Liner Hanger Slip Axial Loading Design
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Solution Overview
Problem
Traditional slip designs for liner hangers experience limited load capacity due to radial reaction forces causing slip housing distortion, restricting the weight transfer from the liner string to the casing.
Innovation Solution
Modifying the slip design to change the loading orientation from radial to axial by broadening the slip end with undercuts, allowing axial loading onto the engaged slip, which reduces distortion and enhances load capacity without significant engineering changes, and incorporating axial flow channels for improved fluid flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional radial loading design is used, then the slip housing structure is simple, but the load capacity is limited due to radial reaction forces causing housing distortion
Solution Approach 1:
The patent inverts the traditional loading orientation from radial to axial. Instead of radial reaction forces acting on the slip housing, the design uses axial loading where the slip body contacts the top of the extended slip, transferring weight predominantly in the axial direction. This inversion eliminates the circumferential force distribution that caused housing distortion, thereby increasing load capacity without requiring complex housing revisions.
2Strength
If slip end is broadened with undercuts, then contact stress is reduced and load capacity increases, but manufacturing complexity increases
Solution Approach 1:
The patent applies local quality by broadening only the end portion of the slip where it contacts the slip body, while maintaining the original geometry of the main slip body. The undercut features are localized to the end region to reduce contact stress and promote fluid flow, without requiring complex manufacturing throughout the entire slip structure. This localized modification achieves enhanced load capacity with minimal impact on manufacturing complexity.
Data Source
AI summary
A liner hanger has slips held by a slip body. A potential energy force to move the slips axially when the hanger is in position is selectively released. The nature of the loading between the slips and the casing changes from a radial reaction force from the casing going into the slip and then distributed circumferentially to the slip housing to an essentially axial loading of the slip housing down onto the slip that has penetrated the casing with an opposite reaction force in the casing wall. The contact location between the slip housing and the slip is made broader at the slip end with a wider portion having an undercut to reduce contact stress and to aid in promoting flow past the set slip. The slip housing also has axial flow channels that interact with the undercut to promote flow past the set slips.