S-shaped shoulder variable tooth width wedge-shaped coupling structure and oil well pipe structure

Abstract

The invention discloses an S-shaped shoulder variable tooth width wedge-shaped coupling structure and an S-shaped shoulder variable tooth width wedge-shaped oil well pipe structure in a petroleum steel pipe industry. On the longitudinal cross section of a coupling body, an inner tooth crest outer arc located at the innermost end position and an inner sealing surface transition cambered surface are in smooth transition, the inner sealing surface transition cambered surface and an inner sealing surface are in smooth transition, the inner sealing surface and an inner sealing arc surface are in smooth transition, the inner sealing arc surface and an inner shoulder surface transition arc are in smooth transition, the inner shoulder surface transition arc and a first inner sub sealing surface are in smooth transition, the first inner sub sealing surface and an inner shoulder surface included angle arc are in smooth transition, the inner shoulder surface included angle arc and a second inner sub sealing surface are in smooth transition, and the second inner sub sealing surface is connected with the wall of an inner hole of a coupling shoulder. Taper and taper radial diameter sealing and peak arc sealing are adopted, and therefore the sealing performance of connection of screwed joints is improved. A non-planar type wide-angle reversed V-shaped structure is adopted for a shoulder surface, and therefore compressive load resistant capacity, the torque resistance and the high-sealing performance under the bending resistant condition are remarkably 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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