Foam Layer Well Screen for Sand Control and Erosion Resistance
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Solution Overview
Problem
Existing well screening techniques are inefficient in preventing the entry of unwanted solids like sand into tubing strings, particularly in non-uniform boreholes and high-sand production formations, leading to reduced production efficiency and component wear.
Innovation Solution
A downhole screen apparatus featuring a base pipe with a radially disposed foam layer containing hollow structures that allow fluid passage while minimizing solid passage, utilizing shape memory foam for improved filtration and deployment flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional screens are used for filtering formation fluid, then sand prevention is provided, but production efficiency is reduced and component wear increases
Solution Approach 1:
The patent applies porous foam material with controlled cell structures to create a filter screen that allows formation fluid to pass through while trapping sand particles. The porous structure provides effective filtration without restricting fluid flow, thereby maintaining production efficiency while preventing sand damage to downstream components.
Solution Approach 2:
The patent uses composite foam materials that combine different properties (porosity, elasticity, permeability) to create a screen that simultaneously achieves sand prevention and high fluid flow capability. The composite nature of the foam material allows optimization of both filtration and productivity parameters.
2Reliability
If screens are used in non-uniform boreholes, then formation fluid filtering is attempted, but screening efficiency falls short of expectations
Solution Approach 1:
The patent utilizes foam materials with variable parameters (cell size, porosity, density) that can be adjusted to match different borehole conditions and formation characteristics. This allows the screen to adapt to non-uniform boreholes while maintaining high screening efficiency through optimized material properties.
3Reliability
If gravel packed screens are used, then sand prevention is improved, but device complexity and installation difficulty increase
Solution Approach 1:
The patent extracts the gravel pack material from the screen structure itself, using foam material that inherently provides both structural support and filtration capability. This eliminates the need for separate gravel packing operations and simplifies the overall screen design while maintaining effective sand prevention.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides enhanced filtration efficiency, improved erosion resistance, and reduced sand shifting, maintaining high permeability even after sand penetration, with superior performance compared to conventional screens.
Implementation Method 1
a foam layer disposed radially outwardly of the base pipe and configured to allow the passage of formation fluid therethrough and minimize the passage of formation solids therethrough
Implementation Method 2
the foam layer including a plurality of hollow structures forming windows therebetween
Implementation Method 3
As compliant porous material a memory foam can be used embedding hollow spheres in a resin matrix
Data Source
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AI summary
An apparatus for screening earth formation components includes: a base pipe configured to allow the passage of formation fluid therethrough; and a foam layer disposed radially outwardly of the base pipe and configured to allow the passage of formation fluid therethrough and minimize the passage of formation solids therethrough, the foam layer including a plurality of hollow structures forming windows therebetween. A method of manufacturing an apparatus for screening earth formation components is also disclosed.