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A direct-connected gas-tight casing for high-temperature, high-pressure, ultra-deep wells

A high-temperature, high-pressure, ultra-deep well technology, applied in the direction of casing, drill pipe, drilling equipment, etc., can solve the problems of poor stress corrosion resistance of joints, sticking of threaded joints, and shear failure of torque shoulders, etc., to achieve optimization Thread stress distribution, prevention of thread sticking, and enhancement of fatigue resistance

Inactive Publication Date: 2018-08-17
SOUTHWEST PETROLEUM UNIV +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to solve the technical problems of high temperature and high pressure oil and gas well threaded joints that are prone to sticking, seal failure, torque shoulder shear failure, poor stress corrosion resistance of joints, poor threaded connection strength, and uneven stress distribution; Drilling cost, the present invention proposes a high-temperature high-pressure ultra-deep well direct-connected air-tight casing

Method used

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  • A direct-connected gas-tight casing for high-temperature, high-pressure, ultra-deep wells
  • A direct-connected gas-tight casing for high-temperature, high-pressure, ultra-deep wells
  • A direct-connected gas-tight casing for high-temperature, high-pressure, ultra-deep wells

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Embodiment Construction

[0019] The casing of the present invention is composed of a pipe body part A and a joint part B, and the joint part is composed of two-stage auxiliary seals (-15° angle torque shoulder 1, right-angle torque shoulder 3), two-stage main seals (arc surface / cone Surface sealing structure 2, spherical / cylindrical sealing structure 4), deformation release space 5, decompression groove 6, knife relief groove 7, threaded connection section and so on. The first main sealing arc is on the male buckle, the second main sealing spherical surface is on the female buckle, the transition arc 501 has a radius of 1.2mm; the transition arc 502 has a radius of 0.6mm; the second main sealing spherical surface has a radius of 40mm to 80mm; The taper of the first main sealing cone is 1:8~1:10; the angle of the thread guide surface is 15°~20°; the angle of the thread bearing surface is -4°~-6°; the tooth height of the external thread in zone I is 1.575mm ;The tooth height of internal thread in Zone I...

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Abstract

The invention relates to a directly-connected hermetically sealed sleeve for a high temperature and high pressure ultra-deep well, which comprises a sleeve body part and a joint part, wherein the joint part is composed of two stages of auxiliary seals (a torque shoulder with a -15-degree angle and a torque shoulder with a right angle), two stages of primary seals (a sealed structure with an arc surface or a conical surface and a sealed structure with a spherical surface or a cylindrical surface), a deformation release space, a pressure relief groove, a tool withdrawal groove, a threaded connection section, and the like. The directly-connected hermetically sealed sleeve solves the technical problems that a threaded joint part of a high temperature and high pressure oil and gas well easily causes thread gluing, the sealing fails, the shearing of the torque shoulders fails, the stress corrosion resistance of the joint is poor, the threaded connection strength is poor, the stress distribution is non-uniform, and the like. The directly-connected hermetically sealed sleeve can be used for high temperature and high pressure oil and gas wells, corrosive gas-containing gas wells, deep wells, ultra-deep wells, directional wells, horizontal wells, small hole wells, and the like.

Description

technical field [0001] The invention relates to a casing for oil and gas wells, in particular to a special threaded gas-tight casing capable of realizing safe exploitation of high temperature and high pressure ultra-deep oil and gas wells. technical background [0002] With the increasing exploitation of oil and gas fields at home and abroad, non-API oil casing pipes are more and more widely used in oil and gas fields due to their advantages of high connection strength, good sealing performance and convenient operation. At present, 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 and corrosion resistance of traditional API joints and some special threaded joints are difficult to meet the requirements. Currently, they are used in high temperature and high pressure wells. Some of the bushings have been glued and gas leaked. To meet the needs of such harsh working condit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B17/00E21B17/08
CPCE21B17/00E21B17/08
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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