Calibrating Gradient Tools Using Component-Specific Coefficients
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Solution Overview
Problem
Current calibration methods for gradient tools in directed drilling techniques face accuracy limitations due to singularity issues and blind spots, requiring multiple sensors to achieve precise ranging distances, especially when sensor orientation is near or at specific angles relative to the target well.
Innovation Solution
Implementing a method to calibrate gradient tools using a tool constant matrix library based on measurements at various azimuthal angles, allowing for precise calibration and ranging distance determination using normal or tangential components, or combinations thereof, thereby avoiding blind spots and improving measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current calibration procedures utilize all components to calculate tool calibration coefficient, then measurement coverage is improved, but singularity issues and blind spots occur at certain tool orientations
Solution Approach 1:
The patent segments the calibration process by creating separate calibration coefficients for different component types (normal components and tangential components) rather than using a single unified calibration approach. This segmentation allows each component type to be calibrated independently, avoiding the singularity issues that arise when all components are used together in current calibration procedures.
Solution Approach 2:
The patent implements dynamic selection of calibration coefficients based on tool orientation and component type. The system dynamically determines which calibration coefficient to use (normal or tangential) depending on the specific measurement context and tool azimuth, ensuring accurate measurements across all orientations without encountering blind spots.
2Measurement precision
If multiple sensors are installed in the ranging tool to avoid blind spots, then measurement accuracy is improved, but device complexity increases
Solution Approach 1:
The patent changes the calibration parameters by introducing separate calibration coefficients for normal and tangential components. This parameter change allows the system to achieve accurate measurements across all tool orientations using the existing sensor configuration, eliminating the need to add multiple sensors to avoid blind spots.
Solution Approach 2:
The patent creates a comprehensive calibration coefficient library that contains pre-calculated coefficients for various tool azimuths and component types. This calibration coefficient copy library allows the system to retrieve the appropriate calibration data without requiring additional physical sensors, maintaining measurement accuracy while avoiding increased device complexity.
3Device complexity
If ranging calculation uses components with blind spots, then device simplicity is maintained, but reliability deteriorates due to singularity issues
Solution Approach 1:
The patent performs preliminary calibration measurements at multiple tool azimuths (0°, 45°, 90°, 135°, 180°, 225°, 270°, 315°) to pre-determine calibration coefficients for both normal and tangential components. This preliminary action ensures that reliable calibration data is available for all orientations before actual ranging operations, preventing singularity issues during field use.
Solution Approach 2:
The patent creates a universal calibration coefficient library that serves all tool orientations and component types. This multi-functional calibration system allows the ranging tool to reliably operate at any angle to the target well by selecting the appropriate calibration coefficient from the library, eliminating operational reliability issues while maintaining simple sensor configuration.
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 enhances measurement accuracy by enabling precise calibration and ranging distance determination across a wider range of angles, reducing the need for multiple sensors and minimizing errors associated with blind spots, thus improving the effectiveness of directed drilling techniques like SAGD.
Implementation Method 1
conducting magnetic field measurements at four or more different azimuthal angles with respect to a direction to an excitation source from a tool
Data Source
AI summary
Apparatus and procedures that provide calibration for measurement tools can be implemented in a number of applications. Tool constant matrices generated in such calibration procedures can be utilized in downhole ranging measurements. Additional apparatus, systems, and methods are can be used in a variety of applications.