Skive Cut End Ring for Borehole Screen Assembly
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Solution Overview
Problem
Existing borehole screen end ring assemblies face challenges in accommodating variable base pipe and screen jacket diameters, requiring multiple ring designs and manual corrections, which increases manufacturing costs and complexity.
Innovation Solution
A single-piece end ring with a skive cut and radial section that adjusts by sliding angle-cut ends to fit over the screen jacket and base pipe, allowing for precise welding to achieve a sand-tight seal and reduced inventory needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple end ring designs are stocked to accommodate dimensional variations, then adaptability to different base pipe and screen jacket dimensions is improved, but device complexity and inventory requirements worsen
Solution Approach 1:
The end ring incorporates a skive cut that allows it to be dynamically adjusted to different dimensional requirements. The cut enables the end ring to be expanded or contracted to fit various base pipe and screen jacket combinations, replacing the need for multiple fixed-size rings in inventory.
Solution Approach 2:
The skive cut allows modification of the end ring's internal diameter parameter. By adjusting the degree of separation at the skive cut, the end ring can accommodate a range of dimensional variations in base pipe OD, wire dimensions, and rib penetration, effectively changing its fit parameters to match different assembly requirements.
2Manufacturing precision
If overlapping rings are machined for specific designs and shrink fitted, then manufacturing precision is improved, but ease of manufacture worsens due to additional machining and fitting operations
Solution Approach 1:
The skive cut is prepared in advance during manufacturing, allowing the end ring to be easily adjusted to the correct dimension during assembly. This preliminary preparation eliminates the need for complex on-site machining operations while still achieving precise fit requirements.
Solution Approach 2:
The skive cut design allows the end ring to be self-adjusted to the correct dimension by simply separating the cut edges to the appropriate degree. This eliminates the need for external machining equipment and skilled machinists, making the fitting process self-serviceable and much simpler.
3Reliability
If welding operations are performed on screen jacket, then reliability of connection is improved, but object-generated harmful factors worsen due to risks of screen gage opening
Solution Approach 1:
The end ring is separated from the screen jacket by design, with the skive cut providing a clear separation line. This segmentation allows welding to be performed on the end ring itself rather than on the screen jacket, eliminating the risk of damaging the screen gage openings while still achieving reliable connection through welding of the end ring to the base pipe.
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 solution simplifies the manufacturing process, reduces costs by enabling a snug fit with adjustable internal dimensions, and ensures a secure weld without manual corrections, enhancing the reliability of borehole screen assemblies.
Implementation Method 1
Relative sliding of angle cut ends along the skive cut gets the desired dimension of the inner diameter of the cylindrical component of the end ring over the screen jacket
Implementation Method 2
The radial section is attached to the base pipe with a second weld such that two welds complete the end assembly for the borehole screen
Data Source
AI summary
A method of assembling a borehole screen assembly includes placing a screen around a base pipe followed by an end ring having a skive cut to allow fitment with the screen by sliding along the skive cut. The assembly can be completed with welds.