Electro-acoustic Wellbore Telemetry Nodes
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Solution Overview
Problem
Current data transmission systems in wellbores face challenges such as tangled cables, high costs, and slow data rates, particularly in harsh downhole environments, and require precise alignment of induction coils or electrodes, which complicates the installation and increases expenses.
Innovation Solution
A hybrid wired-and-wireless acoustic telemetry system using communications nodes spaced along pipe joints, where each node is independently powered and includes an electro-acoustic transducer to convert electrical signals to acoustic waves, allowing for reliable high-speed data transmission without the need for precise alignment or special booster assemblies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If physical cables are placed along the drill string, then real-time data transmission is achieved, but the cables become tangled and break during rotation
Solution Approach 1:
The patent extracts the data transmission function from physical cables by using acoustic waves transmitted through the drill string itself. The drill string acts as the transmission medium, eliminating the need for separate cables that become tangled and break during rotation.
Solution Approach 2:
The patent replaces the mechanical cable system with an acoustic wave transmission system. Instead of using physical cables that require mechanical management during rotation, the system uses acoustic waves that can pass through the drill string material without being affected by rotation or tangling.
2Productivity
If induction coils are used for data transmission, then high data rates are achieved, but precise alignment is required which increases complexity and cost
Solution Approach 1:
The patent employs self-service by utilizing the drill string's inherent acoustic properties for signal transmission. The system automatically adapts to the drill string's characteristics without requiring external alignment or calibration, eliminating the need for precise coil positioning.
Solution Approach 2:
The patent changes the transmission parameter from electromagnetic induction (requiring precise alignment) to acoustic wave propagation through the drill string material. This parameter change allows data transmission without the need for precise alignment of transmission elements.
3Ease of operation
If radio frequency transmission is used, then wireless communication is achieved, but signal attenuation is significant near the tubular body
Solution Approach 1:
The patent uses the drill string itself as an intermediary medium for signal transmission. Instead of attempting wireless transmission through the attenuating tubular environment, the system converts electrical signals to acoustic waves that propagate through the drill string material, which serves as an effective transmission medium.
Solution Approach 2:
The patent replaces electromagnetic radio frequency transmission with acoustic wave transmission through the drill string. This substitution overcomes the signal attenuation problem by using a medium (the drill string material) that efficiently transmits acoustic energy rather than electromagnetic waves.
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
This system enables high-speed data transmission exceeding 50 bps, reducing installation complexity and costs by using acoustic signals through the pipe material, providing a robust and efficient method for transmitting subsurface data without the need for precise alignment or additional hardware.
Implementation Method 1
each node is independently powered and includes an electro-acoustic transducer to convert electrical signals to acoustic waves
Data Source
AI summary
A system for downhole telemetry employs a series of communications nodes spaced along a tubular body such as a pipe in a wellbore. The nodes allow hybrid wired-and-wireless communication between one or more sensors residing at the level of a subsurface formation and a receiver at the surface. The nodes employ electro-acoustic transducers providing node-to-node communication up a wellbore at high data transmission rates. A method of transmitting data in a wellbore uses a plurality of data transmission nodes situated along a tubular body to deliver an alternating electrical and acoustic transmission of data along the wellbore.