Wellbore Telemetry Compression Using Delta Logging Data
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Solution Overview
Problem
Existing data transmission methods through drilling mud in wellbores are inefficient and error-prone, limiting data rates and affecting the ability to control wellbore operations effectively.
Innovation Solution
Implementing a data compression technique that transmits the difference between current and reference data samples, using a combination of full measurement values and delta values, to enhance transmission efficiency and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If data transmission frequency is increased to meet operational control requirements, then the ability to control wellbore operations is improved, but error rates increase and transmission reliability deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-calculating delta values (differences between consecutive data samples) at the transmitter before transmission. This preprocessing step compresses the data representation, allowing more frequent transmissions within the same bandwidth constraints, thereby improving both productivity and maintaining reliability through efficient data encoding
Solution Approach 2:
The patent changes the parameter representation from absolute data values to differential delta values. By transmitting the difference between consecutive samples rather than full values, the data requires fewer bits for transmission, enabling higher transmission frequencies while maintaining error rates within acceptable limits
2Productivity
If data compression is applied to increase transmission efficiency, then bandwidth utilization is improved, but data reconstruction accuracy may deteriorate
Solution Approach 1:
The transmitter performs preliminary calculation of delta values representing the difference between current and previous data samples. This compression technique reduces the number of bits required for transmission while preserving the ability to accurately reconstruct original values at the receiver by accumulating delta values
Solution Approach 2:
The system implements feedback mechanisms where the receiver accumulates transmitted delta values to reconstruct original data samples. This feedback loop ensures that even with compressed transmission, the reconstructed data maintains sufficient accuracy for operational control decisions
Data Source
AI summary
Described herein are systems and techniques for improving the transmission of data up a wellbore such that wellbore operations may be performed or controlled more efficiently. When a wellbore is drilled or otherwise used, sensors may be deployed in the wellbore to measure parameters that may include borehole pressure, annular pressure, weight-on-bit, torque-on-bit, temperature, or other borehole logging data, for example. Data sensed by the sensors or interpreted from received sensor data may be sent up-hole to electronics that may reside at the surface of the Earth. Since wellbore (borehole) logging data usually have moderate levels of continuity or consistency between respective samples, differences between data samples acquired over a period of time may be expected to have smaller amplitudes/deviations than the data samples themselves. As such, data compression can be achieved by transmitting data that identifies a difference between an initial data sample and a subsequent reference data sample.