Wireline Roller Standoff for Non-Vertical Wellbore Conveyance
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Solution Overview
Problem
Drilling and downhole operations in complex and harsh environments often result in equipment becoming stuck, lost, or damaged due to cable abrasion and entrapment against non-vertical wellbore sidewalls, leading to increased work times and costs.
Innovation Solution
A standoff apparatus with rolling elements and a gripper system is introduced to keep the cable away from the wellbore sidewall, allowing it to roll and rotate, reducing friction and preventing entrapment by engaging with the sidewall through ridges, slots, and protrusions, thereby facilitating smooth conveyance of downhole tools in non-vertical wells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the cable is used in non-vertical wellbores, then the ability to access complex formations is improved, but the cable becomes entangled and damaged against sidewalls
Solution Approach 1:
A wireline roller standoff apparatus is introduced as an intermediary device between the cable and the wellbore sidewall. The roller assembly with multiple rollers supports the cable and prevents direct contact with the sidewall, eliminating abrasion and entanglement while enabling safe operation in non-vertical wellbores
Solution Approach 2:
The standoff apparatus extends radially outward from the cable in the lateral dimension, creating a clearance zone between the cable and sidewall. This dimensional extension prevents the cable from contacting the sidewall during conveyance in deviated and horizontal wellbores
2Force
If the cable contacts the wellbore sidewall, then support is provided, but friction and abrasion increase causing damage
Solution Approach 1:
The static friction-based cable support is replaced with a rolling mechanical system. The wireline roller standoff uses rollers that rotate as the cable moves through them, substituting sliding friction with rolling friction, which significantly reduces wear and allows smooth cable conveyance
Solution Approach 2:
The standoff apparatus transitions from a static support structure to a dynamic rolling system. The rollers are free to rotate, allowing the apparatus to adapt dynamically to cable movement and wellbore geometry, reducing friction through continuous rolling motion
3Reliability
If the cable is constrained to prevent sidewall contact, then abrasion is reduced, but device complexity increases
Solution Approach 1:
The standoff apparatus is segmented into multiple independent rollers that can rotate individually. This segmentation allows each roller to handle cable support independently, simplifying the overall design while providing effective protection through distributed rolling contact
Solution Approach 2:
The wireline roller standoff apparatus serves multiple functions: it supports the cable, prevents sidewall contact, reduces friction through rolling, and accommodates various wellbore geometries. This multi-functionality reduces the need for additional protective devices, offsetting the complexity of the standalone apparatus
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
The solution effectively reduces the likelihood of cable entrapment and abrasion, enhancing the reliability and efficiency of downhole operations by maintaining cable clearance from the wellbore sidewall, thus minimizing equipment damage and operational costs.
Implementation Method 1
A standoff apparatus with rolling elements and a gripper system is introduced to keep the cable away from the wellbore sidewall, allowing it to roll and rotate, reducing friction and preventing entrapment
Data Source
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AI summary
Apparatus comprising a gripper (330) operable to grip a cable (40) extending between the Earth's surface and a downhole tool, wherein the downhole tool is suspended in a wellbore that extends from the Earth's surface to one or more subterranean formations. A body (310) is assembled to the gripper (330). A plurality of rolling elements (320) are each rotatably coupled to the body (310) and operable to rotate relative to the body in response to contact with a sidewall of the wellbore as the body (310) is translated along the wellbore. The body (310) and the plurality of rolling elements (320) collectively rotate relative to the gripper (330) and, thus, the cable (40).