface and a cylindrical segment, and then the pipe body and the coupling are screwed and buckled together to form a triple metal interference fit, such that the sealing performance of the joint is substantially improved. Meanwhile, through reduction of screw thread interference and reduction of annular stress of the screwed joint, screw thread stress corrosion sensitivity is reduced and screw thread sticking buckle resistance is increased. A place of combination between the internal diameter of the torque shoulder of the coupling and the internal diameter of the end portions of the pipe body is designed to be a smooth transition, such that turbulent flow of oil and gas inside a pipe can be eliminated and the resistant to corrosion of the joint is enhanced.
Description
Technical field
The utility model relates to petroleum industry oil well pipe link technique field, is specifically related to a kind of oil casing threaded connection, especially a kind of SEW cover pipe screw joint with good gas sealing ability.
Background technology
At present on market, oil field, the oil well pipe of extensive use mainly contains two kinds of seamless tubing and casing and soldering oil sleeve pipes, and soldering oil sleeve pipe is compared and had the advantages such as dimensional accuracy is high, wall thickness is even, anti-extrusion performance is good, cost is low with seamless tubing and casing.In developed country, soldering oil sleeve pipe has replaced quite a few seamless tubing and casing, and consumption accounts for the more than 50% of the total consumption of tubing and casing.SEW (hot stretch-reducingelectricwelding hot tensile strength tube reducing electric resistance welding) tubing and casing belongs to a kind of of soldering oil sleeve pipe.Along with the development of China's steel smelting technique and tube-making technology, the SEW tubing and casing at home application percentage in oil field increases gradually, has good economic benefit.
In development of oil industry process, along with the future development of casinghead gas drilling operation to working conditions such as deep-well, ultradeep wells, according to the joint of API standard manufacture and existing part Special threading connector due to the sealing performance under high temperature, high pressure and Axial Loads lost efficacy and high moment of torsion under the reasons such as thread gluing problem be difficult to meet the development requires in oil field.
Utility model content
The utility model provides a kind of oil casing threaded connection, has solved in the thread gluing problem that high temperature, high pressure and Axial Loads lower seal performance lost efficacy and high torsional interaction causes, and improves the security reliability of nipple in operation.
In order to solve the problems of the technologies described above, the technical scheme that the utility model Special screwed joint of petroleum sleeve pipe is achieved is:
An oil casing threaded connection, consists of body and box cupling, described box cupling vertically therefrom mind-set end be respectively arranged with torque shoulder, conical seal surface section, cone transitional section and internal thread; Described body vertically therefrom mind-set body end face be respectively arranged with external screw thread, body cylindrical shell of column, spherical seal surface and torque shoulder.
The thread taper of described body and box cupling is 1:16, and pitch is 5.08mm, and described form of thread bearing surface angle is-5--3 °, and described form of thread spigot surface angle is 10-25 °.
The height of thread of described box cupling is 1.875mm; The height of thread of described body is 1.575mm; At box cupling and body, screw after button, at the bottom of coupling inner thread tooth and between external screw thread crest, have gap.
The sealing surface of described box cupling is the conical surface; The sealing surface of described body is sphere, and its radius is 130mm-290mm; The seal section of the conical surface and the seal section of sphere coordinate formation sealing surface.
On described box cupling and body, between each linkage section, be provided with transition arc or sphere.
The utility model Special screwed joint of petroleum sleeve pipe consists of body and box cupling, and the thread taper of described sleeve pipe and box cupling is 1:16, and pitch is 5.08mm, and described form of thread bearing surface angle is-5--3 °, and described form of thread spigot surface angle is 10-25 °; Described box cupling height of thread is 1.875mm; Described body height of thread is 1.575mm; At box cupling and body, screw after button, at the bottom of coupling inner thread tooth and between external screw thread crest, have certain interval, reduced the magnitude of interference belt stress of screw thread, improve the anti-stick button ability of screw thread simultaneously.
