Combined expansion screen

Abstract

The invention provides a combined expansion screen, which is provided with a base pipe, a memory plastic polymer and an elastic metal mesh sequentially from the inside to the outside; the base pipe is a hollow structure, and at least the area covered by the memory plastic polymer is provided with A plurality of slits or through holes for liquid to pass through; the memory plastic polymer is an expandable macromolecule material with pores for sand control, which can be compressed on the ground, and is preset when it goes down to the bottom of the well. The conditioned stimulus expands until it touches the well wall; the elastic metal mesh is used to protect the memory plastic polymer and support the well wall. The memory plastic polymer is SMP material. Part of the base pipe can directly adopt slotted screen or perforated pipe, and combine with the outer layer of memory plastic polymer with pores to form a double-layer sand control structure, which can have higher sand control effect during downhole use.

Description

technical field [0001] The invention relates to the field of petroleum excavation, in particular to a combined expansion screen. Background technique [0002] Sand production in oil layers is a common phenomenon in the process of reservoir mining, and mechanical sand control is the most widely used sand control technology; sand control screens play a vital role in mechanical sand control methods; in the use of sand control screens, In order to improve the sand control effect, gravel packing is generally required. Due to the complex operation process of screen gravel packing, the cycle is long and the cost is high. At the same time, it is easy to have deep filtration and the formation of sand cake layer in the annulus, which will cause screen blockage. Therefore, research A sand control device with good sand control effect and low cost has important technical and economic significance. After the expandable sand control screen developed by Weatherford is expanded, the outer w...

AI Technical Summary

Problems solved by technology

This solution also has the problem that the shape memory structure is easily damaged

Moreover, the excessive thickness of the elastic material is also likely to affect the flow efficiency, that is, the fluid flows through unnecessary filter paths, which increases energy consumption

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