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Threaded connection structure

A threaded connection and external thread joint technology, applied in the direction of threaded connection, pipe/pipe joint/pipe fittings, machinery and equipment, etc., can solve the problems of insufficient use of threaded connection structure pipe body material, incomplete thread and other problems, to achieve easy failure, The effect of volume reduction and comprehensive performance improvement

Active Publication Date: 2013-02-27
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the problems of insufficient use of pipe body materials and incomplete threads in the threaded connection structure in the prior art, the embodiment of the present invention provides a threaded connection structure

Method used

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Embodiment Construction

[0025] In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0026] Such as figure 1 shown, see also figure 2 , a threaded connection structure described in the embodiment of the present invention is used for the connection of oil pipes or casings. The threaded connection structure includes an external threaded joint 1 and an internal threaded joint 2. The external thread and the internal thread are engaged to make the external thread The threaded joint 1 and the internal threaded joint 2 are assembled together, the external thread and the internal thread are buttressed threads, and both the external thread and the internal thread include a plurality of teeth and a plurality of tooth grooves, Each tooth includes a load-bearing surface, a tooth top, a guide surface and a tooth bottom. The heigh...

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Abstract

The invention discloses a threaded connection structure. Both the tooth-tip height of an external thread and the tooth-tip height of an internal thread engaged with the external thread are axially and linearly reduced to zero; the external thread and the internal thread, which are engaged with each other, are both entire threads; the taper of tooth-tip connecting line of the external thread is less than that listed in the API standard, and the taper of tooth-tip connecting line of the internal thread is less than that listed in the API standard; an internal thread envelope line and an external thread envelope line are intersected at the zero point of the tooth-tip height of an external thread; and the external thread and the internal thread, which are engaged with each other, are both positioned within the included angle formed by the internal thread envelope line and the external thread envelope line. The resistance to tension, compression, bending and torsion and the air tightness of the threaded connection structure are improved by setting both the external thread and the internal thread engaged with the external thread to be entire threads, without following the API standard. The pipe materials are fully utilized by reducing the tapers of tooth-tip connecting lines of the external and the internal threads, and the overall performance of threaded connection is greatly improved.

Description

technical field [0001] The invention relates to the fields of oil drilling, development and production, in particular to a threaded connection structure. Background technique [0002] API (AmericAn Petroleum Institute, American Petroleum Institute) round thread and API partial trapezoidal thread are widely used in the tubing and casing threads used in the petroleum industry. The taper of the middle diameter line of the partial trapezoidal thread casing with a range of 114.3-339.72mm is 0.0625mm / mm, while the taper of the middle diameter line of the partial trapezoidal thread casing with an outer diameter range of 406.4-508mm is 0.0833mm / mm, and the taper refers to X Twice the ratio of the length of the projection of the straight line on the Y-axis to the length of the projection of the X-axis on the Y plane. The threaded connection structure includes an external thread joint and an internal thread joint. There is an internal thread on the top, and the internal and external ...

Claims

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Application Information

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IPC IPC(8): E21B17/08F16L15/06
Inventor 潘志勇佘伟军宋生印赵新伟
Owner BC P INC CHINA NAT PETROLEUM CORP
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