Adopt 15 ° of negative angle torque shoulder, guarantee the accuracy of position on the buckle, effectively prevented from crossing the generation of turning round, reduce the concentrated effect of shoulder place stress; Negative angle shoulder and negative angle screw thread bearing surface form wedge shape self-locking effect simultaneously, are not easy to pull;
Described box cupling seal section is the conical surface; Described body sealing surface is the sphere of radius (130mm-290mm); Conical surface seal face and spherical seal surface coordinate the formation conical surface-sphere metal interference seal form; Described box cupling conical surface seal face and body spherical seal surface length are 6-10mm, revolve and upper button forms the sealing of the longer metal interference of length afterwards, make joint sealing face place stress distribution reasonable, and still can keep in touch under high temperature, high pressure and Axial Loads, thereby realize positiver sealing;
On box cupling shown in described and body, between each linkage section, be provided with transition arc or sphere;
Above-mentioned body, screw button with box cupling after, forms triple seal, is respectively between internal and external threads, the sealing of the interference fit formation between outer spherical sealing surface section and female cone sealing surface section, between body torque shoulder and box cupling torque shoulder.
The SEW that the utility model provides overlaps effective hermetic seal jointing, comprises a box cupling and two bodys, and this joint has following architectural feature:
Internal thread on described box cupling is divided into symmetrical two ends, between internal thread ending place and interior column sealed section, is provided with changeover portion; The external screw thread front end of described body is provided with proboscis end, and spherical seal surface section has been designed in nose front portion, is provided with a cylindrical shell of column between spherical seal surface section and external screw thread; Body spherical seal surface section forms metal interference with box cupling female cone sealing surface section and coordinates; Body torque shoulder forms metal interference with box cupling torque shoulder and coordinates.
Compared with prior art, this joint design has marked improvement, is in particular in the following aspects:
1, the anti-mistake that the design of 15 ° of negative angle torque shoulder has not only improved joint turn round ability and on anchor the accuracy of position, and increased the sealing performance of joint.
2, the torque shoulder of 15 ° of negative angles and screw thread negative angle bearing surface dihedral wedgewise self-locking structure, be difficult for threading off, and under tensile load effect, can effectively alleviate moving axially between box cupling and body, thereby guarantee the reliability of sealing.
3, sphere has solved to twist to the metal interference design of Sealing Structure of the conical surface and has connect the wayward sealing surface magnitude of interference fluctuation problem causing in position, has guaranteed that the basic maintenance in design seal length of the sealing surface magnitude of interference is average.Coordinate torque shoulder to form auxiliary seal to top, significantly improved the sealing reliability of joint.
4, reduce the magnitude of interference of screw thread, reduced the circumference stress of screw thread, reduced the Sensitivity of Stress Corrosion of joint, improved the anti-stick button ability of screw thread.
Accompanying drawing explanation
Fig. 1 is the utility model structural representation;
Fig. 2 is box cupling structural representation;
Fig. 3 is the local enlarged diagram of box cupling;
Fig. 4 is pipe structure schematic diagram;
Fig. 5 is the local enlarged diagram of body;
Accompanying drawing is described as follows:
1-box cupling, 2-body, 3-internal thread, 4-cone transitional section, 5-conical seal surface section, 6-box cupling torque shoulder, 7-external screw thread, 8-body cylindrical shell of column, 9-body spherical seal surface section, 10-body torque shoulder, the 11-body section of seamlessly transitting.
The specific embodiment
Below in conjunction with accompanying drawing, the utility model is elaborated.
Referring to Fig. 1, prior art comprises a box cupling and two bodys, is provided with internal thread on box cupling, is provided with external screw thread on body.
Referring to Fig. 2-Fig. 5, a kind of oil casing threaded connection, comprises box cupling and body.Described box cupling vertically therefrom mind-set end face be respectively arranged with box cupling torque shoulder 6, female cone sealing surface section 5, the transition circle conical surface 4 and internal thread 3, body vertically therefrom mind-set pipe end be disposed with external screw thread 7, body cylindrical shell of column 8, body outer spherical sealing surface section 9, body torque shoulder 10 and body transitions smooth section 11.The transition circle conical surface 4 on described box cupling is 40-60 ° with box cupling axis angle.Described body transitions smooth section 11 is 3-8 ° with body axis angle.On box cupling and body, each junction is provided with transition arc or sphere.
