Combined type sieve tube

Abstract

The invention relates to a combined type sieve tube aiming to overcome the defects of easy blockage of antiparallelogram gaps, poor self-cleaning capability, low pressure-bearing capacity and easily extruded damage of the traditional sand prevention sieve tubes. In the invention, the wall of a base tube is provided with an overflowing hole, and sieve blades are fixedly arranged on the outer circumference of the base tube; one end of an inner hole of each sieve blade is a straight hole, while the other end is a taper hole which is small inside and big outside; the end surface at one end of each sieve blade straight hole is a plane, while the other end surface is uniformly distributed with three or more lug bosses; the wall of the inner hole of each sieve blade is provided with an axial liquid flow trough; the excircle of the base tube is axially provided with a key; the part of the base tube, with a key, is sequentially provided with a gland, a plurality of sieve blades and a gland, and the glands are fixedly connected with the base tube; and the sieve blades are sequentially arrayed in the same direction. The sieve tube has the advantages of reasonable structure, easiness for processing and manufacturing, large seepage area, high sand blocking precision, good anti-blockage effect, high pressure bearing strength and long service life and can be used for extracting liquid with a large discharge quantity and pumping out dust sand to increase the liquidity of liquid, thereby prolonging the extraction life of an oil well and reducing the production cost of oil extraction.

Description

Technical field [0001] The invention relates to a mechanical sand control device for petroleum development, in particular to a combined screen pipe. Background technique [0002] In oil exploration and development well completion operations, most sand control wells are mechanically controlled. Sand control pipes mainly include slotted screens, wire-wrapped screens, metal wool sand filter pipes, metal mesh screens and pre-packed screens. In addition to slotted screens, other sand control screens are generally welded to the base pipe, the processing technology is complicated, the pores of the sand filter are unstable, and it is easy to be punctured by repeated pumping liquid; easy to block, It cannot be cleaned and has a short service life. The slotted screen pipe is machined with axial or radial slots on the pipe body. The pressure bearing strength of the pipe body is reduced, and the poor corrosion resistance leads to deformation of the slots. It is easy to block during san...

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the shortcomings of the existing sand control screens that the equilateral trapezoidal gaps are not wear-resistant, the gaps are easy to widen under the erosion of liquid flow, the pressure bearing capacity is low, and the filter body is easily crushed when the well wall collapses. The invention provides a A combined screen, the combined screen improves the strength and self-cleaning ability of the screen by changing the shape of the gap, the screen is not easy to be blocked, not easy to be damaged, and reduces the oil production construction work in the later stage of the oil well, especially suitable for sand control in horizontal well completion

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