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...

Examples

Embodiment Construction

[0021] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0022] Figure 1~Figure 5 Among them, including coupling 1, pipe body 2, pipe body 3, thread 4, tooth height 5, guide surface flank angle 6, bearing surface flank angle 7, tooth bottom arc 8, tooth top arc 9, Taper 10, pitch 11, tooth angle 12, inner sealing surface 13, outer sealing surface 14, middle cylindrical surface 15, outer conical surface 16, inner conical surface 17, outer sealing end arc surface 18, inner sealing end arc surface 19, outer Sealing end transition arc 20, inner sealing end transition arc 21, outer sealing angle transition arc 22, inner sealing angle transition arc 23, outer sealing surface end angle 24, inner sealing surface end angle 25, outer sealing angle 26, Inner sealing angle 27, outer sealing surface thickness 28, inner sealing surface thickness 29, inner sealing transition cone surface 30, inner sealing surf...

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...

Examples

Embodiment Construction

[0021] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0022] Figure 1~Figure 5 Among them, including coupling 1, pipe body 2, pipe body 3, thread 4, tooth height 5, guide surface flank angle 6, bearing surface flank angle 7, tooth bottom arc 8, tooth top arc 9, Taper 10, pitch 11, tooth angle 12, inner sealing surface 13, outer sealing surface 14, middle cylindrical surface 15, outer conical surface 16, inner conical surface 17, outer sealing end arc surface 18, inner sealing end arc surface 19, outer Sealing end transition arc 20, inner sealing end transition arc 21, outer sealing angle transition arc 22, inner sealing angle transition arc 23, outer sealing surface end angle 24, inner sealing surface end angle 25, outer sealing angle 26, Inner sealing angle 27, outer sealing surface thickness 28, inner sealing surface thickness 29, inner sealing transition cone surface 30, inner sealing surf...

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