Drill Bit Sensor Package for Real-Time UCS and Wear Estimation
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Solution Overview
Problem
Current methods fail to accurately determine unconfined compressive strength (UCS) as a continuous function along well depth and struggle to differentiate between bit wear and formation strength causing reduced rate of penetration (ROP) during drilling operations.
Innovation Solution
A sensor package on the drill bit measures revolutions per minute, weight on bit, and torque, combining these with torsional vibration data to identify UCS, bit wear, and rock internal friction angle, using a bit-rock interaction model to estimate error ranges and determine wear at depth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If laboratory tests on core samples are used to obtain UCS data, then reliable quantitative data on unconfined compressive strength is obtained, but high resolution continuous UCS data along well depth cannot be achieved
Solution Approach 1:
The patent replaces traditional mechanical laboratory testing methods with a downhole sensor system that measures drilling parameters (torque, weight on bit, revolutions per minute) and uses these measurements to calculate UCS in real-time. This substitution enables continuous UCS measurement along the well depth without requiring physical core samples to be brought to the surface for testing.
Solution Approach 2:
The patent introduces drilling parameters (torque, weight on bit, RPM) as intermediary measurements that can be obtained downhole during drilling operations. These parameters serve as proxies that are correlated with UCS through empirical relationships, allowing indirect measurement of rock strength without direct mechanical testing.
2Productivity
If rate of penetration reduction is monitored during drilling, then drilling efficiency is tracked, but it is unclear whether reduction is due to bit wear or strong formation
Solution Approach 1:
The patent implements a feedback system where downhole sensors continuously measure drilling parameters and transmit this data to the surface. The system provides real-time feedback on torque, weight on bit, and RPM, allowing operators to distinguish between ROP reductions caused by bit wear versus strong formation based on the pattern and magnitude of parameter changes.
Solution Approach 2:
The patent uses drilling parameters (torque, weight on bit, RPM) as intermediary indicators that provide information about both formation properties and bit condition. By analyzing these intermediary measurements, the system can infer the cause of ROP reduction without directly observing either bit wear or formation strength.
3Loss of time
If downhole sensors measure drilling parameters in real time, then bit wear and formation characteristics can be identified continuously, but the complexity of the measurement and analysis system increases
Solution Approach 1:
The patent employs a multi-functional sensor package that simultaneously measures multiple drilling parameters (torque, weight on bit, revolutions per minute) with a single integrated device. This universal sensor system performs multiple measurement functions that would otherwise require separate instruments, reducing overall system complexity while enabling comprehensive real-time monitoring.
Data Source
AI summary
A method and a system for a confined compressive strength (CCS) and an unconfined compressive strength (UCS) for one or more bedding layers. The method may include identifying a depth interval during a drilling operation as a distance between a first depth and a second depth, measuring one or more drill bit responses within the depth interval using a sensor package disposed on the drill bit, identifying one or more torsional bit vibrations, and identifying one or more bedding layers of the formation within the depth interval from the one or more torsional bit vibrations. The method may further include identifying the (CCS) and the (UCS) for each of the one or more bedding layers and identifying a bit wear of the drill bit within each of the one or more bedding layers using the one or more drill bit responses and the one or more torsional bit vibrations.