Cambered surface circular bead type varied tooth-width wedge type coupling structure and oil well pipe structure

Abstract

The invention discloses a cambered surface bead type varied tooth-width wedge type coupling structure and an oil well pipe structure. Coupling inner thread sections are arranged at the inner walls of the two ends of a coupling body, and a coupling circular bead is arranged between the two coupling inner thread sections. Further, the inner bearing surface located at the most inner end position on the longitudinal section of the coupling body and an inner transitional circular arc are in smooth transition, the circle centers of the circular arcs of the inner transitional circular arcs are located in the coupling circular bead, the inner transitional circular arcs and inner sealing circular arcs are in smooth transition, the circle centers of the inner sealing circular arcs are located in the coupling inner thread section, the inner sealing circular arcs and inner sealing inclined surfaces are in smooth transition, and the inner sealing inclined surfaces are intersected with the coupling circular bead in acute angles. The cambered surface bead type varied tooth-width wedge type coupling structure and oil well pipe structure greatly increases the sealing performance and the counter bending capability of a thread connector, compression resisting capacity and high torque resisting performance.

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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