Expandable Reamer Ringout Detection Using WOB Ratio Changes
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Solution Overview
Problem
Existing expandable downhole tools experience wear, making it difficult to detect when they become ineffective at expanding wellbores, leading to costly and time-consuming drilling operations due to unknown wear locations and depths.
Innovation Solution
A ringout detection system using sensors to measure weight-on-bit (WOB), torque, and rate of penetration (ROP) to identify changes indicative of wear in expandable tools, such as reamers, by detecting increases in weight-on-reamer and decreases in torque and ROP, allowing for timely intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If expandable downhole tools are used to expand wellbore diameter, then drilling effectiveness is improved, but tool wear occurs making detection difficult
Solution Approach 1:
The system continuously monitors drilling parameters (WOB, torque, ROP) and provides real-time feedback about tool condition. When wear is detected through parameter changes, the system alerts operators to take corrective action, creating a closed-loop monitoring system that enables timely detection of tool degradation without requiring direct measurement of the tool itself.
Solution Approach 2:
Instead of directly measuring tool wear, the system uses intermediary parameters (weight-on-bit, torque, rate of penetration) that change in response to wear. These measurable drilling parameters serve as proxies or mediators that indirectly indicate tool condition, allowing wear detection through easily measurable quantities rather than direct tool inspection.
2Duration of action of moving object
If drilling operations continue without wear detection, then operational time is maintained, but costly delays occur from unknown wear locations
Solution Approach 1:
The system performs preliminary detection of wear conditions before they lead to complete tool failure or significant operational problems. By continuously monitoring drilling parameters and identifying early signs of wear, the system enables proactive intervention, allowing operators to address wear issues before they cause costly delays or require non-planned operations.
3Measurement precision
If multiple sensors are deployed to detect wear, then detection accuracy is improved, but system complexity increases
Solution Approach 1:
The system uses multiple sensors that measure different drilling parameters (WOB, torque, ROP), but these sensors serve a universal purpose: detecting tool wear through various aspects of drilling performance. Each sensor provides a different perspective on tool condition, and together they create a comprehensive monitoring system that detects wear through multiple independent indicators, improving reliability without requiring specialized wear measurement equipment.
Data Source
AI summary
A ringout detection system may receive a plurality of surface weight-on-bit (SWOB) measurements from a surface weight-on-bit (WOB) sensor and a plurality of downhole weight-on-bit (DWOB) measurements from a downhole WOB sensor. A ringout detection system may identify a decrease in a WOB ratio between the plurality of SWOB measurements and the plurality of DWOB measurements. A ringout detection system may determine that the decrease in the WOB ratio exceeds a WOB ratio threshold. A ringout detection system may identify that ringout has occurred at the reamer based at least in part on the decrease in the WOB ratio.