CN109488223B - Novel sealing oil-buckling sleeve structure - Google Patents
Novel sealing oil-buckling sleeve structure Download PDFInfo
- Publication number
- CN109488223B CN109488223B CN201811577064.2A CN201811577064A CN109488223B CN 109488223 B CN109488223 B CN 109488223B CN 201811577064 A CN201811577064 A CN 201811577064A CN 109488223 B CN109488223 B CN 109488223B
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- oil
- coupling
- sealing surface
- pipe body
- conical
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- 238000007789 sealing Methods 0.000 title claims abstract description 99
- 238000010168 coupling process Methods 0.000 claims abstract description 77
- 238000005859 coupling reaction Methods 0.000 claims abstract description 77
- 230000008878 coupling Effects 0.000 claims abstract description 73
- 238000003780 insertion Methods 0.000 claims abstract description 3
- 230000037431 insertion Effects 0.000 claims abstract description 3
- 230000000694 effects Effects 0.000 abstract description 4
- 230000006835 compression Effects 0.000 abstract description 2
- 238000007906 compression Methods 0.000 abstract description 2
- 239000002184 metal Substances 0.000 description 6
- 238000005553 drilling Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 101150082516 HDT1 gene Proteins 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/08—Casing joints
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Non-Disconnectible Joints And Screw-Threaded Joints (AREA)
Abstract
The invention relates to a novel sealing oil buckling sleeve structure. The oil casing comprises an oil casing body and an oil casing coupling; one end of the oil sleeve body is provided with a pipe external thread, the front end of the pipe external thread is provided with a pipe body cylindrical sealing surface, the front end of the pipe body cylindrical sealing surface is provided with a pipe body conical surface sealing surface, and the front end of the pipe body conical surface sealing surface is provided with a pipe body end torque shoulder; the oil pipe coupling is provided with a connecting hole for the insertion of an oil pipe body of the oil pipe, and the connecting hole is internally provided with a coupling internal thread, a coupling spherical sealing surface, a coupling conical surface sealing surface and a coupling torque shoulder from outside to inside in sequence, the oil pipe coupling is internally provided with a step hole, and the coupling torque shoulder is arranged at the corner of the joint of the two step holes. According to the invention, the conical surface sealing surface of the pipe body is in interference fit with the conical surface sealing surface of the oil casing coupling, so that the tightness of the oil casing is greatly enhanced; the torque shoulder on the oil sleeve pipe body end is matched with the torque shoulder on the oil sleeve pipe joint end, so that the compression resistance and the reactive torque effect of the oil sleeve pipe joint are improved.
Description
Technical Field
The invention belongs to the technical field of petroleum exploitation drilling equipment, relates to an oil sleeve threaded connection technology of the drilling equipment, and particularly relates to a novel metal sealing special oil buckling sleeve structure of hook-shaped buttress threads.
Background
With the continuous improvement of petroleum exploration technology, high-temperature wells, high-pressure wells and deep wells are developed in large quantities, the service environment of underground tubular columns is continuously deteriorated, and higher requirements are provided for the connection performance, the sealing performance and the anti-buckling performance of the oil casing coupling. The existing coupling used in the oil and gas field can be divided into an API threaded coupling and a special threaded coupling. The API thread coupling realizes sealing through interference fit between threads and thread grease plugging, and the special thread coupling realizes multistage sealing through independent sealing surfaces and torque shoulders, so that the special thread coupling has higher connection strength and better air tightness than the API coupling. Research and practice show that the connection and sealing performance of the common API threaded coupling cannot meet the requirements of high-temperature high-pressure deep wells, and special threaded couplings are recommended to be used for oil and gas wells with higher pressure.
Disclosure of Invention
Aiming at the technical defects existing in the prior art, the invention optimizes the API buttress thread, increases the metal seal, adopts three-dimensional modeling software to construct a parameterized geometric model of the oil casing thread coupling sealing structure, and provides a novel metal seal special oil-buckling casing structure.
