Real-Time Drill Rig ROP Sensing for Bit Wear Monitoring
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Solution Overview
Problem
Existing methods for measuring the rate of penetration (ROP) during drilling operations are unreliable, providing only overall averages and failing to account for variations due to different operators or rock strata, leading to inaccurate assessments of drill bit wear and potential premature failure.
Innovation Solution
A system and method utilizing sensors, including atmospheric pressure sensors and accelerometers, to measure and monitor ROP in real-time, allowing for precise control of drilling parameters such as weight on bit, torque, and RPM, with automatic alerts for bit changeovers based on threshold detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual calculation methods are used to determine ROP, then the system complexity is low, but the measurement precision and reliability are insufficient
Solution Approach 1:
The patent replaces manual calculation methods with automated sensor-based measurement systems. Specifically, it uses draw cable transducers with rotary wheels that mechanically track cable displacement and convert it to angular measurements, which are then processed by controllers to calculate ROP automatically. This substitution of manual mechanical operations with automated sensor-transducer-controller systems resolves the contradiction by providing precise measurements without requiring complex human intervention.
Solution Approach 2:
The patent introduces intermediary devices between the drill bit and the measurement system. The draw cable acts as an intermediary that translates drill bit advancement into measurable cable displacement. The rotary transducer wheel serves as another intermediary that converts linear cable movement into rotational angular measurements. These intermediaries enable precise ROP measurement while keeping the overall system architecture manageable and modular.
2Loss of information
If overall average ROP is used, then the ease of operation is high, but the loss of information regarding variance and drill bit wear is significant
Solution Approach 1:
The patent segments the continuous drilling process into measurable intervals using automated sensors. The draw cable transducer continuously records cable displacement over time, creating segmented data points that represent ROP at different stages of drilling. The controller processes these segmented measurements to generate time-stamped ROP data, variance statistics, and drill bit wear indicators. This segmentation allows detailed analysis of ROP variations without overwhelming operational complexity, as the system automatically handles data collection and analysis.
Solution Approach 2:
The patent implements feedback mechanisms where the measured ROP data and its variance are fed back to operators and control systems. The system continuously monitors ROP measurements and provides feedback on drill bit performance, enabling operators to detect wear trends and adjust drilling parameters. This feedback loop preserves information about ROP variance and bit condition while maintaining ease of operation through automated monitoring and alerting systems.
3Productivity
If real-time ROP monitoring is implemented, then the productivity is improved, but the use of energy and device complexity increase
Solution Approach 1:
The patent employs self-service measurement mechanisms where the drilling operation itself generates the measurement signals. The draw cable is naturally displaced by drill bit advancement, requiring no additional power source for measurement. The rotary transducer wheel is passively driven by cable tension and movement, converting mechanical energy already present in the drilling system into measurable angular displacement. This self-service approach enables real-time ROP monitoring with minimal additional energy consumption, as the system utilizes the inherent mechanical energy of the drilling process.
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
Provides accurate, real-time ROP data for optimizing drilling performance, reducing drill bit wear, and preventing premature failure by adjusting drilling parameters, thus enhancing productivity and cost-effectiveness.
Implementation Method 1
A sensor, such as an atmospheric pressure sensor, can be used to determine a position of the drilling assembly
Implementation Method 2
A sensor, such as an atmospheric pressure sensor, can be used to determine a position of the drilling assembly. Other sensors that can be used include, but are not limited to, accelerometers
Data Source
AI summary
Rate of penetration (ROP) measurement system (10) has sensor apparatus on a drill rig detecting drilling advancement. Sender (38, 200) transmits to a receiver (40, 204), optionally via a reflector (39, 208). An electronic sub (201) can include the sender (200), receiver (204) or reflector (208). Reflector (39, 208) reflects signals to the receiver (40, 204). Distance measurement or space mapping can use LIDAR/laser and MEMS mirror. Releasable attachment to the drill rig can be by magnet (112). Atmospheric or barometric pressure can be detected and pressure change can be used to determine distance moved. WOB, RPM, torque and time rate of progress can be measured and combined with distance moved measurements to assess wear on a drill bit. Near real time ROP measurement can be calculated and displayed (17) and/or reported (21). Drilling efficiency and premature drill wear or change in rock can be determined.