Adaptive Delta Encoding for Downhole Borehole Image Data Compression
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Solution Overview
Problem
Current data compression techniques for downhole data transmission during drilling operations are insufficient in increasing the effective data transmission rate without compromising data quality, due to bandwidth and storage limitations in LWD/MWD systems.
Innovation Solution
Adaptive delta encoding schemes are employed to optimize the compression of borehole image data, selecting the most suitable encoding method based on the specific data characteristics and formation properties, reducing the data size without sacrificing quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional data compression techniques are used, then data transmission rate is improved, but data quality deteriorates
Solution Approach 1:
The patent applies delta encoding which transforms the data representation by encoding differences between consecutive values rather than absolute values. This parameter transformation reduces data size while preserving the ability to reconstruct original data, thereby improving transmission rate without sacrificing data quality
Solution Approach 2:
The patent applies different compression strategies to different portions of the data based on local characteristics. By analyzing data patterns and applying appropriate encoding methods to specific segments, it achieves optimal compression ratios while maintaining data integrity in each local region
2Quantity of substance
If data acquisition rate is increased, then information completeness is improved, but transmission capability deteriorates
Solution Approach 1:
By transforming data into delta-encoded format, the patent reduces the effective data size that needs to be transmitted. This parameter transformation allows higher data acquisition rates to be matched by proportionally higher effective transmission rates, resolving the mismatch between data generation and transmission capabilities
3Productivity
If data size is reduced, then transmission rate is improved, but data quality deteriorates
Solution Approach 1:
The delta encoding technique changes the parameter representation from absolute values to differential values. This transformation reduces data size for transmission while maintaining the complete information content, as the original data can be perfectly reconstructed by summing the delta values, thus improving transmission rate without quality loss
Data Source
AI summary
System and methods for encoding downhole image data are provided. Measurements collected by a downhole tool around a circumference of a borehole drilled within a formation are obtained. The acquired measurements are assigned to a plurality of azimuthal bins. Each azimuthal bin corresponds to an angular sector around the circumference of the borehole in which at least one of the measurements was collected by the downhole tool at a predetermined depth within the formation. At least one of a plurality of delta encoding schemes is selected for encoding the measurements assigned to the plurality of azimuthal bins. A delta-encoded binary representation of the measurements assigned to the plurality of bins is generated, based on the selected delta encoding scheme. The generated delta-encoded binary representation is transmitted from the downhole computing device to a surface computing device located at the surface of the borehole.