In order to achieve the purpose of the invention, the technical scheme adopted by the invention is as follows: the novel sealing oil buckling sleeve structure comprises an oil sleeve pipe body (1) and an oil sleeve pipe joint (5) connected with the oil sleeve pipe body (1);
One end of the oil sleeve body (1) is provided with a body external thread (2), the front end of the Guan Tiwai thread (2) is provided with a body cylindrical sealing surface (9), the front end of the body cylindrical sealing surface (9) is provided with a body conical surface sealing surface (3), and the joint of the front end of the body conical surface sealing surface (3) and the end surface of the oil sleeve body (1) is provided with a body end torque shoulder (4);
The oil casing pipe joint (5) is provided with a connecting hole for the insertion of the oil casing pipe body (1), a coupling internal thread (6), a coupling spherical sealing surface (10), a coupling conical surface sealing surface (7) and a coupling torque shoulder (8) are sequentially arranged in the connecting hole from outside to inside, a step hole is arranged in the oil casing pipe joint (5), and the coupling torque shoulder (8) is arranged at the corner of the joint of the two step holes;
The pipe body external screw thread (2) and the coupling internal screw thread (6) are correspondingly arranged, the pipe body cylindrical sealing surface (9) and the coupling spherical sealing surface (10) are correspondingly arranged, the pipe body conical surface sealing surface (3) and the coupling conical surface sealing surface (7) are correspondingly arranged, and the pipe body end torque shoulder (4) and the coupling torque shoulder (8) are correspondingly arranged.
The conical surface sealing surface (3) of the pipe body and the conical surface sealing surface (7) of the coupling conical surface of the oil sleeve pipe joint (5) are in conical surface interference fit, and the angle alpha between the conical surface and the horizontal plane is 28-33 degrees.
The cylindrical sealing surface (9) of the pipe body is in spherical-to-cylindrical interference fit with the spherical sealing surface (10) of the coupling of the oil sleeve pipe joint (5).
The torque shoulder (4) at the pipe body end is in interference fit with the coupling torque shoulder (8) of the oil sleeve coupling (5) by adopting a shoulder surface, the angle beta of the shoulder surface and the vertical surface of the oil sleeve pipe body (1) is 13-17 degrees, and the oil sleeve coupling (5) is 13-17 degrees.
The external thread (2) and the internal thread (6) of the coupling are novel buttress conical threads, the thread pitch P of the novel buttress conical threads is set to be 8 threads/in or 3-1/2-4-1/2 of the oil casing body (1) and 5-13-3/8 of the oil casing coupling (5), and the thread crests are parallel to conical buses.
The bearing surface angle of the novel buttress conical thread is set to be-3-0 degrees with the clockwise angle of the vertical surface, and the guiding surface angle is set to be 10-13 degrees.
The diameter tolerance of a main sealing surface formed by the conical surface sealing surface (3) of the pipe body and the conical surface sealing surface (7) of the coupling conical surface of the oil sleeve pipe joint (5) is +/-0.05 mm, the length of the main sealing surface is more than or equal to 0.5mm, and the interference of the main sealing surface is 0.3mm.
The cylindrical sealing surface (9) of the pipe body and the spherical sealing surface (10) of the oil sleeve pipe joint are in spherical-to-cylindrical interference fit, and the interference is 0.10mm.
The interference of the pitch diameter of the thread is 0.1mm, and the distance difference between the pipe body and the coupling from the pitch diameter measuring point of the thread to the shoulder is less than or equal to 0.05mm.
