Downhole Vibration Power Generation With Low Flow Restriction
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Solution Overview
Problem
Conventional downhole power generation devices in the oil and gas industry face challenges such as blockages in tubing, corrosion, and limited reliability due to exposure to downhole fluids, which affect fluid flow and the lifespan of the devices.
Innovation Solution
A downhole electrical power generation device is designed with a magnetic element array, where only the member is exposed to downhole fluid, and the electrically conductive element is positioned within a magnetic field to generate power through vibration, using a Halbach array configuration to optimize magnetic field distribution and minimize exposure to corrosive fluids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional downhole power generation devices (turbines or oscillating pistons) are used, then power can be generated downhole, but they cause blockages in tubing, affect fluid flow and expose moving surfaces to corrosion and wear
Solution Approach 1:
The patent replaces conventional mechanical power generation systems (turbines with rotating blades, oscillating pistons with moving parts) with a magnetic vibration-based system. A magnetic element vibrates in response to fluid flow, inducing electrical current in a coil without mechanical contact. This substitution eliminates bearings, seals, and other moving surfaces that are prone to corrosion and wear in downhole environments, thereby improving reliability while maintaining power generation capability
Solution Approach 2:
The invention extracts the power generation function from mechanical components and isolates it to a magnetic element that vibrates in the fluid flow. By taking out the mechanical transmission elements (shafts, bearings, seals) and retaining only the essential vibration-inducing magnetic element, the system achieves power generation with minimal exposure to corrosive fluids, resolving the contradiction between power generation and reliability
2Power
If conventional power generation devices are used, then power can be generated, but they significantly restrict downhole fluid flow
Solution Approach 1:
The magnetic element is designed as a thin, flexible structure that can vibrate in response to fluid flow without creating significant flow resistance. Unlike rigid turbine blades or pistons that obstruct flow, the flexible magnetic element allows fluid to pass through with minimal restriction while still generating sufficient vibration for power generation, thus maintaining productivity
3Use of energy by moving object
If batteries are used to power downhole tools, then power can be provided to tools, but battery size, life and replacement difficulty are challenging issues
Solution Approach 1:
The system enables self-powered operation by harvesting energy directly from the downhole fluid flow. The magnetic element continuously converts kinetic energy from the flowing fluid into electrical energy, allowing the downhole tool to power itself indefinitely as long as fluid flows through the wellbore. This eliminates the need for finite-capacity batteries and their associated replacement issues
Solution Approach 2:
The invention changes the energy supply paradigm from stored chemical energy (batteries with fixed capacity) to continuous kinetic energy conversion from fluid flow. This parameter change from finite to renewable energy source fundamentally extends the operational duration from battery life limits to the lifetime of the well production itself
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 solution provides a robust and resilient power generation system that does not significantly restrict fluid flow, extends the lifespan of downhole tools by reducing the need for batteries, and allows for longer-term operation in harsh environments.
Implementation Method 1
the electrically conductive element is configured to be positioned such that the electrically conductive element is located in a magnetic field produced by the at least one magnetic element to generate electrical power on vibration of the member
Implementation Method 2
a member configured to be positioned within downhole fluid and to vibrate when the downhole fluid flows across a surface of the member
Data Source
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AI summary
A downhole electrical power generation device is provided. The device comprises at least one magnetic element; an electrically conductive element; and a member configured to be positioned within downhole fluid and to vibrate when the downhole fluid flows across a surface of the member. One of the magnetic element and electrically conductive element is positioned on the member. The other of the magnetic element and electrically conductive element is configured to be positioned such that the electrically conductive element is located in a magnetic field produced by the at least one magnetic element to generate electrical power on vibration of the member. A method of generating electrical power downhole is further provided. The method comprises: positioning one of at least one magnetic element and an electrically conductive element on a member of a downhole power generation device; positioning the other of the magnetic element and electrically conductive element such that the electrically conductive element is located in a magnetic field produced by the at least one magnetic element; positioning the member in a flow of downhole fluid the member vibrating when the downhole fluid flows across a surface of the member; and generating electrical power in the electrically conductive element on vibration of the member in fluid flow.