Borehole Depth Logging Offset Correction
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Solution Overview
Problem
Conventional borehole logging methods face inaccuracies due to debris buildup around the borehole collar, leading to inconsistent depth measurements and the need for manual surface flattening, which is time-consuming and costly, and prevents autonomous logging.
Innovation Solution
A method and apparatus for correcting depth values by determining a depth offset between the measurement reference position and the borehole collar position, allowing for accurate geological measurements without manual surface transformation, using a measurement device and controller to adjust depth values based on the offset.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual surface flattening is performed to remove debris around the borehole collar, then measurement accuracy is improved, but time consumption and operational complexity increase
Solution Approach 1:
The patent replaces manual mechanical surface flattening with an automated optical/electronic system. A camera captures images of the borehole collar and surrounding surface, and image processing algorithms automatically calculate the offset between the collar center and the measurement device reference point. This substitutes manual mechanical surface preparation with automated visual measurement and computational analysis.
Solution Approach 2:
The system enables self-service by allowing the measurement device to automatically determine and correct for surface irregularities without human intervention. The offset calculation is performed automatically by processing images captured by the camera, and the depth measurements are automatically corrected using the calculated offset values, eliminating the need for manual surface flattening operations.
2Reliability
If manual surface flattening is performed to ensure consistent depth measurements, then measurement reliability is improved, but operational cost and complexity increase
Solution Approach 1:
The patent replaces complex manual surface preparation procedures with a simplified automated imaging and calculation system. Instead of requiring operators to physically flatten the surface around the borehole collar, the system uses a camera to capture the actual surface conditions and computationally determines the offset, thereby maintaining measurement reliability while reducing operational complexity.
Solution Approach 2:
The patent introduces an intermediary computational layer between the raw measurement data and the final depth values. The offset calculation serves as an intermediary step that automatically compensates for surface irregularities, eliminating the need for manual surface transformation while ensuring consistent and reliable depth measurements across different boreholes and conditions.
3Measurement precision
If depth offset correction is applied to account for measurement reference position, then measurement accuracy is improved, but data processing complexity increases
Solution Approach 1:
The patent performs preliminary action by calculating the depth offset before conducting the actual depth measurements. The offset is determined from images captured at the beginning of the logging process, and this pre-calculated offset is then applied to correct all subsequent depth measurements. This preliminary calculation simplifies the overall data processing by establishing a correction factor in advance rather than requiring complex real-time adjustments during measurement.
Solution Approach 2:
The patent applies parameter changes by modifying the depth measurement values through a systematic offset correction. The raw depth measurements are adjusted by adding or subtracting the calculated offset value to account for the difference between the measurement device reference position and the borehole collar center. This parameter transformation maintains measurement accuracy while using a straightforward computational approach.
Data Source
AI summary
A method for logging a borehole, comprising: receiving hole data representing the borehole, wherein the hole data includes at least a collar position indicating a location of the collar of the borehole; determining a measurement reference position indicating a reference location of a measurement device configured to be deployed into the borehole; receiving, from a depth logging device, one or more depth values of the measurement device in response to the deployment, from the reference location, of the measurement device to measure the borehole; and determining one or more corrected depth values based on the one or more depth values, the collar position, and the measurement reference position.