Plane-shoulder planoconic sealing surface variable-tooth-width wedge-type coupling structure and oil well pipe structure

Abstract

The invention discloses a plane-shoulder planoconic sealing surface variable-tooth-width wedge-type coupling structure and an oil well pipe structure which are used in the industry of petroleum steel pipes. An inner tooth crest outer plane at the innermost end of the longitudinal cross-section of a coupling body is connected with an inner sealing surface, the inner sealing surface is in smooth transition with an inner transition circular arc, the inner transition circular arc is in smooth transition with an inner shoulder inclined surface, the inner shoulder inclined surface is in smooth transition with an inner shoulder circular arc, and the inner shoulder circular arc is in smooth transition with an inner hole wall surface of a coupling shoulder. A conical surface and a radial seal and anti-torque shoulder structure of the conical surface are additionally arranged on a threaded end portion of the plane-shoulder planoconic sealing surface variable-tooth-width wedge-type coupling structure. Through matching of wedge-type threads, the conical surface and an interference seal and anti-torque shoulder of the conical surface, sealing performance, bend resistance, compressive load resistance and high torque resistance of connection through screwed joints are remarkably and effectively improved.

Description

technical field [0001] The invention discloses a collar structure used in the oil drilling industry, and also discloses an oil well pipe structure used in the oil drilling industry. Background technique [0002] At present, the threaded connection structure of oil casing and pipe in the oil well pipe industry is basically improved and innovated in accordance with API SPEC 5B "Code for Machining, Measurement and Inspection of Casing, Tubing and Line Pipe Threads". The overall connection quality is compared with API The quality of the threaded connection required by the standard has gradually been greatly improved, but it still cannot meet the requirements of oil field exploitation. Gradually, all oil fields in the world are putting forward higher and more ideal requirements for threaded connections, especially the requirements for the main performance indicators of oil well pipes are becoming more and more stringent. Contents of the invention [0003] One of the purposes o...

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Problems solved by technology

[0002] At present, the threaded connection structure of oil casing and pipe in the oil well pipe industry is basically improved and innovated in accordance with API SPEC 5B "Code for Processing, Measurement and Inspection of Casing, Tubing and Line Pipe Threads". The overall connection quality is compared with API The quality of the threaded connection required by the standard has been gradually improved, but it still cannot meet the requirements of oil field production.

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