Sealing variable-tooth-width wedge type coupling structure and oil well pipe structure

Abstract

The invention discloses a sealing variable-tooth-width wedge type coupling structure and oil well pipe structure. An inner tooth crest outer arc arranged at the innermost end of the longitudinal section of a coupling body is in smooth transition with an inner sealing face transitional plane, the inner sealing face transitional plane is in smooth transition with an inner transitional cambered surface, the inner transitional cambered surface is in smooth transition with an inner sealing face arc, the inner sealing face arc is in smooth transition with an inner vertex cambered surface, the inner 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. The radial sealing face structure of an arc and an arc and the torque resistant circular bead structure of a convex face or a concave face or a plane are added to the threaded end portion of the sealing variable-tooth-width wedge type coupling structure. The sealing performance, the bending resistant capacity, the compressive load resistant capacity and the high torque resistant performance of screwed joint connection are obviously improved through the coordination of wedge type threads, the radial sealing face structure of the arc and the arc and a torque resistant circular bead.

Description

technical field [0001] The invention discloses a sealing variable tooth width wedge type coupling structure used in the oil drilling industry, and also discloses a sealing variable tooth width wedge type 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 mor...

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.

Images