An oil pipe threaded connection structure

A threaded connection, oil pipe technology, applied in drill pipe, casing, drill pipe and other directions, can solve the problem that joint performance needs to be further improved, and achieve the effect of improving comprehensive performance, ensuring sealing integrity, and ensuring structural integrity

Active Publication Date: 2019-09-03
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the special threaded joint adopts the improved partial trapezoidal pipe thread, due to the existence of incomplete thread, the performance of the joint needs to be further improved

Method used

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  • An oil pipe threaded connection structure
  • An oil pipe threaded connection structure
  • An oil pipe threaded connection structure

Examples

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Embodiment Construction

[0020] The present invention will be further described below in conjunction with specific examples, and the given examples are only to illustrate the present invention, rather than to limit the scope of the present invention.

[0021] like Figure 1-3 As shown, the oil pipeline threaded connection structure of the present invention includes an externally threaded joint 1 and an internally threaded joint 2 assembled together, and all the engaged external threads and internal threads in the structure are complete threads.

[0022] The thread of the externally threaded joint 1 includes externally threaded variable pitch threads 3 and externally threaded constant pitched threads 4; the pitch line of the externally variable pitched threads 3 coincides with the pitchline of the externally constant pitched threads 4; the externally threaded The tooth top line P1, the tooth bottom line P2 and the middle diameter line P of the variable tooth height thread 3 intersect on the outer surfa...

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Abstract

The invention provides a threaded connection structure of petroleum pipes. All external threads and internal threads engaged in an external thread joint and an internal thread joint are complete threads, and the problem of the poor ability in bearing tensile, compression, bending, torsion and sealing of incomplete threads is solved; and all the external threads and the internal threads in the threaded connection structure are complete threads, all the external thread tooth tops and the internal thread tooth bottoms as well as all the external thread tooth bottoms and the internal thread toothtops after being engaged make closely contact without clearance, and through the engaged threaded connection structure, not only is the structural integrity ensured, but also the seal integrity is ensured, and comprehensive performance after the internal threads and the external threads are connected is improved greatly.

Description

technical field [0001] The invention relates to the fields of oil drilling, development and production, in particular to an oil pipe screw connection structure. Background technique [0002] API (American Petroleum Institute, American Petroleum Institute) partial trapezoidal thread is widely used in the petroleum industry due to its strong resistance to axial tension and axial compression. At present, the thread shape of a large number of special threaded joints is also based on the improvement of API partial trapezoidal thread. of. When the API partial trapezoidal pipe thread is engaged, the internal thread is a complete thread with equal tooth height, a part of the external thread is a complete thread with equal tooth height, and the other nearly half of the length of the external thread is an incomplete thread. The presence of large helical spaces reduces the ability of threaded joints to withstand tension, compression, bending, torsion and sealing. Although the special...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B17/042
Inventor 潘志勇罗金恒王建军卢攀辉邝献任李丽锋宋成立
Owner BC P INC CHINA NAT PETROLEUM CORP
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