The invention has the advantages that: with the engagement of the internal thread and the external thread, the conical surface sealing surface of the pipe body is in interference fit with the conical surface sealing surface of the oil casing coupling, so that the tightness of the oil casing is greatly enhanced, and the sealing effect is improved; the torque shoulder on the oil sleeve pipe body end is matched with the torque shoulder on the oil sleeve pipe joint end, so that the anti-torque effect can be well achieved when external force applies torque, the compression resistance and the anti-torque effect of the oil sleeve pipe joint are improved, and the connection capability is enhanced.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a schematic view of the structure of the outer threaded end of the pipe body of the present invention.
Fig. 3 is a schematic view of the structure of the threaded end in the pipe body of the present invention.
Fig. 4 is an enlarged schematic view of the thread structure of the present invention.
In the figure, a 1-oil casing pipe body, a 2-pipe external thread, a 3-pipe body conical surface sealing surface, a 4-pipe body end torque shoulder, a 5-oil casing coupling, a 6-coupling internal thread, a 7-coupling conical surface sealing surface, an 8-coupling torque shoulder, a 9-pipe body cylindrical sealing surface, a 10-coupling spherical sealing surface, an alpha-main sealing surface conical surface and a horizontal plane included angle, a beta-shoulder surface and a vertical plane included angle, an L-bearing surface angle, an S-guide surface angle and a P-pitch.
Detailed Description
The invention will be further described in order to better understand the invention:
the novel metal seal special buckling oil pipe structure comprises an oil sleeve pipe body 1 and an oil sleeve pipe joint 5, wherein one end of the oil sleeve pipe body 1 is a threaded end in the pipe body, and the other end of the oil sleeve pipe body is a threaded end outside the pipe body and is sequentially provided with a threaded end outside the pipe body 2, a cylindrical sealing surface 9 of the pipe body, a conical sealing surface 3 of the pipe body and a torque shoulder 4 of the pipe body end; one end of the oil casing coupling 5 is a coupling external thread end, the other end is a coupling internal thread end, and the coupling internal thread 6, a coupling spherical sealing surface 10, a coupling conical surface sealing surface 7 and a coupling torque shoulder 8 are sequentially arranged; the body end torque shoulder 4 on the end of the oil casing body 1 mates with the coupling torque shoulder 8 on the end of the oil casing coupling 5.
Wherein, the conical surface sealing surface 3 of the pipe body and the conical surface sealing surface 7 of the coupling of the oil casing 5 are in conical surface interference fit, and the angle alpha between the conical surface and the horizontal plane is 28-33 degrees.
Wherein, the cylindrical sealing surface 9 of the pipe body and the spherical sealing surface 10 of the coupling of the oil sleeve joint 5 are in spherical-to-cylindrical interference fit.
The torque shoulder 4 at the pipe body end is in interference fit with the coupling torque shoulder 8 of the pipe joint 5 of the oil sleeve by adopting a shoulder surface, and the angle beta between the shoulder surface and a vertical surface is 13-17 degrees of the HDT1 oil pipe and 13-17 degrees of the HDC1 sleeve.
Wherein, the bearing surface angle of the novel buttress conical thread is set to be-3-0 degrees with the clockwise angle of the vertical surface, and the guiding surface angle is set to be 10-13 degrees.
The oil casing thread coupling sealing structure comprises a main sealing structure, an auxiliary sealing structure and a thread seal, wherein the main sealing structure consists of a metal/metal radial sealing structure, the auxiliary sealing structure is a torque shoulder, the thread seal is a buttress thread radial interference seal, and structural parameters comprise a main sealing surface diameter, a main sealing surface length, a main sealing surface taper, a main sealing surface interference, a shoulder surface angle, a shoulder surface length, a shoulder surface interference, a sealing structure position, an arc radius, a thread pitch diameter interference and a distance from a thread pitch diameter measuring point to the shoulder.
Wherein, the diameter tolerance of the main sealing surface is +/-0.05 mm, the length of the main sealing surface is more than or equal to 0.5mm, and the interference between the pipe body and the main sealing surface of the coupling is 0.3mm.
Wherein, the diameter tolerance of the secondary main sealing cylinder is +/-0.05 mm, and the interference of the sphere to the cylinder is 0.10mm.
