Downhole Cable Sensor Torque Monitoring
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Solution Overview
Problem
In the drilling of complex wellbore structures such as multi-laterals and horizontal wells, existing technologies fail to effectively monitor and manage cable torque during conveyance operations, leading to increased risk of cable damage and failure, despite advancements in tools like tractors and high-strength cables.
Innovation Solution
The implementation of a downhole tool equipped with a sensor, such as a strain gauge with a Wheatstone bridge arrangement, to measure relative torque between the cable and the tool in real-time, allowing for continuous monitoring and alerting operators to potential cable failure thresholds, thereby reducing maintenance costs and preventing damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If real-time torque monitoring is implemented using strain gauges and Wheatstone bridge arrangements, then cable reliability and operational safety are improved, but device complexity and measurement system requirements increase
Solution Approach 1:
The patent replaces direct mechanical torque measurement mechanisms with an electrical sensing system using strain gauges arranged in a Wheatstone bridge configuration. This substitution allows for more precise torque monitoring while reducing mechanical complexity in the torque sensing mechanism itself.
Solution Approach 2:
The patent introduces strain gauges as intermediary elements that indirectly measure torque through strain detection. These gauges convert mechanical strain into electrical signals that can be processed and analyzed, providing a bridge between mechanical torque and measurable electrical parameters.
2Measurement precision
If strain gauges with Wheatstone bridge arrangement are used for torque measurement, then measurement precision is improved, but device complexity and manufacturing requirements increase
Solution Approach 1:
The patent employs electrical measurement systems (strain gauges and Wheatstone bridges) to replace less precise mechanical torque measurement methods. This enables high-precision torque monitoring through electrical signal processing while maintaining the essential mechanical function of torque transmission.
Solution Approach 2:
The patent utilizes the electrical resistance parameter of strain gauges, which changes in response to mechanical strain. By monitoring resistance changes through the Wheatstone bridge configuration, the system achieves precise torque measurement through parameter transformation from mechanical to electrical domain.
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
Real-time torque measurement enables operators to adjust operations, reduce excessive de-torquing trips, and extend cable lifespan by identifying and mitigating excessive torque levels, thereby enhancing cable reliability and reducing maintenance needs.
Implementation Method 1
a sensor, such as a strain gauge with a Wheatstone bridge arrangement, to measure relative torque between the cable and the tool
Implementation Method 2
a sensor, such as a strain gauge with a Wheatstone bridge arrangement, to measure relative torque between the cable and the tool
Data Source
AI summary
A method and apparatus for evaluating the subterranean formation of a wellbore includes conveying a downhole tool in a wellbore via a cable, and determining the torque in the cable in real-time. The method further involves conveying the downhole tool on a wireline, and automatically triggering an alert when the torque reaches a certain level. The apparatus includes a cable, a downhole tool attached to the cable for conveyance within the wellbore, and a sensor to measure torque in the cable. The apparatus may also include a telemetry system to communicate the torque data to the surface. The downhole tool includes a sensor to measure the relative torque between the downhole tool and the cable in real time.