High-sealing special circular thread oil sleeve connection connector

Abstract

The invention relates to a high-sealing special circular thread oil sleeve connection connector, comprising a coupling and a pipe body, wherein the coupling and the pipe body are connected through a thread; a tooth shape of the thread is a special circular thread with a circular-arc-shaped tooth top and a circular-arc-shaped tooth bottom; a central column surface is arranged in the middle of the inner wall of the coupling and metal sealing structures are respectively arranged between the two ends of the central column surface and the end part of the pipe body; an inner sealing face comprises an inner conical face and a transition conical face, which are arranged between the end faces of the central column surface and the end part of the inner thread of the coupling; the end faces of the central column surface are convex outwards to form an inner sealing included angle; an inner sealing end arc-shaped face is arranged between the inner sealing included angle and the inner conical face; an outer sealing face comprises an outer conical face arranged on the outer wall of the end part of the pipe body; and the end faces of the end part of the pipe body are concave inwards to form an outer sealing included angle. The special asymmetrical special circular threads are adopted and the metal sealing structures combined with a circular arc and large-angle convex-concave structure are arranged, so that the strength is high, the sealing performance is good, and the torque resistance and the bending capability are high.

Description

technical field [0001] The invention relates to an oil well pipe thread joint used in the petroleum industry, in particular to a high-tight special round thread oil casing joint. Background technique [0002] The oil and casing in the oil well pipe industry is mainly connected by threaded joints to form an oil and casing string with a length of several thousand meters. Among them, the strength requirements, sealing performance, tensile load and torque resistance of the threaded joint connection Higher requirements. [0003] At present, the structure of the existing oil-casing round thread connection is basically the API (American Petroleum Institute) standard round thread. The technology is relatively mature, but the use effect is not ideal. This kind of standard round threaded joint has poor sealing surface performance and weak bending resistance, which often leads to quality accidents such as leakage, breakage, and slippage at the threaded joint. Contents of the inventi...

AI Technical Summary

Problems solved by technology

[0003] At present, the existing oil casing round thread connection structure is basically API (American Petroleum Institute) standard round thread, the technology is relatively mature, but the use effect is not ideal

This kind of standard round thread joint has poor sealing surface performance and weak bending resistance, which often leads to quality accidents such as leakage, breakage, and slippage at the threaded joints.

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