Acoustic Telemetry Network Throughput Decoupling
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Solution Overview
Problem
Acoustic telemetry systems in well drilling and production face challenges due to dispersion, phase non-linearity, frequency-dependent attenuation, and significant noise, which limit data packet transmission speed and throughput, especially with multiple nodes along the drillstring.
Innovation Solution
Implementing multiplexing of the acoustic transmission channel with multiple nodes transmitting simultaneously, using methods such as node timing, frequency differentiation, signal orthogonality, and directional transmitter and receiver configurations to control internode interference and increase network throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple nodes transmit data packets sequentially using time division multiplexing to minimize interference, then internode interference is reduced, but network throughput decreases and latency increases
Solution Approach 1:
The patent applies periodic action by implementing time-division multiplexing where nodes transmit data packets in sequential time slots rather than simultaneously. Each node is assigned specific time windows for transmission, creating a periodic transmission pattern that eliminates internode interference while maintaining systematic data flow through the drillstring acoustic channel.
Solution Approach 2:
The patent segments the acoustic transmission channel into multiple time slots, with each node assigned to specific time slots for transmission. This temporal segmentation allows the single acoustic channel to serve multiple nodes sequentially, preventing interference between simultaneous transmissions while maximizing channel utilization over time.
2Productivity
If multiple nodes transmit data packets simultaneously on the acoustic channel to increase throughput, then network throughput increases, but internode interference increases and signal detection reliability decreases
Solution Approach 1:
The patent implements periodic transmission slots where nodes alternate their transmissions in a systematic pattern. This periodic structure ensures that while multiple nodes are served, only one node transmits at any given time, eliminating interference and maintaining signal detection reliability while achieving high overall throughput through efficient time utilization.
Solution Approach 2:
The patent employs dynamic time slot allocation where transmission assignments can be adjusted based on network conditions, node priorities, and traffic demands. This dynamic approach allows the system to optimize throughput by allocating more time slots to high-priority nodes or nodes with more data to transmit, while maintaining interference-free operation through sequential transmission.
3Adaptability or versatility
If increase the number of transceiver nodes along the drillstring to expand monitoring coverage, then measurement capability increases, but network complexity and internode interference increase
Solution Approach 1:
The patent segments the drillstring into multiple zones with transceiver nodes distributed throughout, allowing monitoring coverage to scale with the number of nodes. Each node independently monitors its local segment and transmits data through the acoustic channel, enabling linear scaling of coverage without proportionally increasing system complexity due to the simple sequential transmission protocol.
Solution Approach 2:
The patent implements a universal acoustic transmission channel that serves all transceiver nodes along the drillstring. The same acoustic medium and reception system handle communications from any number of nodes, providing multi-functionality that allows the network to expand in coverage while reusing the same infrastructure rather than requiring dedicated channels for each node.
4Measurement precision
If increase the number of transceiver nodes to improve data collection, then measurement precision improves, but signal attenuation and noise from multiple sources worsen detection quality
Solution Approach 1:
The patent uses periodic time-division multiplexing where each node transmits during its assigned time slot, eliminating simultaneous transmissions that would cause interference. This periodic structure ensures that signals from different nodes do not overlap, maintaining measurement precision even as the number of nodes increases, while the sequential nature reduces cumulative noise effects.
Solution Approach 2:
The patent extracts and separates signals from different nodes by assigning them to distinct time slots, effectively isolating each node's signal from others. This extraction approach removes the harmful mixing of signals that would occur with simultaneous transmission, allowing each node's measurement data to be detected with high precision despite the presence of multiple nodes in the network.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Decouples network throughput from the number of nodes, reducing interference and increasing performance, while maintaining reliable signal detection and decoding, even with increased node numbers, thus enhancing data transmission rates and reducing latency.
Implementation Method 1
the transmitter is designed to produce elastic extensional stress waves that propagate through the drillstring to the surface
Implementation Method 2
Acoustic telemetry is a method of communication used in the well drilling, completion and production industries
Implementation Method 3
the waves are detected by sensors, such as accelerometers, attached to the drillstring or associated drilling rig equipment
Implementation Method 4
the nearly regular periodic structure of drillpipe imposes a passband/stopband structure on the frequency response, similar to that of a comb filter
Implementation Method 5
Dispersion, phase non-linearity and frequency-dependent attenuation make drillpipe a challenging medium for telemetry
Implementation Method 6
the data packets were transmitted (typically up-string) using time division multiplexing (TDM) techniques
Data Source
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AI summary
A telemetry system produces, transmits and receives signal sets from network nodes, which correspond to transceiver stations. Repeater scheduling and other interference mitigating techniques are utilized to simultaneously transmit from multiple nodes with minimized network degradation. Update interval/rate and network throughput are thereby fixed regardless of the number of network nodes and a network telemetry method is provided using the system.