Downhole Wireless Echo Communication System for Signal Reliability
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Solution Overview
Problem
Wireless communication between downhole devices in a wellbore is often hindered by spatially non-uniform transmission paths and obstructive equipment, leading to signal loss or degradation due to 'dead zones' and variability in receiving device sensitivity.
Innovation Solution
A system of triggers and a hub, where triggers are arranged within a first distance of each other and the hub is separated by a greater distance, allowing triggers to receive and re-broadcast wireless signals to ensure reliable communication by echoing signals to adjacent receivers, thereby overcoming direct line-of-sight obstacles and signal strength issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If wireless communication is used between downhole devices, then the risk of damage from hard lines is eliminated, but signal reliability deteriorates due to dead zones and obstructions
Solution Approach 1:
The communication system is segmented into multiple triggers distributed along the tubular, each capable of receiving and re-broadcasting signals. This segmentation allows signals to be relayed through intermediate points, overcoming dead zones and obstructions that would block direct communication between distant devices.
Solution Approach 2:
Triggers act as intermediary devices between the hub and distant receivers. When the hub transmits a signal, triggers within range receive it and re-broadcast it to extend the communication range, enabling reliable communication without direct line-of-sight between the hub and all receivers.
2Length of stationary object
If single repeaters are used at intervals along tubing, then communication range is extended, but signal reliability worsens due to spatially dependent signal blocking
Solution Approach 1:
Instead of using single repeaters at intervals, the system employs multiple triggers clustered within a first distance of each other. This segmentation approach creates overlapping coverage zones where signals can be received and re-broadcast by multiple triggers, ensuring reliability even if some triggers are blocked by intervening equipment.
Solution Approach 2:
The system implements local quality by having triggers distributed in clusters rather than uniformly spaced. Each cluster provides localized signal reinforcement, and the hub is positioned at a greater distance (second distance greater than first distance) to avoid being blocked by equipment near the triggers while still maintaining communication through the clustered triggers.
3Reliability
If triggers are placed close together within a first distance, then signal coverage is improved, but device complexity increases
Solution Approach 1:
Each trigger is designed as a universal device capable of both receiving signals from the hub and re-broadcasting them to extend coverage. This multi-functionality reduces the need for different types of devices and allows the same trigger design to be used throughout the system, reducing overall complexity despite having multiple triggers.
Solution Approach 2:
Multiple triggers are merged into clusters where they work collectively to provide signal coverage. By placing triggers within a first distance of each other, their coverage zones overlap and combine, providing redundant signal paths without requiring each trigger to individually cover the entire distance, thus reducing the total number of triggers needed compared to uniformly spaced single repeaters.
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
Enhances the reliability of downhole wireless communication without adding components, allowing existing tool string parts to rebroadcast command signals, ensuring that all receivers can receive intended signals, even in areas with low signal strength or obstructions.
Implementation Method 1
The hub is configured to wirelessly transmit a signal configured for receipt by at least one of the plurality of triggers. Each of the plurality of triggers is configured to receive and re-broadcast the signal.
Data Source
AI summary
An echo communication system has a plurality of triggers disposed within a first distance of each other and a hub separated from the plurality of triggers by at least a second distance that is greater than the first distance. The hub is configured to wirelessly transmit a signal intended for one of the triggers and each of the triggers will re-broadcast the same signal if they are not the intended recipient.