Instrumented Cutting Element At-Bit Resistivity Measurement
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Solution Overview
Problem
Conventional drilling technologies face challenges in obtaining accurate, real-time diagnostic information about drill bit performance and subterranean formations due to measurements being taken behind the drill head, leading to errors and inefficiencies in drilling operations.
Innovation Solution
Integration of sensors within cutting elements of earth-boring drill bits to measure resistivity of the subterranean formation directly, enabling real-time data collection on formation characteristics and drill bit performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If measurements are taken behind the drill head, then the measurement system is simpler, but the measurement precision and timeliness deteriorate due to errors and delays in data transmission
Solution Approach 1:
The measurement system is segmented by placing sensors directly on individual cutting elements rather than using a centralized measurement system behind the drill head. This segmentation enables at-bit resistivity measurements to be taken directly at the cutting interface, improving measurement precision and timeliness while reducing data transmission delays
Solution Approach 2:
The measurement approach transitions from a downstream measurement location (behind the drill head) to an at-bit measurement location (at the cutting interface). This spatial dimensionality change eliminates the time delay and error accumulation associated with data transmission through the drill string, achieving real-time formation evaluation
2Productivity
If sensors are integrated into cutting elements, then real-time data collection is enabled, but the manufacturing precision requirements increase
Solution Approach 1:
The cutting element structure itself serves as the sensor mounting platform, utilizing the existing cutting element geometry and material properties. This self-service approach reduces the need for additional precision manufacturing steps, as the sensor is integrated into the cutting element's inherent structure rather than requiring separate precision mounting fixtures
Solution Approach 2:
The sensor positioning tolerances are relaxed by changing the measurement parameters and signal processing approaches. The system accommodates variations in sensor position through electrical signal calibration and formation resistivity calculation methods that are less sensitive to precise sensor location, thereby reducing manufacturing precision requirements
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
This approach provides accurate, real-time resistivity measurements, enhancing drilling efficiency by optimizing drilling parameters, reducing the risk of missed pay-zones, and enabling active bit control.
Implementation Method 1
the at least one sensor oriented and configured to determine resistivity of a contacting formation
Data Source
AI summary
A cutting element for an earth-boring drilling tool comprises a cutting body having a cutting surface thereon, and a sensor coupled with the cutting surface, the sensor configured to determine resistivity of a contacting formation. An earth-boring drilling tool comprises a bit body and an instrumented cutting element coupled with the bit body. The cutting element includes a cutting body having a cutting surface thereon, and at least one sensor located proximate the cutting surface. The at least one sensor is oriented and configured to determine resistivity of a contacting formation. A method of determining resistivity of a subterranean formation during a drilling operation comprises energizing a sensor of an instrumented cutting element of a drill bit, sensing a return signal flowing on or through the subterranean formation through the instrumented cutting element, and determining a resistivity of the subterranean formation based, at least in part, on the return signal.