Sand Control Screen Erosion-Resistant Perforations
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Solution Overview
Problem
Sand control screen assemblies in hydrocarbon production often suffer from 'dead spaces' that prevent fluid flow, leading to poor gravel packs and exposure of sand screens to erosion, which can damage the equipment and reduce their effectiveness.
Innovation Solution
Incorporating erosion-resistant flow paths through dead spaces in sand control screen assemblies by creating perforations with sizes equal to or smaller than the screen gauge, allowing fluid leakage and mitigating erosion with materials like tungsten carbide in a nickel matrix.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If dead spaces are present in sand control screen assemblies, then handling and connection operations are facilitated, but fluid flow is blocked and sand screens become exposed to erosion
Solution Approach 1:
The patent applies local quality by providing erosion-resistant material specifically at the perforations located in dead spaces, while the rest of the sand screen maintains its original structure. This targeted application protects vulnerable areas without altering the overall screen design or handling characteristics.
Solution Approach 2:
The erosion-resistant material is applied to perforations in dead spaces before the sand control screen assembly is installed in the wellbore. This preliminary protection ensures that when fluid flow begins, the vulnerable perforations are already protected against erosion, preventing future damage to the sand screen.
2Productivity
If perforations are added to dead spaces, then fluid flow through dead spaces is enabled, but the structure becomes more complex
Solution Approach 1:
The patent segments the dead space region by adding discrete perforations at specific locations along the base pipe. This segmentation allows fluid to bypass dead spaces in a controlled manner, enabling flow through previously blocked areas without requiring a complete redesign of the entire screen assembly structure.
Solution Approach 2:
The patent creates a porous flow path through the dead space by adding perforations to the base pipe. These perforations allow fluid to leak through the dead space region, effectively converting a solid blocking structure into a porous medium that permits controlled fluid passage while maintaining structural integrity.
3Reliability
If erosion-resistant material is deposited at perforations, then erosion protection is provided, but manufacturing complexity increases
Solution Approach 1:
The patent applies composite materials by depositing erosion-resistant material (such as tungsten carbide, stellite, or other hardfacing materials) onto the base pipe at the perforation locations. This creates a composite structure where the erosion-resistant coating is bonded to the base pipe, providing enhanced protection at the most vulnerable points without requiring the entire assembly to be made from expensive erosion-resistant material.
Solution Approach 2:
The erosion-resistant material is applied locally only at the perforations in dead spaces rather than uniformly across the entire sand screen assembly. This targeted approach provides maximum erosion protection where it is most needed while minimizing the amount of expensive material required and reducing manufacturing complexity compared to full-assembly coating.
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 ensures effective fluid communication through dead spaces, preventing erosion and maintaining the integrity of the sand control screen assemblies during gravel packing and production operations, thereby enhancing sand control and reducing maintenance costs.
Implementation Method 1
mitigating erosion with materials like tungsten carbide in a nickel matrix
Data Source
AI summary
A sand control screen assembly includes a base pipe having an interior and defining one or more flow ports. At least one sand screen is arranged about the exterior of the base pipe and has a predetermined screen gauge. At least one dead space is axially offset from the at least one sand screen and comprises at least one of an axial length of the base pipe and a shroud arranged about an exterior of the base pipe and extending axially from the at least one sand screen. One or more perforations are provided at the at least one dead space and are defined through at least one of the axial length of the base pipe and the shroud. Each perforation defines an opening and an erosion-resistant material deposited at the opening. A size of the opening is equal to or smaller than the predetermined screen gauge.