Mouse cage type V-shaped straight wire sieve tube

Abstract

The invention provides a mouse cage type V-shaped straight wire sieve tube, which is used for sand prevention of oil and gas wells and coal bed gas wells, in particular has functions of adjusting speed of well fluid and self-cleaning. The sieve tube consists of a sieve tube coupling, a matrix, ring ribs, upper and lower hoops and a straight wire sieve tube sleeve; a variable cross-section channelin the middle of the matrix realizes primary adjustment of the flow velocity of the well fluid; a variable cross-section step rotating body channel inside the sieve tube coupling can reduce stress concentration and realize secondary adjustment of the flow velocity of the well fluid; a gap formed between adjacent layers of ring ribs is trapezoidal, particles can be prevented from being gathered inthe gap, and the sieve tube has self-flushing function; screen cut formed between adjacent straight wires is trapezoidal, the particles can be prevented from being blocked in the gap, the sieve tube has the function of self-cleaning the screen cut, and stainless steel straight wires can effectively solve the problems that salvage is difficult to carry out and wound wire is easy to fall off; an outer ring surface of the straight wire sieve tube sleeve is V-shaped, that large particles are timely deposited to the bottom of the well can be guaranteed, and the sieve tube has the function of self-cleaning the straight wires; moreover, the flow area of the well fluid passing through the screen cut can be effectively enlarged, and the probability of collision between the straight wires and the inner wall of the sleeve is reduced.

Description

technical field [0001] The invention relates to a downhole mechanical sand control device in oil and gas well exploitation and coal bed gas well drainage, in particular to a straight wire screen with the functions of sand filtering, coal dust filtering, well fluid velocity adjustment and self-cleaning functions. Background technique [0002] Unconsolidated sandstone oil and gas reservoirs are widely distributed in my country and other countries in the world, and sand production from oil and gas wells has become one of the main factors that hinder the development of unconsolidated sandstone oil and gas reservoirs. In addition, coal seams have large plastic deformation, brittle coal quality, and strong reservoir heterogeneity. , resulting in a serious coal bed methane well output coal powder problem, oil and gas wells sand and coal bed methane wells out of coal powder will cause well wall collapse and damage the casing, and cause serious corrosion and wear of wellbore lifting eq...

AI Technical Summary

Problems solved by technology

[0003] In order to effectively solve the problem of sand production in oil and gas wells and coal bed gas wells and overcome the shortcomings of existing mechanical sand filter tube sand control technology, the purpose of this invention is to provide a squirrel-cage V-shaped straight filter suitable for sand control in oil and gas wells and coal bed gas wells. Silk screen

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