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Special joint with sealing and connecting structure

A connection structure with sealing technology, which is applied in the direction of drilling equipment, earthwork drilling, drill pipe, etc., to achieve good connection, avoid processing accuracy problems, and facilitate processing

Pending Publication Date: 2020-08-11
江苏联冠兆星石化科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The main purpose of the present invention is to provide a special joint with a sealing and connection structure to solve the problem of sealing and connection when the "inner insulation pipe" is used in the process of thermal fluid collection

Method used

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Embodiment Construction

[0024] It should be noted that when an element is referred to as being “fixed” to another element, it can be directly on the other element or there can also be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may also be present.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field of the invention. The terms used herein in the description of the present invention are for the purpose of describing specific embodiments only, and are not intended to limit the present invention. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0026] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions ...

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Abstract

The invention discloses a special joint with a sealing and connecting structure, and relates to the technical field of thermal fluid and petroleum collecting and conveying equipment. The special jointis provided with a joint main body arranged at the lower end of a pipeline, an inner mounting part, a sealing surface and an outer mounting part, wherein the inner mounting part, the sealing surfaceand the outer mounting part are arranged on the joint main body; and the inner mounting part is provided with an inner thread used for being directly connected with the lower end of the pipeline, andthe outer mounting part is provided with an outer thread for being coupled with the pipeline. The special joint with the sealing and connecting structure can be used for solving the problems of sealing and connection when an internal thermal insulation pipe is used in the thermal fluid collection process, so that the dimensional accuracy, roughness and the like of the joint main body are easy to control, the joint main body is very convenient to replace and repair even if problems exist, and an oil pipe and a core pipe can still be well connected and sealed under the conditions of length change caused by thermal expansion and cold contraction and angular displacement possibly generated between an upper coupling and a lower coupling when the oil pipe is subjected to fastening operation in scenes such as an oil field site.

Description

technical field [0001] The invention relates to the technical field of thermal fluid and oil collection and transportation equipment, in particular to a special joint with sealing and connection structure for connecting pipelines. Background technique [0002] The commonly used traditional oil production method is rod pumping, that is, the steel tubing is connected by a joint, and the steel sucker rod is used to connect the oil pump at the bottom of the well. The temperature gradient at the bottom of the well is about 3°C ​​per 100 meters. In addition to the ground base temperature, the initial liquid temperature of an oil well with a length of 2000 meters is generally 60-80°C. [0003] Through the up and down movement of the sucker rod, the downhole liquid is lifted to the surface. During this process, due to the heat dissipation effect of the steel pipe, the temperature of the liquid in the pipe gradually drops, and the wax in the liquid gradually precipitates, which will ...

Claims

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Application Information

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IPC IPC(8): E21B17/02
CPCE21B17/02
Inventor 严为群曹征远陈广超
Owner 江苏联冠兆星石化科技有限公司
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