Downhole Modem Data Compression for Timely Well-Test Delivery
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Solution Overview
Problem
Existing downhole communication systems face challenges in accurately and reliably transmitting complex data between downhole locations and the surface, particularly in the oil and gas industry, where efficient data compression and dynamic sensor data management are needed to optimize bandwidth usage and real-time data reconstruction.
Innovation Solution
A modem system with a transceiver assembly, processor-readable medium, and power supply that performs lossless or near-lossless data compression by calculating and recalculating the output bit stream size, decimating data if necessary, and selecting the most efficient encoding scheme to encode data within a predetermined budget, while also continuously interrogating sensors for dynamic data mapping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If data is transmitted with full precision and without compression, then measurement precision is maintained, but bandwidth consumption increases and transmission time is excessive
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting compression levels and encoding schemes based on data characteristics and available bandwidth. The system transforms data from its original high-precision form into compressed representations that maintain essential information while reducing transmission requirements, then reconstructs the data at the receiving end with controlled precision loss.
2Productivity
If data compression is applied to reduce bandwidth usage, then transmission efficiency improves, but measurement precision is lost
Solution Approach 1:
The patent implements partial compression where only certain portions of the data are compressed while maintaining full precision for critical parameters. The system selectively applies compression algorithms to non-critical data elements, preserving measurement precision for essential well-test parameters while achieving bandwidth reduction for auxiliary data.
Solution Approach 2:
The system employs feedback mechanisms where compression performance is continuously monitored and adjusted. The receiving end validates compressed data against expected ranges and triggers retransmission or alternative encoding when precision thresholds are not met, ensuring measurement accuracy is maintained despite compression.
3Productivity
If multiple compression schemes are tested and selected based on parameters, then compression efficiency improves, but device complexity increases
Solution Approach 1:
The patent implements dynamic scheme selection where the compression algorithm is automatically chosen based on real-time data characteristics, available bandwidth, and priority levels. The system transitions between different compression schemes (e.g., lossless, lossy, hybrid) depending on current operational conditions, optimizing compression efficiency without requiring manual configuration.
4Productivity
If data points are equally distributed to save bandwidth, then bandwidth usage is optimized, but time distribution of data points becomes rigid and may miss critical events
Solution Approach 1:
The system uses periodic transmission intervals combined with event-triggered transmissions. Data is sent at regular intervals to maintain bandwidth efficiency, but additional transmissions are automatically initiated when critical events are detected (e.g., pressure spikes, flow changes), ensuring both bandwidth optimization and reliable capture of important well-test events.
Data Source
AI summary
A method is described for performing, by a processor, one or more queries on one or more sensors, for one or more data collected by the one or more sensors, at predetermined instants of time by a downhole modem operably coupled to the one or more sensors, prior to receiving a request for transmission of the data from a surface modem. The method also includes receiving, by the processor, one or more data from one or more sensors in response to the one or more queries, and storing, by the processor, the one or more data in a buffer coupled to the downhole modem.