Sand Control Screen Shroud Radial Extensions
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Solution Overview
Problem
Conventional sand control screen assemblies in wellbores suffer from erosion of the filter medium due to particle impingement, leading to increased maintenance costs and downtime, as current designs lack controlled radial spacing between the shroud and filter medium, causing localized flow concentration and deformation.
Innovation Solution
A sand control screen assembly with a radial extension or offset means that provides uniform radial spacing between the shroud and filter medium, using a perforated shroud or jacket with protrusions or radial extensions to disperse fluid flow and reduce erosion, and manufacturing methods that form protrusions on metal sheets to create these assemblies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the offset between shroud and filter medium is minimized to reduce space, then device complexity is reduced, but erosion of filter medium increases due to flow concentration
Solution Approach 1:
The patent introduces flow dispersion elements as intermediary components between the shroud and filter medium. These elements act as mediators that redistribute the fluid flow, preventing direct concentration of erosive particles against the filter medium while maintaining minimal overall spacing between components.
Solution Approach 2:
The patent applies local quality by creating zones of different flow characteristics at specific locations. Flow dispersion elements are positioned at critical areas where flow concentration occurs, locally modifying the flow pattern to reduce erosion without changing the overall device structure or increasing total space.
2Productivity
If shroud is made perforated to facilitate flow, then productivity is improved, but erosion of filter medium increases due to localized flow concentration
Solution Approach 1:
Flow dispersion elements serve as intermediaries between the perforated shroud and filter medium. They receive concentrated flow from shroud perforations and redistribute it into broader, less erosive flow patterns before reaching the filter medium, thus preserving productivity while reducing erosion.
Solution Approach 2:
The patent addresses flow concentration by introducing flow dispersion elements that operate in a different spatial dimension. Rather than modifying the shroud perforation pattern, the dispersion elements create additional flow paths in the annular space, distributing flow radially and reducing localized concentration.
3Manufacturing precision
If shroud spacing to filter medium is not controlled, then manufacturing precision requirements are reduced, but shroud deformation causes interface contact away from welds
Solution Approach 1:
The patent employs flow dispersion elements as a cushioning mechanism that is installed beforehand. These elements create a protective buffer zone between the shroud and filter medium, compensating for potential shroud deformation or radial movement by maintaining consistent spacing and preventing direct contact at vulnerable locations.
Data Source
AI summary
A sand control screen assembly having a protective shroud or jacket that provides a controlled offset between the shroud and a filter medium. The sand control screen assembly also includes a base pipe having a drainage layer positioned therearound for preventing the flow of particulate material of a predetermined size therethrough and allowing the flow of production fluids therethrough.