Design and manufacturing method and sealing method of sealing structure of oil well pipe joint

A sealing structure and manufacturing method technology, applied in drilling equipment, design optimization/simulation, drilling pipe, etc., can solve the problems of compressive stress drop, failure to ensure normal contact and disappearance of metal on the sealing surface, etc.

Active Publication Date: 2020-09-04
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the downhole process of tubing, casing and other oil well pipes, resistance may be encountered, and it needs to be lifted and lowered many times, or even rotated, and the threaded joints may become loose, resulting in leakage of the joints of the oil well pipes
In the process of oil and gas production, the high-pressure gas flow causes the tubing string to vibrate. After long-term vibration, the thread may loosen, and the small elastic strain cannot ensure the normal contact of the metal on the sealing surface, and the compressive stress decreases or even disappears, resulting in leakage of the threaded joint.

Method used

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  • Design and manufacturing method and sealing method of sealing structure of oil well pipe joint
  • Design and manufacturing method and sealing method of sealing structure of oil well pipe joint
  • Design and manufacturing method and sealing method of sealing structure of oil well pipe joint

Examples

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example 1

[0198] Example 1. Using additive manufacturing technologies such as surfacing or 3D printing, the superelastic shape memory alloy is used to manufacture a sealing cladding layer, and the sealing cladding layer is laminated on the surface of the sealing structure of the oil well pipe joint to form the sealing structure shown in Figure 4.

[0199] According to the design results of step 1 and step 2, the width of the sealing cladding layer of the superelastic shape memory alloy is L≥2.2mm, which can take a value of L=3~10mm, and the strain of the superelastic shape memory alloy is ε e = 4%; ε s is the elastic deformation of the steel material of the oil well pipe joint body, which can be taken as ε s = 0.2%; the average value of the outer diameter and inner diameter of the oil well pipe joint is approximately equal to the outer diameter of the oil pipe or the diameter of the sealing circular surface D = 80mm. If the thickness of the sealing cladding layer of the superelastic sh...

example 2

[0200] Example 2: Apply the superelastic shape memory alloy sealing ring design and manufacturing technology to form the sealing structure shown in Figure 5 to realize the sealing of the oil well pipe joint.

[0201] According to the design results of step 1 and step 2, the width of the superelastic shape memory alloy sealing ring should be L≥2.2mm, which can be taken as L=3~8mm, and the elastic strain of the superelastic shape memory alloy is ε e = 4%; ε s is the elastic deformation of the steel material of the oil well pipe joint body, which can be taken as ε s = 0.2%; the average value of the outer diameter and inner diameter of the oil well pipe joint is approximately D = 80mm. If the thickness of the superelastic shape memory alloy sealing ring is t=3.0mm, then the radial interference of the sealing surface is θ=θ e +θ s =ε e t+ε s D=0.30mm. Outer diameter of sealing surface of male thread joint D ps It is basically the same as the existing TGRC special thread, nam...

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Abstract

The present application provides a design and manufacturing method of a sealing structure of an oil well pipe joint, and a sealing method. The manufacturing method includes: determining the contact pressure stress of the sealing surface of the oil well pipe, the elastic strain amount of the sealing structure material, the strength of the sealing structure material, The contact width of the sealing surface; according to the sealing safety margin of the oil well pipe, the material elastic strain of the sealing structure is greater than 0.5%; according to the contact compressive stress of the sealing surface, the material elastic strain of the sealing structure, and the strength of the sealing structure material, determine the sealing structure. Use material; according to the determined elastic strain amount of the sealing structure material, determine the used material of the sealing structure to be a superelastic alloy material with an elastic strain amount greater than 0.5%; manufacture the sealing structure according to the used material and its elastic strain amount. By using the various embodiments of the present application, the reliability of the joint sealing performance of the oil country tubular goods is improved.

Description

technical field [0001] The application belongs to the technical field of oil and gas drilling and exploitation, and in particular relates to a design and manufacturing method and a sealing method of a sealing structure of an oil well pipe joint. Background technique [0002] Oil well pipe is a special pipe for oil and gas production wells. It is connected by pipes with threaded joints and lowered into oil and gas wells to form a pipe string several kilometers long. In the stage of natural gas exploitation, the high-pressure natural gas in the downhole formation is transported to the ground through the pipe string, and the high-pressure natural gas flows from a dozen to one hundred MPa in the pipe, so the threaded joint of the oil well pipe must have sufficient gas tightness. [0003] In the prior art, the sealing structure of the oil well pipe joint mostly uses a special threaded joint structure, and the special threaded joint structure of the oil well pipe is composed of tw...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B17/02G06F30/20
CPCE21B17/02G06F2119/06G06F30/20G06F30/23E21B17/042
Inventor 王新虎王建东王鹏冯春韩礼红
Owner BC P INC CHINA NAT PETROLEUM CORP
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