Hybrid Downhole Telemetry Using Acoustic Transceivers
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Solution Overview
Problem
Current data transmission methods in the oil and gas industry during wellbore completion operations, such as perforating, fracturing, and acid-treating, are limited by the inability to wirelessly transmit data in real-time from downhole sensors to the surface, especially in complex formations requiring staged treatment of multiple zones.
Innovation Solution
A hybrid wired-and-wireless downhole telemetry system using sensor communications nodes with electro-acoustic transceivers, placed along the wellbore, that transmit data acoustically through the pipe as mechanical waves, enabling real-time data transmission from downhole sensors to the surface, even during perforating and fracturing operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wired data transmission is used during wellbore completion operations, then data can be transmitted from downhole sensors, but real-time wireless transmission capability is lost
Solution Approach 1:
The system divides the data transmission function into two independent segments: acoustic transmission nodes permanently installed in the wellbore for wireless data collection, and a wired communication system for reliable data transfer. This segmentation allows the system to simultaneously provide real-time wireless monitoring capability and reliable data transmission during completion operations.
Solution Approach 2:
Acoustic transmission nodes serve as intermediary devices between the downhole sensors and the surface system. These nodes collect data from sensors and transmit it acoustically to the surface, enabling real-time wireless monitoring without requiring direct wired connections during dynamic completion operations.
2Ease of operation
If wireless data transmission is implemented, then real-time monitoring is enabled, but system complexity increases
Solution Approach 1:
The acoustic transmission nodes are designed as multi-functional devices that can operate in multiple modes: acoustic transmission during completion operations, and alternative communication methods during production. This universality reduces overall system complexity by using a single integrated platform rather than separate systems for different operational phases.
Solution Approach 2:
The system dynamically adapts its communication method based on operational phase. During completion operations, it uses acoustic transmission for real-time wireless monitoring. During production, it switches to alternative communication methods. This dynamic behavior allows real-time monitoring when needed while managing system complexity through context-appropriate operation.
3Productivity
If acoustic transmission through pipe is used, then real-time data transmission during perforating and fracturing is enabled, but transmission reliability may be affected by downhole conditions
Solution Approach 1:
The system incorporates error correction codes and signal redundancy mechanisms in advance to cushion against potential signal degradation from downhole conditions. Acoustic transmission nodes are strategically positioned and calibrated before operations to ensure reliable signal propagation through the wellbore environment during high-productivity activities like perforating and fracturing.
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
Enables real-time monitoring and data transmission from multiple zones during wellbore completion operations, improving the efficiency and accuracy of hydraulic fracturing and acid treatment by providing continuous data feedback to the surface, thus optimizing wellbore treatment and production.
Implementation Method 1
an electro-acoustic transceiver, which converts electrical signals to acoustic waves that pass through the pipe wall
Implementation Method 2
transmitting data as acoustic waves, or mechanical waves, at a rate exceeding about 50 bps
Data Source
AI summary
A method of transmitting data in a wellbore uses a signal receiver that is run into the wellbore on a working string. The signal receiver receives wireless signals from receiver communications nodes placed along the wellbore. The data from those signals is then sent up the wellbore, either by directing the signals directly up the working string, or by spooling the string to the surface and uploading the data. Sensors and associated communications nodes are placed within the wellbore to collect data. The communications nodes may be the signal receiver nodes; alternatively, the communications nodes may send data from the sensors up the wellbore through acoustic signals to a receiver communications node. In the latter instance, intermediate communications nodes having electro-acoustic transducers are used as part of a novel telemetry system.