Adjacent Wellbore EM Telemetry via Surface Transceiver
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Solution Overview
Problem
It is challenging to wirelessly communicate data from well tools, such as logging while drilling (LWD) or measuring while drilling (MWD) tools, to the surface in well systems due to the difficulty in transmitting signals through subterranean formations, which often results in low signal-to-noise ratios and requires the placement of active components in the wellbore, which is costly and power-intensive.
Innovation Solution
A bidirectional electromagnetic (EM) telemetry system using a surface transceiver and a downhole transceiver in an adjacent wellbore, where the transceivers communicate through electrodes, with the surface transceiver detecting EM signals and decoding data using a fiber optic system to avoid signal attenuation and reduce the need for active components in the wellbore.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wireless communication is attempted through subterranean formations, then data transmission from well tools to surface is achieved, but signal-to-noise ratio deteriorates
Solution Approach 1:
The patent introduces an adjacent wellbore as an intermediary medium for EM signal transmission. Instead of transmitting signals directly through the resistive subterranean formation, the system uses the adjacent wellbore filled with conductive drilling fluid as a transmission path, significantly improving signal-to-noise ratio while maintaining reliable data transmission from downhole tools to surface
2Reliability
If active components are placed in the wellbore to enable wireless communication, then data transmission capability is improved, but system cost and power consumption increase
Solution Approach 1:
The patent extracts the active transceiver components from the wellbore environment and relocates them to the surface. The downhole tool only requires passive EM signal generation, while the active signal processing, modulation, and demodulation functions are performed by the surface transceiver system, eliminating the need for power-intensive active components in the wellbore
Solution Approach 2:
The drilling fluid in the adjacent wellbore serves as a self-service medium that naturally provides the conductive path needed for EM signal transmission. The system utilizes the existing drilling fluid without requiring additional active components or power sources in the wellbore, as the fluid itself enables the telemetry function
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
The EM telemetry system improves signal-to-noise ratios, allows for longer wellbore drilling, and eliminates the need for active components in the wellbore, reducing costs and power consumption while maintaining reliable data transmission.
Implementation Method 1
The downhole transceiver can communicate data (e.g., associated with a LWD or MWD process) to the surface transceiver by generating the EM signal
Implementation Method 2
The EM signal can cause voltages to be generated on the electrodes of the surface transceiver
Data Source
AI summary
A first transceiver positioned in a wellbore can transmit an electromagnetic signal. The electromagnetic signal can include encoded data. A second transceiver can be positionable at a surface of an adjacent wellbore and can include a computing device communicatively coupled to electrodes positionable in the adjacent wellbore. The electrodes can receive the electromagnetic signal and generate respective voltages in response to the electromagnetic signal. The computing device can determine a decoded version of the encoded data based on a voltage difference between the electrodes.