In the utility model patent, box cupling and body screw after button, and internal thread 3 forms triple-heavy metal interference fit, i.e. triple seal with body outer spherical sealing surface section 9, box cupling torque shoulder 6 with body torque shoulder 10 with external screw thread 7, female cone sealing surface section 5.
According to the utility model design scheme, provide a kind of product of concrete specification as follows:
Product specification is
grade of steel is N80.Body and box cupling external diameter, wall thickness dimension are with reference to API5CT standard-required.Thread taper is 1:16,5 pitch threads in every 25.4mm length, and the screw thread magnitude of interference is selected 0.1-0.25mm, and the primary seal magnitude of interference is selected 0.15-0.38mm.
The above, it is only preferred embodiment of the present invention, not the present invention is done to any pro forma restriction, although the present invention discloses as above with preferred embodiment, yet not in order to limit the present invention, any those skilled in the art, do not departing within the scope of technical solution of the present invention, when can utilizing the method for above-mentioned announcement and technology contents to make a little change or being modified to the equivalent embodiment of equivalent variations, in every case be the content that does not depart from technical solution of the present invention, any simple modification of above embodiment being done according to technical spirit of the present invention, equivalent variations and modification, still belong in the scope of technical solution of the present invention.
Claims (5)
1. an oil casing threaded connection, consists of body and box cupling, it is characterized in that: described box cupling vertically therefrom mind-set end be respectively arranged with torque shoulder, conical seal surface section, cone transitional section and internal thread; Described body vertically therefrom mind-set body end face be respectively arranged with external screw thread, body cylindrical shell of column, spherical seal surface and torque shoulder.
2. oil casing threaded connection according to claim 1, is characterized in that: the thread taper of described body and box cupling is 1:16, and pitch is 5.08mm, and described form of thread bearing surface angle is-5--3 °, and described form of thread spigot surface angle is 10-25 °.
3. oil casing threaded connection according to claim 2, is characterized in that: the height of thread of described box cupling is 1.875mm; The height of thread of described body is 1.575mm; At box cupling and body, screw after button, at the bottom of coupling inner thread tooth and between external screw thread crest, have gap.
4. oil casing threaded connection according to claim 1, is characterized in that: the sealing surface of described box cupling is the conical surface; The sealing surface of described body is sphere, and its radius is 130mm-290mm; The seal section of the conical surface and the seal section of sphere coordinate formation sealing surface.
5. oil casing threaded connection according to claim 1, is characterized in that: on described box cupling and body, between each linkage section, be provided with transition arc or sphere.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320402218.0U CN203463035U (en) | 2013-07-05 | 2013-07-05 | Screwed joint for petroleum casing pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320402218.0U CN203463035U (en) | 2013-07-05 | 2013-07-05 | Screwed joint for petroleum casing pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203463035U true CN203463035U (en) | 2014-03-05 |
Family
ID=50175407
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320402218.0U Expired - Lifetime CN203463035U (en) | 2013-07-05 | 2013-07-05 | Screwed joint for petroleum casing pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203463035U (en) |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104613256A (en) * | 2015-02-12 | 2015-05-13 | 唐山冀东石油机械有限责任公司 | High-pressure water injection pipeline for oil fields |
