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A special thread gas-tight oil-casing joint for ultra-deep wells

A special thread and air-tight technology, applied in the direction of casing, drill pipe, drilling equipment, etc., can solve the problems of threaded joints that are prone to sticking, torque shoulder shear failure, uneven thread stress distribution, etc., so that it is not easy to trip , prevent yield failure, enhance the effect of fatigue resistance

Inactive Publication Date: 2018-07-10
SOUTHWEST PETROLEUM UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the technical problems of threaded joints in ultra-deep oil and gas wells that are prone to sticking, seal failure, torque shoulder shear failure, joint tripping, and uneven thread stress distribution; As well as ensuring reliable connection and sealing under complex working conditions such as tensile loads, this invention proposes a special threaded gas-tight oil-casing joint for ultra-deep wells

Method used

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  • A special thread gas-tight oil-casing joint for ultra-deep wells
  • A special thread gas-tight oil-casing joint for ultra-deep wells
  • A special thread gas-tight oil-casing joint for ultra-deep wells

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Embodiment Construction

[0020] The oil-casing joint of the present invention is composed of a pipe body part A and a coupling part B, and the joint is composed of three-stage auxiliary sealing (-15° angle torque shoulder 1, right-angle torque shoulder 2, right-angle torque shoulder 4), two-stage The main seal (cone / cone seal structure 3, spherical / cone seal structure 5), relief groove 6, connecting thread 7, deformation release space 8 and so on. The spherical surface of the first main seal is on the male buckle, and the radius of the spherical surface is 40mm~60mm; the second main seal adopts a variable cone structure, and the taper of the female buckle is 1:10, and the taper of the male buckle is 1:8; deformation release The radius of the outer transition arc of the space is 1.2mm, and the radius of the inner transition arc is 0.6mm; the thread is a new type of thread structure designed on the basis of a partial trapezoidal thread, and its guide surface is based on a 5° partial trapezoidal thread gu...

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Abstract

The invention relates to a special-thread gas seal oil sleeve joint for ultra-deep wells. The special-thread gas seal oil sleeve joint comprises a pipe portion and a coupling portion. The joint is composed of two main seals (conical / conical sealing structure and spherical / conical sealing structure), three auxiliary seals (-15-degree-angle torque shoulder and two right-angle torque shoulders), a deformation release space, a tool withdrawal groove and a connecting thread. The technical problem that an ultrahigh-pressure oil-gas well threaded joint is prone to thread gluing, sealing invalidation and torque shoulder shearing invalidation, low in resistance to stress corrosion and threaded connection strength and nonuniform in stress distribution is solved, and the special-thread gas seal oil sleeve joint can be used for high-temperature high-pressure oil-gas wells, deep wells, the ultra-deep wells, directional wells and horizontal wells.

Description

technical field [0001] The invention relates to a threaded joint of an oil well pipe used in the petroleum industry, in particular to a special threaded air-tight oil-casing joint used in an ultra-deep well. Background technique [0002] The oil and casing in the petroleum industry are 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, high temperature and high pressure resistance of the threaded joint The quality of the capacity and anti-overtorque performance directly affects the connection quality of the oil well pipe. [0003] With the continuous development of oil and gas fields at home and abroad, many deep wells, ultra-deep wells, high temperature and high pressure oil and gas wells containing corrosive gases have appeared in China. The air tightness of traditional API (American Petroleum Institute) joints and some special threaded joints It is difficult t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B17/08
CPCE21B17/08
Inventor 莫丽涂炼付强董社霞李英松王磊杨雨张光才
Owner SOUTHWEST PETROLEUM UNIV
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