Drill Bit Resistivity Sensor Integration
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Solution Overview
Problem
Current methods for making resistivity measurements near the drill bit during drilling operations face challenges such as measurement errors due to fluid invasion, providing electrical communication, and configuring sensors effectively, which limits practical configurations for cost-effective and high-quality measurements.
Innovation Solution
A bottom hole assembly with a drill bit incorporating a sensor, a geosteering assembly, and toroid antennas for electrical communication, allowing resistivity measurements at or near the drill bit, with a transmitter located a predetermined distance from the sensor to achieve desired sensitivity and facilitate electrical communication through a conductive cable and electronics assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If resistivity measurements are made at the drill bit to minimize formation invasion effects, then measurement accuracy is improved, but providing electrical communication and configuring sensors becomes more complex
Solution Approach 1:
The drill bit is designed to serve multiple functions: it performs drilling operations while simultaneously housing sensors (electrodes) for resistivity measurements and incorporating electrical communication components. The body member integrates both cutting elements and sensor mounting structures, allowing the drill bit to function as both a drilling tool and a measurement platform.
Solution Approach 2:
The sensor assembly and electrical communication components are nested within the drill bit structure. The electrodes are positioned within the body member, with conductive elements embedded in the stabilizer blade, creating a nested configuration where measurement components are integrated inside the drilling tool.
2Measurement precision
If sensors are configured to obtain the highest quality measurements at the drill bit, then measurement precision is improved, but the cost and manufacturing complexity increase
Solution Approach 1:
The stabilizer blade is designed with a specific conductive region that provides localized electrical communication capability. The conductive element is positioned at a specific location on the stabilizer blade where it can effectively communicate with the formation while maintaining manufacturing feasibility. This localized approach provides high measurement quality at the critical measurement point without requiring the entire drill bit to be manufactured with specialized properties.
3Measurement precision
If a transmitter is located a predetermined distance from the sensor to achieve desired sensitivity, then measurement sensitivity is improved, but the device configuration becomes more complex
Solution Approach 1:
The patent utilizes the longitudinal dimension of the drill bit to achieve the required transmitter-sensor spacing. By positioning the transmitter and sensor at different longitudinal locations along the drill bit axis, the design achieves the desired sensitivity through spatial separation in one dimension without requiring complex lateral or radial configurations.
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
Enables accurate resistivity measurements at the drill bit, minimizing formation invasion effects and providing real-time data for geosteering, while being cost-effective and practical for drilling operations.
Implementation Method 1
toroid antennas for electrical communication, allowing resistivity measurements at or near the drill bit, with a transmitter located a predetermined distance from the sensor
Implementation Method 2
resistivity measurements at the drill bit, minimizing formation invasion effects and providing real-time data
Data Source
AI summary
A drilling assembly includes a first tubular member supporting a first transmitter antenna and a steering assembly located beneath the first tubular member. The drilling assembly also includes an earth boring device comprising a drill bit. The drill bit has a body member, a bottommost surface and a gage surface at a stabilizing section of the drill bit. The earth boring device is supported beneath the steering assembly. The earth boring device includes a second transmitter/receiver antenna supported in spaced relation to the first transmitter antenna and within 36 inches of the bottommost surface of the drill bit, and at least one electrode generally at an outer surface of the stabilizing section of the drill bit.