High-airtightness special buttress thread pipe joint

A trapezoidal, high-sealing technology, used in drill pipes, casings, drilling equipment, etc., can solve the problems of weak torque resistance, can not meet the requirements of oilfield use, low connection strength, etc., and achieve the effect of increasing connection strength.

Inactive Publication Date: 2012-09-19
WUXI SEAMLESS OIL PIPE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing API (American Petroleum Institute) partial trapezoidal thread joints have shortcomings such as weak torque resistance, low connection strength, poor sealing performance, and poor collapse resistance.
Oil wel

Method used

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  • High-airtightness special buttress thread pipe joint
  • High-airtightness special buttress thread pipe joint
  • High-airtightness special buttress thread pipe joint

Examples

Experimental program
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Example Embodiment

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

[0020] Figure 1~Figure 5 It includes coupling 1, pipe body 2, partial trapezoidal internal thread 3, partial trapezoidal external thread 4, wedge internal thread 5, wedge external thread 6, internal sealing structure 7, external sealing structure 8, intermediate diameter line 9, internal platform Shoulder cylinder surface 10, taper 11, pitch 12, tooth height 13, tooth profile tooth width 14, tooth profile groove width 15, flank angle 16, tooth profile arc 17, inner cone surface 18, outer cone surface 19, inner seal Surface thickness 20, outer sealing surface thickness 21, inner sealing surface transition arc 22, outer sealing surface transition arc 23, inner vertex arc 24, outer vertex arc 25, inner shoulder arc 26, outer shoulder arc 27. Inner shoulder angle 28, outer shoulder angle 29, inner shoulder plane chamfer 30, pipe end plane chamfer 31, inner sh...

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Abstract

The invention relates to a high-airtightness special buttress thread pipe joint, which comprises a coupling and a pipe body, wherein the middle part of the coupling is provided with an inner step cylindrical surface; the two ends of the coupling are provided with standard buttress inner threads; wedged inner threads are formed at the back ends of the buttress inner threads; the end part of the pipe body is provided with a standard buttress outer thread; a wedged outer thread is formed at the front end of the buttress outer thread; metal sealing structures are arranged between the two end faces of the inner step cylindrical surface and the end part of the pipe body respectively, and comprise an inner sealing structure arranged on the coupling, and an outer sealing structure arranged on the pipe body; the inner sealing structure comprises an inner conical surface and an inner shoulder angle projecting outwards; and the outer sealing structure comprises an outer conical surface and an outer shoulder angle depressing inwards. The wedged threads and a non-planar shoulder sealing structure are arranged on the end parts of the standard buttress threads, so that the connection strength, sealing performance, anti-bending capability, compression load resistance and anti-toque performance of the joint are improved.

Description

technical field [0001] The invention relates to an oil well pipe threaded joint used in the petroleum industry, in particular to a high-tight special partial trapezoidal threaded pipe 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 kilometers. Among them, the connection strength, sealing performance, bending resistance, torque resistance and tensile load of the threaded joints The quality of performance directly affects the connection quality of oil well pipes. Different geological structures require different types of threaded oil well pipes to meet the requirements of use. [0003] With the continuous development of oil field exploitation, the requirements for threaded joints of oil well pipes are becoming more and more stringent, especially the requirements for the main performance indicators of oil well pipes are getting higher and highe...

Claims

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Application Information

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IPC IPC(8): E21B17/02
Inventor 冯波耿玉娟
Owner WUXI SEAMLESS OIL PIPE
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