Filtering material for oil well sand preventing screen pipe and method for making same

Abstract

The invention relates to a filter material for an oil well anti-sand sieve tube, which is made by the following method that: one or a plurality of sets of monolayer wires with the diameter of 0.05 mm to 0.20 mm in parallel arrangement are respectively pressed into small triangular waveform by a primary compression roller; the compression roller teeth have a triangular shape; the top angle of the teeth is 60 degrees to 120 degrees; the modulus of the teeth is between 0.5 and 1.0; a set of wires pressed into the small triangular waveform are sent to a secondary compression roller or the plurality of sets of wires pressed into the small triangular waveform are stacked and combined according to layers and sent to the secondary compression roller; the modulus of the secondary compression roller is 2.0 to 3.0; after passing through the secondary compression roller, the wires are directly sent to a planished compression roller and the filter material for the oil well anti-sand sieve tube is obtained. The filter material for the oil well anti-sand sieve tube made has uniform linear density, regular shape and uniform size of holes, high pollutant receiving capacity and anti-clogging capacity; and effective pollutant receiving holes can reach above 80 percent of total holes. When the anti-sand sieve tube is made, the filter material can realize automatic winding while metal cotton can not achieve the point.

Description

technical field [0001] The invention relates to a filter material for an oil well sand control screen and a preparation method thereof. Background technique [0002] At present, the sand control screens used in oil wells mainly include the following types: [0003] 1. Slotted liner: It is formed by cutting many slits in a certain order on the casing or tubing, and the opening area (or flow area) is generally only 1% to 3%. Slotted liners are often used in reservoirs with high cementation strength and little sand production. The main purpose is to prevent borehole wall collapse, so they are called liners. [0004] 2. Wire-wound screen: mainly composed of base pipe and screen sleeve (JACKET), with a flow area of ​​15% to 30%, and can be used in various lithologic reservoirs. When the clastic rock reservoir with low cementation strength and easy sand production is used alone (without gravel packing), there is a serious plugging problem. Therefore, this kind of screen is usua...

AI Technical Summary

Problems solved by technology

A large number of tests have shown that small pores (less than the median d50 of reservoir sand particle size) and large pores (more than three times d50) in metal wool are not good for dirt holding, that is to say, small pores do not have dirt holding capacity (sand particles cannot enter Small pores), large pores will make dirt holding invalid (cannot suspend sand particles)

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