Airtight connection structure for oil well pipe

Abstract

An airtight connection structure for an oil well pipe comprises a thread structure and a sealing face structure, which are matched between a pipe body and a hoop; the pipe body threads are external and buttress threads; the hoop threads are internal and buttress threads; the pipe body sealing face comprises an outer main sealing face, a first outer assisting sealing face and a second outer assisting sealing face, which are at the end side of the end part of the pipe body; the hoop sealing face comprises an inner main sealing face corresponding to the outer main sealing face of the pipe body and an inner assisting sealing face corresponding to the first outer assisting sealing face of the pipe body; a bearing face angle of the pipe body is -1 degrees- -10 degrees, the hoop carrying face angle is -1 degrees 2 minutes- -12 degrees 30 minutes, the pipe body guiding face angle is 5 degrees - 15 degrees, and the hoop guiding face angle is 5 degrees 2 minutes to 17 degrees 30 minutes; and after the threads of the pipe body and the hoop are screwed, the threads of the negative angle carrying faces, the first outer assisting sealing face and the inner assisting sealing face jointly form a wedge structure. The airtight connection structure for the oil well pipe achieves the 100% strength as the pipe body by thread connection, and the compression efficiency achieves 100% by the IV level test evaluation of ISO (international standard organization) 13697.

Description

technical field [0001] The invention relates to oil well pipe technology, in particular to an airtight connection structure for oil well pipe. Background technique [0002] With the development of the petroleum industry, the difficulty of mining is getting higher and higher, and the API thread can no longer meet the performance requirements of the oil field for threaded oil well pipe gas tightness, connection strength, and corrosion resistance. As far as the Tarim Sanchao gas well is concerned, since the oil well pipes used for operations are subjected to large tension, compression, and internal pressure, the use of oil well pipes with special connection forms is also very risky. Therefore, it is necessary to develop a suitable special threaded connection form to meet the mining needs. [0003] In the existing threaded connection form of oil well pipe, the bearing surface of the thread is mainly at a positive angle, and the angles of the bearing surface of the male and fema...

AI Technical Summary

Problems solved by technology

There is no sealing surface, or the sealing surface structure is only two-stage

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