Composite Punched Sand Screen for High-Pressure Filtration
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Solution Overview
Problem
Existing sand screens fail to protect the underlying filtering structure from damage caused by high pressure differentials during installation and production operations, leading to reduced efficiency and physical damage.
Innovation Solution
A composite sand control screen comprising a cylindrical punched screen with a mesh layer and a perforated shroud, secured together through a swaging process to form a unitary cylindrical structure, enhancing mechanical strength and resistance to pressure differentials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a traditional wire wrap screen or punched screen is used, then the screen can be installed in the wellbore, but the screen is vulnerable to damage from high pressure differentials during installation and production operations
Solution Approach 1:
The patent applies composite materials by combining multiple screen layers (punched screen layer, woven screen layer, and knitted screen layer) with different structural properties. Each layer contributes unique characteristics: the punched screen provides rigid support, the woven screen offers flexibility and filtration, and the knitted screen adds elasticity. This composite structure collectively resists high pressure differentials while maintaining operational flexibility, resolving the contradiction between strength and device complexity.
Solution Approach 2:
The patent implements the nesting principle by arranging multiple screen layers concentrically, with each layer nested within or around the other layers. The punched screen forms the innermost layer, surrounded by the woven screen, which is in turn surrounded by the knitted screen. This nested configuration allows each layer to contribute to pressure resistance while maintaining a compact, integrated structure that does not significantly increase overall device complexity.
2Reliability
If the screen openings are made smaller to filter out more sand and particulate material, then filtration efficiency improves, but the screen becomes more susceptible to collapse and physical damage under high pressure
Solution Approach 1:
The patent uses composite materials with different layer configurations to simultaneously achieve fine filtration and structural strength. The punched screen layer provides rigid support against collapse, while the woven and knitted layers provide flexible filtration capabilities. This composite approach allows small openings for efficient sand filtration while the combined layer structure prevents screen collapse under high pressure, resolving the contradiction between filtration efficiency and resistance to collapse.
Solution Approach 2:
The patent applies local quality by assigning different functional characteristics to different layers of the composite screen. The punched screen layer is positioned where structural support is most needed to prevent collapse, while the woven and knitted layers are configured to provide filtration at various levels. This localized functional differentiation allows the screen to maintain small openings for efficient filtration while specific layers provide the necessary structural strength to prevent collapse.
3Strength
If a protective shroud is added over the screen to protect from physical damage, then mechanical protection improves, but the screen structure becomes more complex and harder to install
Solution Approach 1:
The patent merges the protective shroud function with the filtration function by integrating the shroud as part of the composite screen structure itself. The outermost knitted screen layer serves dual purposes: it provides mechanical protection against physical damage during installation and production, while simultaneously acting as a filtration layer. This merging eliminates the need for a separate protective shroud component, thereby maintaining installation ease while providing mechanical protection.
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 composite screen provides improved mechanical strength and resistance to collapse, bending, and bursting, maintaining effective filtration under high pressure conditions.
Implementation Method 1
The punched screen, the mesh layer, and the perforated shroud are swaged, or roll formed, to form a unitary, cylindrical composite screen structure
Data Source
AI summary
A composite sand control screen comprises at least three coaxially arranged layers, including a punched screen layer, at least one mesh layer, and a perforated shroud layer. The layers are secured together such as by means of a swaging process.