Novel self-expansion screen pipe

Abstract

The invention provides a novel self-expansion screen pipe, comprising a shape memory alloy slotted base pipe, a metal screen pipe, a water-soluble filler layer, a shape memory polymer layer and a water-soluble protective layer sequentially from inside to outside. The shape memory alloy slotted base pipe is made of shape memory alloy, contracts to a pre-expansion shape at high temperature and self-expands under temperature effect after being tripped in to a specified position; the shape memory polymer layer contracts to a pre-expansion state at high temperature and never changes in shape at normal temperature. Compared with the prior art, the novel self-expansion screen pipe has the advantages that the diameter is increased through the expansion pipe technology; multiple producing layers can be subjected to sand prevention treatment at a time; gravel filling is not required so that the influence of insufficient filling on sand prevention effect is avoided; fewer string trips-in are required so that operation cost is reduced; double filtration with the screen pipe and the shape memory polymer layer is achieved, improving the sand prevention effect; a well wall can be effectively supported so that wall collapse due to sand discharge is prevented.

Description

technical field [0001] The invention belongs to the technical field of oil and gas drilling and completion sand control, and in particular relates to a novel self-expanding screen pipe. Background technique [0002] In the current reservoir development process, the phenomenon of sand production in oil wells usually uses mechanical sand control—screen sand control. Generally, screen sand control needs to be filled with gravel to ensure the sand control effect. Due to the complex operation process of screen gravel packing, the cycle is long and the cost is high. At the same time, the increase of sand production in the formation near the wellbore cannot be changed as the mining continues. In response to this situation, the expansion screen was developed later to make the outer wall of the screen close to the well wall, which increased the diameter, reduced the gap between the screen and the well wall, and improved the increase in sand production. [0003] However, due to the ...

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Problems solved by technology

[0004] In view of this, the present invention aims to propose a new type of self-expanding screen to solve the current oil and gas well completion operations complex and high cost, poor sand control effect, etc., to realize the simplification of completion sand control operations of various oil wells and improve the sand control effect , the purpose of reducing costs

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