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A special threaded joint for oil well pipe

A special thread and threaded joint technology, used in drill pipes, casings, drilling equipment, etc., can solve problems such as leakage and poor torque resistance, and achieve the effects of large sealing area, improved torque resistance, and improved sealing ability.

Active Publication Date: 2019-01-18
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

[0004] Aiming at the deficiencies of the existing technology, the present invention provides a special threaded joint for oil well pipes, which solves the problems of poor torque resistance and easy leakage of the existing threaded joint, and improves the safety of the threaded joint under severe working conditions of high temperature and high pressure

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  • A special threaded joint for oil well pipe
  • A special threaded joint for oil well pipe
  • A special threaded joint for oil well pipe

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Embodiment Construction

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

[0026] Such as Figure 1-5 As shown, the oil well pipe special threaded joint of the present invention includes an externally threaded joint 1 and an internally threaded joint 2 assembled together. The threads of the externally threaded joint 1 and the internally threaded joint 2 are hook-shaped variable tooth wide threads. The seal consists of double seals, the double seals include a set of cone / cone seals 3 and a set of cylindrical / spherical seals 4, the special threaded joint has no shoulder; t...

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Abstract

The invention discloses a special thread joint for an oil well pipe. The special thread joint comprise an outer thread joint body and an inner thread joint body which are assembled together; threads of the outer thread joint body and the inner thread joint body are hook-shaped variable-tooth-width threads, a main seal of the thread joint is composed of double seal bodies including a group of conical seal bodies and a group of cylindrical / spherical seal bodies, and the thread joint is free of a shoulder. By adopting the hook-shaped variable-tooth-width threads, all the threads can bear the anti-torque effect, therefore, the anti-torque capacity of the thread joint is greatly improved, and meanwhile the thread joint can bear large axial stretching and compression loads; due to the fact that the main seal is composed of double seal bodies, the sealing reliability of the thread joint is greatly enhanced, and the serving safety of the thread joint under harsh working conditions is guaranteed; due to the fact that the traditional double shoulder is not adopted, the possibility of generating crevice corrosion in the serving process of the joint is avoided; compared with wedge-shaped threads, the hook-shaped threads are easy to process, high in production efficiency and convenient to use and popularize.

Description

technical field [0001] The invention belongs to the fields of petroleum drilling, development and production, and in particular relates to a special threaded joint for oil well pipes. Background technique [0002] The tubing and casing threads used in the oil industry are mainly API (American Petroleum Institute, American Petroleum Institute) standard round thread and API standard buttress thread. API round thread has poor bearing capacity, and the joint is prone to slippage and failure under the action of axial tensile load. API partial trapezoidal thread has poor sealing performance, and gas is prone to leakage. Therefore, ordinary API standard thread joints cannot meet the requirements of high-pressure gas wells. [0003] In order to improve the sealing performance of threaded joints under complex working conditions, many special threaded joints have been designed and developed. Mainstream special threaded joints are designed with torque shoulders and metal / metal sealing...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B17/042
CPCE21B17/042
Inventor 潘志勇林凯杨扬杨鹏李孝军龙岩娄琦宋成立余志
Owner BC P INC CHINA NAT PETROLEUM CORP
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