Downhole Wireless Communication via Fluid Flow Perturbations
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Solution Overview
Problem
Existing downhole gauges in wells face frequent failures due to corrosion and damage, leading to costly and time-consuming well recompletion, and conventional well testing methods struggle with unreliable data capture and real-time information gaps, especially in non-drilling applications.
Innovation Solution
A retrofit, retrievable wireless gauge system using flowing fluid as an energy source and communication channel, employing perturbation signals transmitted through the well's annulus to bypass noise zones and obstacles, with self-sustained power and wireless communication systems for reliable data transmission to surface or subsea locations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Tubing Enclosed Cable (TEC) is used to provide power and communication between downhole gauge and surface installation, then reliable data transmission is achieved, but the system is prone to failure and damage over time due to corrosion
Solution Approach 1:
The patent extracts the communication function from the physical cable connection by using pressure wave signals transmitted through the wellbore fluid. This eliminates the TEC cable that was susceptible to corrosion and damage, while maintaining the ability to transmit data from the downhole gauge to the surface installation.
Solution Approach 2:
The patent replaces the mechanical/electrical TEC cable system with a fluid-mechanical pressure wave transmission system. Instead of using electrical signals through a physical cable, the system uses pressure waves generated by the downhole gauge and transmitted through the wellbore fluid to convey data to the surface.
2Loss of information
If conventional well testing methods are used, then data can be captured, but real-time information gaps occur and data capture is unreliable
Solution Approach 1:
The patent enables continuous real-time data transmission by using the flowing wellbore fluid as a continuous communication channel. The pressure wave signals are transmitted continuously as the fluid flows, eliminating the intermittent data capture issues of conventional methods and providing uninterrupted real-time information.
Solution Approach 2:
The patent introduces the wellbore fluid as an intermediary medium for data transmission. The flowing fluid serves as both the working medium for well operations and the transmission medium for data signals, enabling reliable and continuous communication without interruption.
3Productivity
If wireless communication is implemented in wells, then operational delays and costs are reduced, but signal impediments occur in complex well environments
Solution Approach 1:
The patent uses hydraulic pressure waves transmitted through the wellbore fluid to carry communication signals. This approach leverages the existing fluid flow in the wellbore as the transmission medium, allowing wireless-like communication without the signal interference problems that occur with electromagnetic waves in complex well environments.
Solution Approach 2:
The patent encodes data by modulating parameters of the pressure waves (such as frequency, amplitude, or timing characteristics) generated by the downhole gauge. By changing these physical parameters of the pressure signals, the system can transmit various types of information reliably through the fluid medium despite the challenging well environment.
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
Provides real-time downhole data for well testing and long-term monitoring, reducing operational delays and costs by enabling reliable, long-term data acquisition without well recompletion, and overcoming signal impediments in complex well environments.
Implementation Method 1
A method of wirelessly communicating information from and to well locations includes establishing a control loop for inducing perturbations in a flowing wellbore or flowline that extends to the surface of a wellbore. The perturbations can be used to transmit information from one location to another.
Implementation Method 2
The downhole tool can use flowing fluid (e.g., the production flow in a producing well or water flowing in an injection well) as an energy provider and a communication channel to another well location
Data Source
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AI summary
Disclosed are perturbation signaling systems and methods for use in a downhole well. Such systems can include a downhole tool configured to hang from a wellbore anchoring mechanism. The tool can have or associate with an energy harvesting system, a power management system, a sensing system, and a wireless communication system. A turbine generator can encode signals into flowing fluid through electric load and related changes in hydraulic energy, transmitting information through the fluid. A receiver station positioned at another well location can decode and or relay the signals. Signals can bypass impediments such as noise zones by inducing signals in adjacent parallel well environments such as an annulus. The receiver station can accumulate energy from repeated redundant signaling over time to enhance communication and signal resolution. An additional wireless communication system can receive and/or relay data to a remote location.