Sandproof integrated compound screening pipe and processing method thereof

Abstract

The present invention relates to a sand-proof integrated composite screen pipe and its production method. Said method includes the following several steps: rolling up the sheet with flow-passing holes to obtain cylindrical form, welding and forming to obtain internal and external protective covers; then rolling up the sand-proof filter screen into cylindrical form, and placing the cylindrical filter screen into the above-mentioned external protective cover interior one-layer-by-one-layer, then placing the internal protective cover into the interior of external protective cover, expanding inner hole of internal protective cover to tightly press said several layers of sand-proof filter-screen so as to form integrated filter unit composite sleeve, then making said integrated filter unit composite sleeve be cover-mounted on the central base pipe with several flow-passing holes, using supporting disks to respectively weld two ends of said integrated filter unit composite sleeve and central base pipe so as to obtain the invented sand-proof integrated composite screen pipe.

Description

technical field [0001] The invention relates to a sand control device used in the technical field of oil well sand control, in particular to a sand control integrated composite screen and a processing method thereof. Background technique [0002] In the prior art, sand control composite screens and their processing methods are used in petroleum exploitation, and there are usually three types: [0003] 1. The first processing technology is: directly wrap several layers of metal filter screens on the central base pipe drilled with many flow holes, and protect the outer layer with protective tubes. The connections between each layer of metal filter screen tubes wrapped are With solder connection. This kind of sand control composite screen usually has the following disadvantages: (1) The welding between the edges of the metal filter screen is difficult and demanding, and the filter screen is often damaged during welding. (2) The thickness of the outerm...

AI Technical Summary

Problems solved by technology

This kind of sand control composite screen usually has the following disadvantages: (1) The welding between the edges of the metal filter screen is difficult and demanding, and the filter screen is often damaged during welding

(2) The thickness of the outermost protective sleeve rolled on the filter screen is large, and it is very difficult to roll

(3) In addition, because the filter screen is wrapped in layers, the support plate adopts a stepped structure, and the thickness of each step is very thin, which also brings great difficulty to the welding process of the support plate

(4) When the oil well pump is working, the metal filter is tightly attached to the screen under the action of external pressure, so that there is no gap between the metal filter and the central base pipe, which is easy to cause blockage of the screen and affects the seepage rate from the surface ;In the case of the metal filter screen being squeezed in, it is easy to break the metal filter screen, resulting in sand control failure

[0005] (1) The sand control filter is welded into a cylindrical shape, which has a certain degree of damage to the filter

(2) Each component is inserted one by one, so that there is a certain gap between each layer, which is easy to cause deformation of the filter due to pressure, and affect the filtration accuracy

This product usually has the following disadvantages: (1) low strength

(2) The operation is complicated, the cost is high, and the success rate of the operation is low

(3) The strength of the base pipe and the filter is low, and it is easy to be damaged

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