Universal Wireline Standoff with External Fins for Cable Drag
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Solution Overview
Problem
Wireline cables and logging tools often become stuck in boreholes due to differential sticking, key-seating, and mechanical binding, which can lead to fishing jobs or lost tools, particularly in deviated or directional wells with permeable formations and varying mud properties.
Innovation Solution
A wireline assembly with wireline standoffs featuring cable inserts made of aluminum or silicon bronze, secured by opposing assemblies with external fins, reduces contact area and friction by minimizing direct contact with the borehole wall, enhancing jar performance and reducing sticking forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the wireline cable contacts the borehole wall directly, then the cable can be supported and positioned, but the cable friction and sticking forces increase
Solution Approach 1:
The patent introduces wireline standoffs as intermediary devices between the cable and borehole wall. These standoffs have cable inserts that contact the cable and opposing assemblies with external fins that contact the borehole wall, creating a mechanical mediator that transfers support forces while reducing direct cable-wall friction and sticking forces.
2Productivity
If the wireline cable operates like a saw, then the cable can cut through formations, but cable grooves are created that lead to sticking
Solution Approach 1:
The wireline standoffs act as intermediaries that distribute the mechanical interaction forces between the cable and formation. By providing opposing assemblies with external fins that contact the borehole wall, the standoffs prevent the cable from directly cutting grooves into the formation wall, thereby eliminating the harmful cable grooves while maintaining formation penetration capability.
3Adaptability or versatility
If the logging tool diameter is larger than the groove, then the tool can be deployed, but the key-seat terminates normal ascent
Solution Approach 1:
The wireline standoffs provide preliminary anti-action by preventing the formation of key-seats in the first place. By distributing contact forces through opposing assemblies with external fins, the standoffs prevent the cable from cutting grooves that would later interfere with tool ascent, thereby eliminating the retrieval problem before it occurs.
4Adaptability or versatility
If the wireline cable exerts sustained sideways pressure, then the cable can navigate deviated wells, but differential sticking occurs
Solution Approach 1:
The wireline standoffs serve as intermediaries that manage the sideways pressure forces in deviated wells. The opposing assemblies with external fins provide contact points that distribute the lateral forces, preventing the cable from exerting concentrated sustained pressure against the borehole wall that would cause differential sticking, while still enabling navigation through deviated well sections.
Data Source
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AI summary
A wireline standoff that may ameliorate the effects of wireline cable differential sticking, wireline cable key seating, and high cable drags by reducing or eliminating contact of the wireline cable with the borehole wall during the logging operation. An embodiment includes a wireline standoff. The wireline standoff may comprise a pair of opposing assemblies. The opposing assemblies may each comprise a half shell, a cable insert configured to be disposed in the half shell, and external fins coupled to the half shell. The wireline standoff may further comprise one or more fasteners configured to couple the opposing assemblies to one another.