Cambered surface and plane sealed variable tooth wide wedge-type coupling structure and oil well pipe structure

Abstract

The invention discloses a cambered surface and plane sealed variable tooth wide coupling structure and an oil well pipe structure used in the petroleum steel pipe industry. On a longitudinal cross-section of a coupling body, an internal tooth crest outer circular arc located at the innermost end is in smooth transition with an internal transition cambered surface, the internal transition cambered surface is in smooth transition with an internal conical sealing surface, the internal beveled sealing surface is in smooth transition with an internal arc-shaped sealing surface, the internal arc-shaped sealing surface is in smooth transition with an internal circular bead vertex cambered surface, the internal circular bead vertex cambered surface is in smooth transition with an internal circular bead surface, and the internal circular bead surface is connected with an inner bore wall surface of a coupling circular bead through a fillet. According to the cambered surface and plane sealed variable tooth wide coupling structure and the oil well pipe structure, a metal-to-metal radial seal structure combining a conical surface with a cambered surface and a plane anti-torque circular bead are additionally arranged on the end portion of a thread of the coupling structure. Through the matching of the wedge-shaped thread, the conical surface and cambered surface radial seal structure and the anti-torque circular bead, the sealing performance, the anti-bending capability, the compression load resisting capability and the high anti-torque performance of the connection of thread connectors are remarkably enhanced.

Description

Technical field [0001] The invention discloses a camber and plane sealing variable tooth width wedge type coupling structure used in the petroleum drilling industry. The invention also discloses a camber and plane sealing variable tooth width wedge type oil well used in the petroleum drilling industry. Tube structure. Background technique [0002] At present, the threaded connection structure of tubing and casing in the oil well pipe industry is basically improved and innovated in accordance with the API SPEC 5B "Code for Processing, Measurement and Inspection of Casing, Tubing and Line Pipe Threads". The overall connection quality is compared to API The threaded connection quality required by the standard has gradually improved, but it still cannot meet the requirements of oilfield exploitation. Gradually, the world's oil fields are putting forward higher and more ideal requirements for threaded connections, especially for the relevant main performance indicators of oil well pi...

AI Technical Summary

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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