Wherein, the interference of the pitch diameter of the thread is 0.1mm, and the distance difference between the pipe body and the coupling from the measuring point of the pitch diameter of the thread to the shoulder is less than or equal to 0.05mm.
It should be noted that, in the present application, terms like "connected" and "connected" are used to denote "connected," and include both a direct connection of a certain component to another component and a connection of a certain component to another component through another component.
Claims (6)
1. The novel sealing oil buckling sleeve structure is characterized by comprising an oil sleeve pipe body (1) and an oil sleeve pipe joint (5) connected with the oil sleeve pipe body (1);
One end of the oil sleeve body (1) is provided with a body external thread (2), the front end of the Guan Tiwai thread (2) is provided with a body cylindrical sealing surface (9), the front end of the body cylindrical sealing surface (9) is provided with a body conical surface sealing surface (3), and the joint of the front end of the body conical surface sealing surface (3) and the end surface of the oil sleeve body (1) is provided with a body end torque shoulder (4);
The oil casing pipe joint (5) is provided with a connecting hole for the insertion of the oil casing pipe body (1), a coupling internal thread (6), a coupling spherical sealing surface (10), a coupling conical surface sealing surface (7) and a coupling torque shoulder (8) are sequentially arranged in the connecting hole from outside to inside, a step hole is arranged in the oil casing pipe joint (5), and the coupling torque shoulder (8) is arranged at the corner of the joint of the two step holes;
the pipe body external threads (2) and the coupling internal threads (6) are correspondingly arranged, the pipe body cylindrical sealing surface (9) and the coupling spherical sealing surface (10) are correspondingly arranged, the pipe body conical surface sealing surface (3) and the coupling conical surface sealing surface (7) are correspondingly arranged, and the pipe body end torque shoulder (4) and the coupling torque shoulder (8) are correspondingly arranged;
the conical surface sealing surface (3) of the pipe body and the conical surface sealing surface (7) of the coupling conical surface of the oil sleeve pipe joint (5) are in conical surface interference fit, and the angle alpha between the conical surface and the horizontal plane is 28-33 degrees;
the cylindrical sealing surface (9) of the pipe body is in spherical-to-cylindrical interference fit with the spherical sealing surface (10) of the coupling of the oil sleeve pipe joint (5);
The torque shoulder (4) at the pipe body end is in interference fit with the coupling torque shoulder (8) of the oil sleeve coupling (5) by adopting a shoulder surface, the angle beta of the shoulder surface and the vertical surface of the oil sleeve pipe body (1) is 13-17 degrees, and the oil sleeve coupling (5) is 13-17 degrees.
2. The novel sealing oil-buckled sleeve structure according to claim 1, wherein the external threads (2) of the sleeve body and the internal threads (6) of the coupling are novel buttress conical threads, the pitch P of the novel buttress conical threads is set to be 8 teeth/in or 3-1/2-4-1/2 of the oil sleeve body (1) and 5-13-3/8 of the oil sleeve coupling (5), and the thread crests are parallel to conical buses.
3. The novel sealing and oil-fastening sleeve structure according to claim 2, wherein the bearing surface angle of the novel buttress conical thread is set to be-3-0 degrees clockwise with a vertical surface, and the guide surface angle is set to be between 10-13 degrees.
4. The novel sealing oil-buckled sleeve structure according to claim 1, wherein a diameter tolerance of a main sealing surface formed by the conical sealing surface (3) of the pipe body and the conical sealing surface (7) of the coupling conical sealing surface (5) of the oil sleeve pipe is +/-0.05 mm, the length of the main sealing surface is more than or equal to 0.5mm, and the interference of the main sealing surface is 0.3mm.
5. The novel sealing oil-buckling sleeve structure according to claim 1, wherein the cylindrical sealing surface (9) of the pipe body and the spherical sealing surface (10) of the oil sleeve pipe joint are in spherical-to-cylindrical interference fit, and the interference is 0.10mm.
