Curved-surface ledge flat-cone-shaped sealing-surface tooth-change wide-wedge-shaped coupling structure and oil well pipe structure

Abstract

The invention discloses a curved-surface ledge flat-cone-shaped sealing-surface tooth-change wide-wedge-shaped coupling structure and an oil well pipe structure which are used in the petroleum steel pipe industry. The outer plane of an inner tooth crest of the most inner side is connected with a first inner sealing surface in the longitudinal section of a coupling body, and the first inner sealing surface is in smooth transition with an inner transition circular arc. The inner transition circular arc is in smooth transition with a second inner sealing surface which is in smooth transition with an inner ledge crest circular arc. The inner ledge crest circular arc is in smooth transition with a third inner sealing surface which is intersected with a coupling ledge inner hole wall by an acute angle. According to the curved-surface ledge flat-cone-shaped sealing-surface tooth-change wide-wedge-shaped coupling structure and the oil well pipe structure, the structures of the sealing surfaces of cone-shaped structures a V-shaped torque-resistance ledge are added on a threaded end, in the situation of complete clamping, match of the sealing surfaces of wedge-shaped threads and the cone-shaped structures and the V-shaped torque-resistance ledge greatly increases the sealing performance, the bend resistance capacity, the compressive load capacity and the high torque resistance performance of threaded connectors.

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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