Special round thread highly-torque-resistant oil casing coupling

A technology for connecting joints and round threads, which is applied in the field of special round thread high-torque oil casing connection joints, can solve the problems of unsatisfactory use effect, weak bending resistance, leakage of threaded connections, etc. Good buckle performance, not easy to buckle

Inactive Publication Date: 2012-07-18
WUXI SEAMLESS OIL PIPE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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.

Method used

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  • Special round thread highly-torque-resistant oil casing coupling
  • Special round thread highly-torque-resistant oil casing coupling
  • Special round thread highly-torque-resistant oil casing coupling

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Embodiment Construction

[0019] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0020] 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, outer seal cylinder 13, inner seal cylinder 14, outer seal end face 15, inner seal end face 16, outer end fillet 17, inner end fillet 18, outer end inner Fillet 19, inner end face outer fillet 20, inner sealing surface 21, outer sealing surface 22, middle cylindrical surface 23, middle diameter line 24, etc.

[0021] Such as figure 1 , figure 2 As shown, the present invention is a special round thread high-torque oil-casing connection joint, which includes a coupling 1 connected by a thread 4 and pipe bodies 2 and 3 . The coupling 1 and the pipe body 2 are closely matched based on the virtual pit...

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Abstract

The invention relates to a special round thread highly-torque-resistant oil casing coupling, which comprises a hoop and a pipe which are in threaded connection. The form of the thread belongs to a special round thread with an arc-shaped tooth crest and an arc-shaped tooth bottom, and the flank angle of a guiding face of the thread is different from that of a bearing face. A middle cylindrical surface is arranged on the inner wall of the hoop, and metal sealing structures are arranged between the two end surfaces of the middle cylindrical surface and the ends of the pipe respectively. Each metal sealing structure comprises an inner sealing face and an outer sealing face. The inner sealing face includes an inner sealing arc-shaped face arranged between the end face of the middle cylindrical surface and the end of an internal thread of the hoop, and an inner sealing end arc-shaped face which is perpendicular to the inner sealing arc-shaped face. The outer sealing face includes an outer sealing arc-shaped face arranged on the outer wall of the end of the pipe and an outer sealing end arc-shaped face which is perpendicular to the outer sealing arc-shaped face. The special round thread highly-torque-resistant oil pipe coupling is provided with the dissymmetrical special round thread, is provided with the double arc type metal sealing structures, and is high in intensity, fine in sealing performance, and high in torque resistance and bending resistance.

Description

technical field [0001] The invention relates to an oil well pipe thread joint used in the petroleum industry, in particular to a special round thread high torque resistance 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B17/042
Inventor 冯波闫永军朱建国徐文耿玉娟
Owner WUXI SEAMLESS OIL PIPE
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