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Oil/sleeve pipe threaded connection joint with air-tight structure

A threaded connection and air-sealing technology, applied in casing, drill pipe, drilling equipment, etc., can solve the problems of poor air-sealing performance, low connection strength, unable to meet engineering technical requirements, etc., to achieve reliable sealing, high connection strength, The effect of fast buckle

Active Publication Date: 2013-08-07
大庆恩博科技开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

API standard round thread and partial trapezoidal thread joints are routinely used in our country, but the biggest disadvantages of this joint are: low connection strength and poor airtight performance
With the increasingly harsh drilling environment of oil and gas wells and the rapid development of oil and gas production technology, ordinary API standard joints can no longer meet the existing engineering technical requirements

Method used

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  • Oil/sleeve pipe threaded connection joint with air-tight structure
  • Oil/sleeve pipe threaded connection joint with air-tight structure
  • Oil/sleeve pipe threaded connection joint with air-tight structure

Examples

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Embodiment Construction

[0020] In order to make the present invention more comprehensible, a preferred embodiment is described in detail below with accompanying drawings.

[0021] In order to improve the deficiencies of common API standard threaded joints, the present invention adopts a non-API standard special structural thread design on the basis of the API standard, that is, the size, steel grade, and wall thickness are based on the API standard, and the connection structure is adopted. The design of the special threaded connection structure adds special structures such as anti-torque shoulders and metal-to-metal cone seals, which greatly improves the strength and reliability of the threaded connection.

[0022] The oil / casing threaded connection joint with an airtight structure provided by the present invention can be used on oil pipes or casings, such as figure 1 As shown, it includes a pipe body 1 with external threads, and a coupling 2 with internal threads is sheathed on the pipe body 1 . to...

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Abstract

The invention provides an oil / sleeve pipe threaded connection joint with an air-tight structure. The oil / sleeve pipe threaded connection joint comprises a pipe body with an external thread, wherein a coupling with an internal thread is sleeved outside the pipe body; and the internal thread and the external thread are provided with a guide surface and a negative angle bearing surface. The oil / sleeve pipe threaded connection joint is characterized in that: the angle of the negative angle bearing surface is between -3 degrees and -5 degrees; a conical sealing surface is formed on the end part ofthe pipe body; the conical sealing surface is in clearance fit with the inner wall of the coupling to fulfill the aim of sealing; and the interference length is more than 17.8 millimeters. The invention has the advantages that: the joint has high connecting strength, can be matched with the pipe body at equal strength or higher strength than the pipe body, is suitable for deep wells and ultra-deep wells, is sealed reliably, is suitable for high-pressure gas wells, oil wells and thermal production wells, has high bending resistance, is easy to screw on, can be screwed on rapidly without causing wrong screwing, is suitable for drilling operation in severe environments such as deserts, oceans and the like, has a high anti-sticking performance, can be screwed and unscrewed repeatedly without damaging the screw thread, and has high over torque resistance and high corrosion resistance.

Description

technical field [0001] The invention relates to an oil pipe or casing connecting joint structure used in oil drilling. Background technique [0002] Tubing and casing are deep machining products with high requirements and large consumption in the process of oil drilling and production. In actual use, threads are used to connect a single oil pipe or casing into a long pipe string that is thousands of meters long and can withstand hundreds of atmospheres, which is equivalent to a tubular high-pressure vessel. Among them, the technical performance of the threaded connection is the key to ensuring the safety and reliability of the drilling process. API standard round thread and partial trapezoidal thread joints are routinely used in our country, but the biggest disadvantages of this joint are: low connection strength and poor airtight performance. With the increasingly harsh drilling environment of oil and gas wells and the rapid development of oil and gas extraction technolo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B17/02E21B17/08
Inventor 夏庆华
Owner 大庆恩博科技开发有限公司
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