Downhole Wheel Assembly Friction Reduction
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Solution Overview
Problem
Conventional downhole tools face challenges in navigating non-vertical wellbores due to increased friction and obstacles, such as washouts and uneven surfaces, which impede their movement and cause sticking or jamming, making it difficult to perform operations like testing, completion, and intervention.
Innovation Solution
The use of wheel assemblies detachably connected to downhole tools, featuring axles and wheels that reduce friction by rolling along the wellbore sidewalls, facilitated by fasteners that securely attach the wheel assemblies to the tool string, allowing for adjustable positioning and reduced friction during conveyance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional downhole tools are lowered into non-vertical wellbores using gravity, then the tools can be transported through vertical and near-vertical portions, but frictional forces resist movement in horizontal and deviated portions
Solution Approach 1:
A wheel assembly is introduced as an intermediary component between the tool string and the wellbore sidewall. The wheel assembly includes a wheel that contacts the sidewall and an axle that rotates with the tool string, allowing the tool string to roll along the sidewall rather than slide, thereby reducing frictional resistance in non-vertical wellbores.
2Productivity
If the tool string moves through non-vertical wellbores, then downhole operations can be performed, but obstacles such as washouts, sharp bends, and uneven surfaces impede movement
Solution Approach 1:
The wheel assembly acts as a mediator that bridges the gap between the tool string and the wellbore obstacles. The wheel contacts the sidewall and rotates, allowing the tool string to navigate around obstacles like washouts and sharp bends more easily, reducing the impeding effect of uneven surfaces on tool string movement.
3Adaptability or versatility
If the tool string is conveyed through non-vertical wellbores, then testing and completion operations can be performed, but the tool string may stick to or jam against the sidewall
Solution Approach 1:
The wheel assembly serves as a reliable intermediary that prevents direct contact between the tool string and the wellbore sidewall. By rolling the wheel along the sidewall, the tool string maintains separation from the wall, preventing sticking and jamming, thereby ensuring reliable conveyance through wellbores with various configurations including open-hole sections.
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 wheel assemblies effectively reduce friction and facilitate the conveyance of tool strings through non-vertical wellbores by allowing the tools to roll smoothly, overcoming obstacles and ensuring successful downhole operations.
Implementation Method 1
wheel assembly configured to detachably connect to a downhole tool to thereby reduce friction between the downhole tool and a sidewall of a wellbore
Data Source
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AI summary
A wheel assembly and a method for detachably connecting the wheel assembly to a downhole tool to reduce friction between the downhole tool and a sidewall of a wellbore through which the downhole tool is conveyed. The wheel assembly may include an axle configured to contact a sidewall of the downhole tool, a wheel rotatably connected with the axle, and a fastener configured to extend into the sidewall of the downhole tool to detachably connect the axle to the downhole tool.