Sacrificial Shroud for Screen Erosion Control
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Solution Overview
Problem
The existing screen assemblies in well completion operations suffer from accelerated erosion near the inflow control device, leading to premature failure and debris entry due to varying fluid velocities along the screen length.
Innovation Solution
A sacrificial screen shroud is used, composed of a material with a higher erosion rate than the screen, positioned to cover the high-velocity areas, which erodes faster and redirects the erosion hotspot along the screen length, thereby distributing the erosion risk and delaying failure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a screen assembly is used to filter produced fluid, then debris entry is prevented, but accelerated erosion occurs at high-velocity areas causing premature screen failure
Solution Approach 1:
A sacrificial shroud made of erodible material (such as cement or soluble polymer) is positioned over the screen at high-velocity areas. This shroud is designed to erode preferentially, sacrificing itself to protect the screen. As the shroud erodes over time, it gradually exposes more of the screen surface, distributing the erosion damage across the shroud material rather than the screen, thereby extending the screen's service life.
Solution Approach 2:
The sacrificial shroud acts as an intermediary layer between the erosive produced fluid and the screen. This intermediate layer absorbs the erosive impact, allowing the fluid to erode the shroud material instead of directly attacking the screen. The shroud serves as a protective mediator that can be replaced or sacrificed without compromising the screen integrity.
2Productivity
If fluid velocity increases near the inflow control device, then flow regulation is improved, but erosion rate at that location is accelerated
Solution Approach 1:
The sacrificial shroud is selectively positioned at specific high-velocity areas of the screen, particularly near the inflow control device where erosion is most severe. This localized application provides targeted protection only where needed, allowing high flow rates to be maintained while concentrating the erosive damage on the shroud material in specific critical zones rather than uniformly across the entire screen.
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 sacrificial shroud effectively extends the life of the screen by redistributing the erosion hotspot, reducing the risk of debris entry and maintaining efficient fluid control, thus prolonging the screen's operational life and preventing premature failure.
Implementation Method 1
the velocity at which the produced fluid passes through the screen varies along the length of the screen... erosion at this portion of the screen is accelerated compared to portions of the screen located farther away from the ICD
Data Source
AI summary
A method and apparatus including a screen assembly that includes a screen having a plurality of openings and a sacrificial shroud disposed over a portion of the openings and disposed to erode under flow of formation fluid through the screen. The shroud is configured to erode more quickly than the screen over which it is disposed, thereby altering the erosion zone of the screen over time and prolonging the life of the screen.