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Method for processing sieve tube composite seam

A processing method and technology of screen tubes, which are applied in the field of mechanical processing, can solve the problems of high scrap rate and no composite joints of screen tubes, etc., and achieve the effect of improving strength and sand control effect

Active Publication Date: 2007-12-12
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

Even if the multi-axis linkage laser cutting method is used to process the trapezoidal seam, the above problems cannot be completely eradicated. The cutting cost of the trapezoidal seam is much higher than that of the rectangular one, and the scrap rate is much higher than that of the rectangular seam.
[0004] At present, there are no literature reports on the processing technology of screen composite joints at home and abroad.

Method used

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  • Method for processing sieve tube composite seam

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Embodiment Construction

[0013] See Figure 1. In the schematic diagram of the processing principle of the method for processing the composite seam of the screen pipe of the present invention, 1 is a controllable plasma power supply, which is mainly used to provide controllable plasma processing electric energy, which can be automatically adjusted according to the processing requirements and the change of the processing depth. For compound seams with narrow inner width, as the processing depth increases, the electric energy output by the controllable plasma power supply increases according to the preset law, so that the seam width can be expanded as required; 2 is the electromagnetic oscillation head, one is placed on each side of the seam, It is mainly used to generate an alternating electromagnetic field, so that the plasma is regularly deflected to both sides of the slit, and the width of the processed slit is enlarged as required; 3 is a sheet tool electrode, whose material is copper, and the positi...

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Abstract

The invention relates to oil sand control screen complex sealing. The sheet tool electrode and the oil pipe connect with the positive and negative side of the controllable plasma, using discharged micro fine plasma high temperature etching for machining. Through the controlling of plasma energy and strength and frequency of the oscillating electromagnetic field, allowing the energy changing based on the preset rules, two sides of the plasma post generating regular reciprocating oscillation to realize the sealing machining. It can cut complex seal with outside narrow and inside wide one, featuring in high machining precision and low in cost.

Description

technical field [0001] The invention belongs to the field of mechanical processing, and relates to a processing method for composite joints of petroleum sand control screen pipes (referring to joints whose width increases from the outside of the pipe to the inside of the pipe according to a multi-level linear or nonlinear relationship). Background technique [0002] Slotted screen is currently the most widely used sand control tool in oilfields at home and abroad. It has the advantages of simple structure, low cost, small flow resistance and high strength. It can be used in vertical wells, inclined wells, branch wells, horizontal wells, Sand control of oil wells such as sidetracking wells. [0003] At present, there are two commonly used screen processing methods at home and abroad: mechanical cutting and laser cutting. The mechanical cutting method is mainly used for cutting rectangular seams with a seam width greater than 0.4mm (referring to seams with the same seam width...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23H7/38B23H7/14B23H9/14B23K10/00
Inventor 刘永红谢慧华曹泽甫田相元李庆云李小朋纪仁杰
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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