Hybrid Drillstring Telemetry for Noise-Resistant Data Transfer
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Solution Overview
Problem
Existing telemetry systems face challenges in achieving maximum data transmission rates along a pipe string in a wellbore due to signal attenuation and noise interference, particularly in single-hop and multi-hop topologies, which limits effective data transfer between the surface and downhole tools.
Innovation Solution
A combined telemetry system that integrates a multi-hop and single-hop topology, utilizing different physical channels for each, where multi-hop nodes boost and retransmit signals, and single-hop nodes receive and process data, enabling parallel or series operation to enhance data transmission rates and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If analog telemetry methods are used, then continuous real-time data transmission is achieved, but signal interference and noise affect measurement precision
Solution Approach 1:
The patent segments the telemetry data into two distinct types: analog data for continuous real-time transmission and digital data for high-precision measurements. This segmentation allows each data type to be transmitted through optimized channels, preventing signal interference from affecting measurement precision while maintaining continuous real-time data transmission capability.
Solution Approach 2:
The patent introduces a digital-to-analog converter as an intermediary device that converts digital measurement data into analog signals for transmission. This intermediary layer isolates the precise digital measurements from the analog transmission medium, allowing high-precision data to be transmitted without direct exposure to signal interference and noise.
2Measurement precision
If digital telemetry methods are used, then measurement precision is improved, but data transmission delay increases
Solution Approach 1:
The patent segments data transmission into two parallel paths: digital data transmission for high-precision measurements and analog data transmission for real-time continuous data. This segmentation enables digital data to maintain its precision advantages while the analog path handles time-critical data, reducing overall transmission delay through parallel processing.
Solution Approach 2:
The patent implements preliminary conversion of digital data to analog signals for immediate transmission, while digital data is prepared in advance for later transmission. This preliminary action ensures that time-critical data is transmitted without delay while maintaining the precision benefits of digital processing for non-time-critical data.
3Device complexity
If only one telemetry method is used, then system complexity is reduced, but adaptability to different transmission requirements decreases
Solution Approach 1:
The patent merges analog and digital telemetry systems into a unified hybrid system that handles both continuous real-time data and high-precision measurements. This combination provides adaptability to different transmission requirements while managing complexity through integrated architecture that coordinates both data types through a single telemetry device.
Solution Approach 2:
The patent creates a universal telemetry system that can handle multiple data types and transmission requirements through a single integrated device. The system performs both analog and digital data transmission functions, providing versatility for different application scenarios while maintaining a unified system structure.
Data Source
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AI summary
A combined telemetry system that can be used while drilling a wellbore consists of a multi-hop telemetry method and a single-hop telemetry method combined in parallel. The multi-hop and single-hop methods can be operated in parallel, for example, so that each telemetry method caries data concurrently from the Measuring-While-Drilling tool located in the Bottom-Hole-Assembly. The multi-hop and single-hop methods can also be operated in series, for example, so that data from the Measuring-While-Drilling tool located in the Bottom-Hole-Assembly are first carried with the single-hop telemetry method and then transferred to the multi-hop telemetry method at one or more node(s) close to the surface. Preferably, the multi-hop telemetry method can also carry data from along-string sensors. Another combined telemetry system that can be used while drilling a wellbore consists of two single-hop telemetry methods combined in parallel.