| CN104895508A (en) * | 2015-06-29 | 2015-09-09 | 东营市永利精工石油机械制造有限公司 | Special threaded connector for HTHP oil-gas well |
| CN104929533A (en) * | 2015-05-29 | 2015-09-23 | 聊城安泰石油机械有限公司 | Hermetic connector for ATPM-II oil tube and casing, tube block and coupling |
| CN108518184A (en) * | 2018-03-26 | 2018-09-11 | 天津商业大学 | A kind of new Joining Structure of oil well pipe and box cupling |
| CN108716369A (en) * | 2018-06-28 | 2018-10-30 | 无锡西姆莱斯石油专用管制造有限公司 | A kind of casing thread connection of multi-sealed hook-type screw thread |
| CN109403877A (en) * | 2018-11-26 | 2019-03-01 | 中国石油大学(北京) | Oil pipe thread connector |
| CN109488223A (en) * | 2018-12-23 | 2019-03-19 | 扬州龙川钢管有限公司 | A kind of novel seal button oil annular tube structure |
| CN110847841A (en) * | 2019-10-11 | 2020-02-28 | 中国石油天然气股份有限公司 | Annular steel plate device |
| CN111872385A (en) * | 2020-06-30 | 2020-11-03 | 中国石油天然气集团有限公司 | Local additive manufacturing method for threaded joint of bimetal composite oil well pipe |
| CN112555527A (en) * | 2020-12-23 | 2021-03-26 | 中国石油天然气集团有限公司 | Non-metal flexible composite pipe buckling and pressing joint for oil and gas transmission and connecting method thereof |
| CN113445936A (en) * | 2021-07-21 | 2021-09-28 | 辽宁新华仪器有限公司 | Novel anti-rotation coupling |
| CN114809943A (en) * | 2022-05-30 | 2022-07-29 | 淄博孚瑞特热能科技有限公司 | A kind of oil casing threaded joint with stress reducing effect |
-
2013
- 2013-07-05 CN CN201320402218.0U patent/CN203463035U/en not_active Expired - Lifetime
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104613256A (en) * | 2015-02-12 | 2015-05-13 | 唐山冀东石油机械有限责任公司 | High-pressure water injection pipeline for oil fields |
| CN104929533A (en) * | 2015-05-29 | 2015-09-23 | 聊城安泰石油机械有限公司 | Hermetic connector for ATPM-II oil tube and casing, tube block and coupling |
| CN104895508A (en) * | 2015-06-29 | 2015-09-09 | 东营市永利精工石油机械制造有限公司 | Special threaded connector for HTHP oil-gas well |
| CN104895508B (en) * | 2015-06-29 | 2017-05-31 | 东营市永利精工石油机械制造有限公司 | HTHP Oil/gas Well Special threading connectors |
| CN108518184A (en) * | 2018-03-26 | 2018-09-11 | 天津商业大学 | A kind of new Joining Structure of oil well pipe and box cupling |
| CN108716369A (en) * | 2018-06-28 | 2018-10-30 | 无锡西姆莱斯石油专用管制造有限公司 | A kind of casing thread connection of multi-sealed hook-type screw thread |
| CN109403877A (en) * | 2018-11-26 | 2019-03-01 | 中国石油大学(北京) | Oil pipe thread connector |
| CN109488223B (en) * | 2018-12-23 | 2024-05-28 | 扬州龙川能源装备有限公司 | Novel sealing oil-buckling sleeve structure |
| CN109488223A (en) * | 2018-12-23 | 2019-03-19 | 扬州龙川钢管有限公司 | A kind of novel seal button oil annular tube structure |
| CN110847841A (en) * | 2019-10-11 | 2020-02-28 | 中国石油天然气股份有限公司 | Annular steel plate device |
| CN111872385B (en) * | 2020-06-30 | 2022-06-03 | 中国石油天然气集团有限公司 | Local additive manufacturing method for threaded joint of bimetal composite oil well pipe |
| CN111872385A (en) * | 2020-06-30 | 2020-11-03 | 中国石油天然气集团有限公司 | Local additive manufacturing method for threaded joint of bimetal composite oil well pipe |
| CN112555527A (en) * | 2020-12-23 | 2021-03-26 | 中国石油天然气集团有限公司 | Non-metal flexible composite pipe buckling and pressing joint for oil and gas transmission and connecting method thereof |
| CN113445936A (en) * | 2021-07-21 | 2021-09-28 | 辽宁新华仪器有限公司 | Novel anti-rotation coupling |
| CN113445936B (en) * | 2021-07-21 | 2025-04-15 | 辽宁新华仪器有限公司 | Anti-rotation coupling |
| CN114809943A (en) * | 2022-05-30 | 2022-07-29 | 淄博孚瑞特热能科技有限公司 | A kind of oil casing threaded joint with stress reducing effect |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20170601 Address after: 100007 Beijing, Dongzhimen, North Street, No. 9, No. Co-patentee after: BAOJI PETROLEUM STEEL PIPE Co.,Ltd. Patentee after: China National Petroleum Corp. Address before: 721008 Weibin, Shaanxi province Jiang Tan Road, No. 10, No. Patentee before: BAOJI PETROLEUM STEEL PIPE Co.,Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140305 |