An expandable sand control screen

Abstract

The invention discloses an expandable anti-sand sieve tube. The expandable anti-sand sieve tube comprises an expandable sealing female buckle, an expandable sieve tube main body and an expandable sealing male buckle. The expandable sealing female buckle and the expandable sealing male buckle are connected to the upper end and the lower end of the expandable sieve tube main body in an inserted welded mode correspondingly; and the expandable sealing female buckle is divided into a Z-shaped expandable female thread assembly and an expandable female thread seat, the expandable sieve tube main body is composed of an expandable base tube, a twisted type precise anti-sand sieve and an expandable outer protective shell, and the expandable sealing male buckle is divided into a Z-shaped expandable male thread assembly and an expandable male thread seat. During working, through diameter and cone expanding and mechanical force, radial expansion deformation occurs to the high-property expandable sieve tube, the drift diameter in the sieve tube main body and the overflowing area are increased while radial deformation occurs, expandable threads are expanded and then a metal stitching seal is built, and the anti-sand property and connecting strength are ensured.

Description

technical field [0001] The invention relates to a sand control screen, especially an expandable sand control screen, which is mainly used in sand control completion operations of various well types such as vertical wells, directional wells, and horizontal wells. Background technique [0002] At present, the common sand control screens in China include wire-wound screens, slotted screens and composite screens. They each have their own characteristics. The wire-wound screens are composed of a perforated base pipe and a flow medium layer, and the flow medium has a controllable width. The wedge-shaped metal wire is wound on the reinforcing rib. The thickness of the medium layer of the screen tube with this structure affects the inner diameter of the screen tube, which is not conducive to subsequent operations, and it is easy to have messy wires during the running and production process, which affects the barrier. Sand precision; the slotted screen is a single-layer screen with c...

AI Technical Summary

Problems solved by technology

[0002] At present, the common sand control screens in China include wire-wound screens, slotted screens and composite screens. They have their own characteristics. The wire-wrapped screens are composed of a perforated base pipe and a flow medium layer. The wedge-shaped metal wire is wound on the reinforcing rib. The thickness of the medium layer of the screen tube with this structure affects the inner diameter of the screen tube, which is not conducive to subsequent operations, and it is easy to have messy wires during the running and production process, which affects the barrier. Sand precision; the slotted screen is a single-layer structure screen with controllable width slots cut on the casing. Due to the influence of slot density, the flow capacity of this kind of screen is low; the composite screen is a three-layer structure screen composed of a perforated base pipe, a precision flow medium layer and an outer shell. Or the precision flowing medium layer composed of sieve cotton, its sand control accuracy is the highest among the commonly used screens at present, but it also has the problem that the thickness of the flowing medium layer affects the inner diameter like the wire wound screen

In addition, there is a common problem in all types of screens commonly used at present: as the production time goes by, sand layers will accumulate in the annular space between the screen and the well wall, which will increase the production pressure difference and affect the production rate. bottom water coning

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