Special type oil well pipe with changed materials and structural layers at two ends and manufacturing method thereof

A technology of oil well pipes and structural layers, which is applied in the direction of drill pipes, casings, drilling equipment, etc., can solve the problems of reducing the service life of oil well pipes, partial wear of oil well pipe ends, and broken wells, so as to improve wear resistance and Corrosion resistance, improved corrosion resistance and wear resistance, and improved service life

Active Publication Date: 2011-09-07
梅河口市弘业无缝钢管有限公司
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  • Claims
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Problems solved by technology

[0006] The purpose of the present invention is to provide a special oil well pipe with changed materials and structural layers at both ends and its manufacture in order to solve

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  • Special type oil well pipe with changed materials and structural layers at two ends and manufacturing method thereof
  • Special type oil well pipe with changed materials and structural layers at two ends and manufacturing method thereof

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Embodiment Construction

[0024] see figure 1 As shown: the special oil well pipe of the present invention is welded with end pipe body 2 at both ends of oil well pipe body 1, the inner diameter of end pipe body 2 is the same as that of oil well pipe body 1, and the wall thickness of end pipe body 2 is larger than that of oil well The wall thickness of the pipe mother body 1, the outer surface of the end pipe body 2 are provided with threads, and the surfaces of the oil well pipe mother body 1 and the end pipe body 2 are formed with a composite nitride layer 3.

[0025] Both the end pipe body 2 and the oil well pipe body 1 are seamless steel pipes, the welding method between the end pipe body 2 and the oil well pipe body 1 is friction welding, the oil well pipe body 1 is J55, N80 steel grade, and the end pipe body 2 is made of steel The steel grade is higher than that of the oil well pipe parent body 1, and the material of the end pipe body 2 is CrMoAl alloy steel. The surface of the CrMoAl alloy steel...

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Abstract

The invention discloses a special type oil well pipe with changed materials and structural layers at two ends and manufacturing method thereof, and aims to solve the problems that the oil well pipe leaks and is broken in a well and the service life of the oil well pipe is reduced because the end part of the conventional oil well pipe is easy to abrade eccentrically. In the special type oil well pipe, end pipe bodies are welded at the two ends of an oil well pipe parent body; the inner diameter of each end pipe body is the same as that of the oil well pipe parent body; the wall of the each endpipe body is thicker than the wall of the oil well pipe parent body; and threads are formed on the outer surfaces of the end pipe bodies. The manufacturing method comprises the following steps of: (1) processing a threaded structure; (2) hardening and tempering; (3) performing nitriding treatment; (4) performing oxidation treatment; (5) welding the space between the oil pipe parent body and the end pipe bodies; (6) performing a hydrostatic test; and (7) performing flaw detection. The invention has the advantages that: cost is reduced; the oil well pipe cannot leak and cannot be broken in the well; and the service life of the oil well pipe is prolonged by more than 10 times.

Description

technical field [0001] The invention relates to a special oil well pipe and its manufacturing method, in particular to a special oil well pipe with changed materials and structural layers at both ends and its manufacturing method. Background technique [0002] At present, the corrosion, eccentric wear, and sticking of downhole oil well pipes in oil and gas fields are particularly serious, which are the three major problems that plague the service life of oil well pipes. High concentration, high content of sulfate-reducing bacteria (SRB), CO 2 In this corrosive environment, the downhole oil well pipe is easy to corrode, especially when working, the unique appearance of the sucker rod in the oil well pipe and the complex well conditions cause the two ends of the oil well pipe to appear Severe partial wear often presents the following problems: [0003] 1. The thread at the end of the oil well pipe is lost due to eccentric wear, which leads to a sharp drop in production and a...

Claims

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Application Information

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IPC IPC(8): E21B17/00E21B17/02
Inventor 吕学民
Owner 梅河口市弘业无缝钢管有限公司
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