Halbach Array Magnetic Coupling for Downhole Power Harvesting
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Solution Overview
Problem
The power harvesting devices used in downhole applications are prone to erosion and fouling by fines in the production fluid, which can lead to reduced efficiency and reliability.
Innovation Solution
The implementation of a magnetic coupling mechanism using a Halbach Array to enhance the torque capacity and power output of the power harvesting device, while keeping it separated from the erosive produced formation fluid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the power harvesting device is placed in the production flow passage to generate electric power, then power generation capability is improved, but the device is exposed to erosion and fouling by fines in the production fluid
Solution Approach 1:
The power harvesting device is segmented into two separate chambers: a first chamber that interfaces with the production fluid and a second chamber that houses the power generation components. This segmentation allows the fluid-facing components to be exposed to production fluid while the sensitive power generation components remain protected from erosion and fouling.
Solution Approach 2:
A magnetic coupling mechanism acts as an intermediary between the two chambers, transferring rotational motion and torque from the turbine in the first chamber to the power generation components in the second chamber without direct mechanical connection. This intermediary approach allows power transfer while maintaining physical separation and protection from the erosive fluid environment.
2Reliability
If a magnetic coupling mechanism is used to separate the power harvesting device from the erosive fluid, then reliability is improved, but torque capacity and power output are reduced
Solution Approach 1:
The magnetic coupling mechanism utilizes composite magnetic structures with optimized material properties to strengthen the magnetic flux density across the non-magnetic separation barrier. By employing composite magnetic materials and optimized geometric configurations, the system maintains high torque capacity despite the physical separation required for protection.
Solution Approach 2:
The magnetic coupling system transitions from direct mechanical contact in one dimension to magnetic field interaction across a separation barrier in another dimension. This dimensional transition allows the system to overcome the limitations of direct coupling while maintaining effective torque transfer through the non-magnetic separation.
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 solution effectively separates the power harvesting device from the erosive fluid, reducing the risk of fouling and increasing the reliability and efficiency of the power generation in downhole applications.
Implementation Method 1
utilize a magnetic coupling mechanism to strengthen/direct magnetic flux in a downhole flow control valve coupler and power generator
Implementation Method 2
The plurality of magnets in the rotor are arranged in a Halbach Array
Implementation Method 3
The turbine assembly can include a turbine body with a plurality of turbine blades, a turbine hub, and at least one hub magnet
Implementation Method 4
a magnetic coupling mechanism using a Halbach Array to enhance the torque capacity and power output of the power harvesting device, while keeping it separated from the erosive produced formation fluid
Data Source
AI summary
A magnetic coupling mechanism in a downhole flow control tool comprising a first chamber within a flow path of wellbore fluids with a first component comprising a Halbach array of magnets. A second chamber isolated from the wellbore environment comprises a second component with a Halbach array of magnets. The first chamber and the second chamber are coupled with a nonmagnetic separation. The second component is translated with the first component by a strong magnetic flux produced by the array of magnets.