6. The novel sealing oil-retaining sleeve structure according to claim 3, wherein the interference of the pitch diameter of the thread is 0.1mm, and the distance difference between the pipe body and the coupling from the measuring point of the pitch diameter of the thread to the shoulder is less than or equal to 0.05mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811577064.2A CN109488223B (en) | 2018-12-23 | 2018-12-23 | Novel sealing oil-buckling sleeve structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811577064.2A CN109488223B (en) | 2018-12-23 | 2018-12-23 | Novel sealing oil-buckling sleeve structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109488223A CN109488223A (en) | 2019-03-19 |
| CN109488223B true CN109488223B (en) | 2024-05-28 |
Family
ID=65711391
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811577064.2A Active CN109488223B (en) | 2018-12-23 | 2018-12-23 | Novel sealing oil-buckling sleeve structure |
Country Status (1)
| Country | Link |
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| CN (1) | CN109488223B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203463035U (en) * | 2013-07-05 | 2014-03-05 | 宝鸡石油钢管有限责任公司 | Screwed joint for petroleum casing pipe |
| CN204139992U (en) * | 2014-07-16 | 2015-02-04 | 胜利油田孚瑞特石油装备有限公司 | A kind of gas well at HTHP hermetic seal threaded connection structure of petroleum casing pipe |
| CN106869820A (en) * | 2015-12-10 | 2017-06-20 | 盘锦辽河油田金环实业有限责任公司 | A kind of new hermetic seal special buckle oil pipe |
| CN109505530A (en) * | 2018-12-23 | 2019-03-22 | 扬州龙川钢管有限公司 | A kind of tubing and casing Hermetical connecting structure |
| CN209369742U (en) * | 2018-12-23 | 2019-09-10 | 扬州龙川钢管有限公司 | A kind of tubing and casing Hermetical connecting structure |
| CN209855720U (en) * | 2018-12-23 | 2019-12-27 | 扬州龙川钢管有限公司 | Novel sealed oil casing structure that detains |
-
2018
- 2018-12-23 CN CN201811577064.2A patent/CN109488223B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203463035U (en) * | 2013-07-05 | 2014-03-05 | 宝鸡石油钢管有限责任公司 | Screwed joint for petroleum casing pipe |
| CN204139992U (en) * | 2014-07-16 | 2015-02-04 | 胜利油田孚瑞特石油装备有限公司 | A kind of gas well at HTHP hermetic seal threaded connection structure of petroleum casing pipe |
| CN106869820A (en) * | 2015-12-10 | 2017-06-20 | 盘锦辽河油田金环实业有限责任公司 | A kind of new hermetic seal special buckle oil pipe |
| CN109505530A (en) * | 2018-12-23 | 2019-03-22 | 扬州龙川钢管有限公司 | A kind of tubing and casing Hermetical connecting structure |
| CN209369742U (en) * | 2018-12-23 | 2019-09-10 | 扬州龙川钢管有限公司 | A kind of tubing and casing Hermetical connecting structure |
| CN209855720U (en) * | 2018-12-23 | 2019-12-27 | 扬州龙川钢管有限公司 | Novel sealed oil casing structure that detains |
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| Publication number | Publication date |
|---|---|
| CN109488223A (en) | 2019-03-19 |
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Effective date of registration: 20240428 Address after: 225200 Xinggang Road, Economic Development Zone, Jiangdu District, Yangzhou City, Jiangsu Province Applicant after: Yangzhou Longchuan Energy Equipment Co.,Ltd. Country or region after: China Address before: 225200 Xinggang Road, Daqiao Town, Jiangdu District, Yangzhou City, Jiangsu Province Applicant before: YANGZHOU LONTRIN STEEL TUBE Co.,Ltd. Country or region before: China |
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