Bending-resistant high-sealing variable-tooth-width wedge type coupling structure and oil well pipe structure

Abstract

The invention discloses a bending-resistant high-sealing coupling structure and oil well pipe structure which are used in a petroleum steel pipe industry. An inner tooth crest outer plane arranged at the innermost end of the longitudinal section of a coupling body is connected with a first inner sealing face, the first inner sealing face is connected with a second inner sealing face, the second inner sealing face is connected with a third inner sealing face, the third inner sealing face is in smooth transition with an inner circular bead vertex cambered surface, the inner circular bead vertex cambered surface is in smooth transition with an inner circular bead face, and the inner circular bead face is connected with the inner hole wall face of a coupling circular bead through a circular bead. A multi-sealing structure in radial interference fit is added to a threaded end portion, and a plane or cambered surface torque-resistant circular bead structure is adopted in a torque circular bead of the coupling body. A screwed joint is comprehensively composed of wedge type threads, multiple sealing and high torque resistance, and under the coordination of the multiple sealing structure and a high-resistant torque structure, the wedge type threads, the multiple sealing and the high-resistant torque can obviously and effectively improve the high-sealing performance, the bending-resistant capacity, the compressed load resistant capacity and the high torque resistant capacity of connection of the screwed joint.

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] The purpose of the pr...

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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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