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Oil sleeve joint and oil sleeve assembly

A technology for oil casing and external threaded joints, applied in casing, drill pipe, drilling equipment and other directions, can solve the problems of poor resistance to composite loads, low connection strength of threaded joints, and high production and processing costs

Pending Publication Date: 2021-08-20
衡阳华菱连轧管有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to its own design defects, the standard API threaded oil casing has problems such as low connection strength of threaded joints, poor resistance to combined loads, and lack of gas sealing performance. It is not suitable for harsh well conditions. It is mainly used in shallow wells and low pressure wells Well conditions with low working conditions
[0003] In an oil-casing joint known to the inventor, the sealing structure of the oil-casing joint is close to the shoulder, and its sealing performance is seriously affected by the stress state of the positioning shoulder, the stability of the sealing performance is not high, and the oil-casing thread In order to achieve 100% compression performance, joints often need to adopt the pipe end necking process, which leads to high production and processing costs

Method used

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  • Oil sleeve joint and oil sleeve assembly
  • Oil sleeve joint and oil sleeve assembly
  • Oil sleeve joint and oil sleeve assembly

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Such as Figure 1 to Figure 5 As shown, in the embodiment of the present invention, the oil-casing joint includes an externally threaded joint 1 and an internally threaded joint 2, and the internally threaded joint 2 is threadedly connected to the externally threaded joint 1; wherein, along the direction parallel to the axis of the oil-casing joint A threaded structure 30 , a first groove 40 , a sealing structure 50 , a second groove 60 and a shoulder structure 70 are sequentially provided between the externally threaded joint 1 and the internally threaded joint 2 , and the sealing structure 50 includes a first sealing tapered surface 11 And the second sealing cone surface 21 that is sealingly matched with part of the first sealing cone surface 11, the first sealing cone surface 11 is set on a part of the outer wall surface of the external threaded joint 1, and the second sealing cone surface 21 is set on a part of the internal threaded joint 2 on the inner wall.

[00...

Embodiment 2

[0075] The difference between Embodiment 2 and Embodiment 1 is that, as Figure 6As shown, in the second embodiment, the groove surface includes a first outer bevel 22 and a second cylindrical surface 23, from the thread structure 30 to the direction of the shoulder structure 70, the second sealing tapered surface 21, the first outer bevel 22, the second Cylindrical surface 23 and the fourth arc R 22 connected in sequence, and the first outer bevel 22 gradually moves away from the axis of the oil-casing joint, and there is an angle β between the first outer bevel 22 and the axis of the oil-casing joint 2 .

[0076] In the above setting, the groove surface includes a first outer slope 22 and a second cylindrical surface 23, the first outer slope 22, the second cylindrical surface 23, the fourth arc R 22 1, part of the inner shoulder surface 24 and part of the first sealing tapered surface 11 jointly form a second groove 60, the second groove 60 can store excess thread grease,...

Embodiment 3

[0081] The difference between Embodiment 3 and Embodiment 1 is that, as Figure 7 and Figure 8 As shown, in the third embodiment, the outer shoulder surface 12 includes a plurality of second outer slopes 121 connected in sequence, and the inner shoulder surface 24 includes a plurality of third outer slopes 241 corresponding to the plurality of second outer slopes. In the direction of the thread structure 30 to the shoulder structure 70, the multiple second outer slopes 121 and the multiple third external slopes 241 are gradually away from the axis of the oil-casing joint, and the adjacent two second external slopes 121 and the oil-casing joint The included angles between the axes are different, and the included angles between two adjacent third outer slopes 241 and the axis of the oil-casing joint are different.

[0082] In the above settings, the outer shoulder surface 12 of the externally threaded joint 1 is a composite shoulder surface structure composed of multiple surfa...

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Abstract

The invention provides an oil sleeve joint and an oil sleeve assembly. The oil casing joint comprises an external thread joint, and an internal thread joint, wherein the internal thread joint is in threaded connection with the external thread joint; a thread structure, a first groove, a sealing structure, a second groove and a shoulder structure are sequentially arranged between the external thread joint and the internal thread joint in the direction parallel to the axis of the oil sleeve joint, and the sealing structure comprises a first sealing conical surface and a second sealing conical surface in sealing fit with part of the first sealing conical surface; and the first sealing conical surface is arranged on a part of the outer wall surface of the external thread joint, and the second sealing conical surface is arranged on a part of the inner wall surface of the internal thread joint. According to the technical scheme, the oil sleeve joint has excellent stable sealing performance and compression resistance under the action of combined loads.

Description

technical field [0001] The invention relates to the technical field of oil pipeline engineering, in particular to an oil casing joint and an oil casing assembly. Background technique [0002] As the development environment of oil and gas fields becomes more and more complex, more stringent requirements are put forward for the sealing performance of oil casing threaded joints, that is, in various complex and harsh working conditions such as tension, compression, internal pressure, external pressure, bending, etc. Factors still maintain excellent sealing robustness and excellent compression performance. Due to its own design defects, the standard API threaded oil casing has problems such as low connection strength of threaded joints, poor resistance to combined loads, and lack of gas sealing performance. It is not suitable for harsh well conditions. It is mainly used in shallow wells and low pressure wells Well conditions with low working conditions. [0003] In an oil-casin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B17/08
CPCE21B17/08
Inventor 李小兵胡志立李建亮田研吴丹黄电源张垂贵付强李健胡新太冉雪辉
Owner 衡阳华菱连轧管有限公司
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