Helical Groove Rope Socket for Downhole Tools
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Solution Overview
Problem
Existing methods for suspending downhole tools in wellbores often cause mechanical damage, kinks, and stress to the ropes, wires, or cables due to clamps and sheaves, leading to premature failure and costly recovery operations.
Innovation Solution
A low stress rope socket design featuring a core with a helical groove, a housing or resin coating to secure the rope, and transitions to align the rope with the socket's axis, reducing stress and mechanical damage by distributing the load and preventing kinks and bends.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If clamps or attachment mechanisms are used to suspend downhole tools from ropes, then the tools can be securely attached, but the rope, wire, line, or cable suffers mechanical damage, kinks, and stress
Solution Approach 1:
The patent introduces a rope socket as an intermediary component between the downhole tool and the rope. This socket features a helical groove that receives the rope and a sleeve that secures the rope in place, distributing the load along the rope's length rather than concentrating it at a single attachment point. This mediator design eliminates direct clamp-to-rope contact that causes mechanical damage and kinks.
Solution Approach 2:
The rope socket is divided into functional segments: a core with a helical groove for rope engagement, a sleeve for securing the rope, and a transition portion for alignment. This segmentation allows each component to perform its specific function optimally while collectively providing damage-free attachment. The helical groove itself is segmented into multiple windings that distribute stress along the rope.
2Strength
If clamps or attachment mechanisms are used to suspend downhole tools, then secure attachment is achieved, but kinks and bends occur in the rope
Solution Approach 1:
The patent employs a helical groove with a curved, spiral geometry that naturally guides the rope through a smooth path. This curved geometry prevents sharp bends and kinks by distributing the rope's path around a three-dimensional helical surface rather than through a flat, angular clamp structure. The transition portion also features curved surfaces to maintain smooth rope alignment.
3Ease of operation
If traditional attachment mechanisms are used, then downhole tools can be suspended, but stress concentrations lead to premature failure
Solution Approach 1:
The patent changes the geometric parameters of the attachment interface by introducing a helical groove with specific pitch and diameter ratios. This geometric parameter change transforms the stress distribution from concentrated to distributed. The helical geometry creates multiple contact points along the rope's length, reducing stress concentration and preventing premature failure while maintaining operational capability.
Data Source
AI summary
In accordance with some embodiments of the present disclosure, a low stress rope socket for a downhole tool is disclosed. The rope socket includes a core, a groove cut in a helix shape on the core, and a rope wrapped around the core and inserted in the groove. The slickline attachment affixed to an uphole end of the core to attach the rope to the core. Additionally, the rope socket includes a housing surrounding the rope and the core. The housing secures the rope to the groove. The rope socket further includes a transition affixed to a downhole end of the core. The transition aligns the rope with an axis of symmetry of the socket. A portion of the rope downhole from the rope socket carries no load.