Downhole Bitstream Telemetry With Forward Error Correction
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Solution Overview
Problem
Current telemetry techniques in hydrocarbon exploration, such as Mud Pulse Telemetry, face challenges with low data rates and varying communication quality, leading to errors in downhole data transmission, particularly for bit-sensitive data, which can be damaged or destroyed by errors in the communication channel.
Innovation Solution
A method and system that involve compressing bit-sensitive data streams from downhole measurement devices using forward error correction codes, grouping data into blocks, and transmitting these blocks with synchronization symbols to ensure error correction and detection, allowing for real-time error correction during transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If data compression is applied to increase data rate, then transmission efficiency is improved, but error susceptibility increases
Solution Approach 1:
The patent divides the compressed bit stream into multiple data blocks, where each block is independently encoded with forward error correction codes. This segmentation allows error correction to be applied to manageable units of data, maintaining the benefits of compression while enabling reliable transmission through systematic error protection in each segment.
Solution Approach 2:
The patent applies forward error correction coding to data blocks before transmission through the communication channel. This preliminary action of adding redundancy and error correction capabilities ensures that errors can be detected and corrected during transmission, preventing data corruption while maintaining high data rates achieved through compression.
2Reliability
If forward error correction coding is applied to improve reliability, then data integrity is improved, but device complexity increases
Solution Approach 1:
The patent segments the data into blocks and applies error correction coding to each block independently. This segmentation approach allows the use of efficient, well-established error correction algorithms on manageable data units, reducing the overall complexity compared to applying correction to the entire compressed stream at once while maintaining high reliability.
Solution Approach 2:
The patent uses forward error correction codes that create redundant copies of data information within each block. These redundant copies serve as backups that can be used to correct errors without requiring complex real-time communication protocols or feedback mechanisms, thereby improving reliability while keeping the system relatively simple.
3Reliability
If data blocks are grouped and coded to enable error correction, then transmission reliability is improved, but transmission time increases
Solution Approach 1:
The patent segments the compressed data into blocks that can be transmitted independently with error correction. This segmentation enables parallel processing and efficient transmission scheduling, allowing the system to maintain high data rates while incorporating error correction overhead, thereby minimizing the time penalty associated with reliability protection.
Solution Approach 2:
The patent optimizes parameters such as block size, coding rate, and data compression level to achieve the best balance between transmission speed and error correction effectiveness. By carefully tuning these parameters, the system minimizes the time added by error correction while maintaining high reliability, adapting the parameters to the specific communication channel conditions and data characteristics.
Data Source
AI summary
A method for communication between a geologic downhole measurement device and a receiver is provided. The method includes: receiving a bit sensitive data stream representing at least one property of at least one of a geologic formation and a borehole; grouping the data stream into at least one data block; and coding the data block with a forward error correction code. A system and computer program product for communication between a geologic downhole measurement device and a receiver are also provided.