Subterranean Screen Assembly Flat-Winding Method
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Solution Overview
Problem
Existing methods for assembling multi-layer shrouded screens face challenges in achieving a precise exterior dimension and often require omitting drainage layers to accommodate the assembly's passage through a die, leading to potential binding issues during deployment.
Innovation Solution
The method involves laying flat a filtering assembly with an outer shroud and an inner drainage layer, securing them together by welding or diffusion bonding, and then spirally winding the assembly into a cylindrical shape with seam closure, allowing for the base pipe to be inserted later or using a functional screen as a mandrel to reduce the assembly's outside diameter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the assembly is pulled through a die to obtain desired exterior dimension, then the exterior dimension is controlled, but drainage layers must be omitted to prevent binding
Solution Approach 1:
The patent applies preliminary action by forming the multi-layer assembly into a compressed饼状 (cake-like) form before insertion, which allows the assembly to be installed without pulling through a die. This pre-compression enables the assembly to fit within the available annular space while maintaining all drainage layers intact, eliminating the need to omit layers to achieve proper dimensioning.
2Reliability
If multiple drainage layers are included in the assembly, then filtering functionality is improved, but the assembly cannot pass through die without binding
Solution Approach 1:
The patent transforms the assembly into a compressed饼状 form as a preliminary step before installation. This pre-compression reduces the assembly's outer diameter to fit within the drift dimensions, allowing multiple drainage layers to be included while enabling smooth insertion without binding or requiring die passage.
Solution Approach 2:
The patent changes the dimensional state of the assembly by compressing it into a饼状 form with reduced outer diameter. This dimensional transformation allows the assembly to pass through restricted spaces (drift dimensions) while maintaining the full multi-layer structure with all drainage layers intact, thus preserving filtering functionality while enabling ease of installation.
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
This approach enables precise control over the exterior dimension of the screen assembly, eliminating the need to omit drainage layers and preventing binding during deployment, while maintaining the structural integrity and functionality of the screen.
Implementation Method 1
The inner drainage layer is secured and sealed to the outer shroud strip by welding or diffusion bonding
Implementation Method 2
The inner drainage layer is secured and sealed to the outer shroud strip by welding or diffusion bonding
Data Source
AI summary
A filtering assembly is laid flat on an outer shroud. An inner drainage layer is set over the filtering assembly while laid flat such that the inner drainage layer overlaps the filtering assembly. The inner drainage layer is sealed and secured to the outer shroud by diffusion bonding or welding while overlaying the filtering assembly. With the filtering assembly held firm between the inner drainage layer and the outer shroud a spiral winding procedure is commenced to roll the flat assembly into a cylindrical shape. The edges are sealed by welding or diffusion bonding. The spiral winding and seam closure can be done on a perforated base pipe or the base pipe can be inserted into the finished assembly at a later time and secured. Alternatively the filtering assembly and outer shroud, with or without the drainage layer can be wound over a perforated base pipe or a complete screen assembly.