Multi-plane sealing tooth-width-changing wedge type coupling structure and oil well pipe structure

Abstract

The invention discloses a coupling structure and an oil well pipe structure which are used in petroleum steel pipe industries. On the longitudinal section of a coupling body, an inner tooth crest outer plane located at the most inner end 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 the arc face of the peak of an inner circular bead, the arc face of the peak of the inner circular bead is in smooth transition with the face of the inner circular bead, and the face of the inner circular bead is connected with the inner hole wall face of a coupling circular bead through a circular bead. A metal and metal radial multi-seal structure with three tapered planes combined and a plane or arc face type anti-torque circular bead are added to the threaded end portion of the coupling structure. Wedge type threads, the multi-seal structure with the three tapered planes combined and the anti-torque circular bead are matched, and therefore the sealing performance, the anti-bending capacity, the compressive load resistant capacity and the high anti-torque performance of threaded connector connection are obviously 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] The purpose of the pr...

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