Electromagnetic Induction Coupling for Downhole Power Transfer
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Solution Overview
Problem
Conventional methods for establishing electrical communication with out-of-casing components in oil and gas operations are costly and inefficient, as they require the installation of wires and cables in the annular space between downhole tubulars and wellbores, which is challenging and expensive to maintain.
Innovation Solution
The use of primary and secondary circuits employing electromagnetic induction, where a magnetically permeable primary circuit inside a downhole tubular induces a magnetic flux through a magnetically permeable secondary circuit outside the tubular, allowing for the transfer of power and data without the need for direct wiring, utilizing zones of high and low magnetic permeability to optimize the magnetic coupling and reduce efficiency losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional wiring methods are used to establish electrical communication with out-of-casing components, then reliable power and data transfer can be achieved, but the installation cost and system complexity increase significantly
Solution Approach 1:
The patent replaces the mechanical wiring system with an electromagnetic induction system. A primary winding inside the tubular and a secondary winding outside the tubular create magnetic coupling to transfer power and data signals without physical wire connections, eliminating the need for complex wiring installation and maintenance in the annular space
Solution Approach 2:
The patent introduces magnetic flux as an intermediary between the primary and secondary circuits. The magnetic field generated by the primary winding couples with the secondary winding through the tubular wall, enabling indirect electrical communication that avoids the need for direct wire connections through the complex annular space
2Ease of operation
If wires and cables are installed in the annular space between downhole tubular and wellbore, then electrical communication with sensors is established, but installation and maintenance costs become prohibitive
Solution Approach 1:
The patent eliminates the mechanical wiring installation process by using electromagnetic induction. Power and data are transferred wirelessly through the tubular wall via magnetic coupling between primary and secondary windings, removing the need for costly wire and cable installation in the annular space
Solution Approach 2:
The patent extracts the electrical connection function from the physical wiring system. By separating the primary winding (inside tubular) from the secondary winding (outside tubular) and using magnetic coupling, the system removes the need for physical wires to traverse the difficult-to-access annular space
3Device complexity
If electromagnetic induction is used to transfer power and data through the tubular wall, then wiring complexity is reduced, but magnetic coupling efficiency may be lost
Solution Approach 1:
The patent optimizes magnetic coupling efficiency by adjusting key parameters including the permeability of the tubular wall material, the spacing and geometry of the windings, and the frequency of the alternating current. These parameter changes maximize the magnetic flux linkage between primary and secondary windings while minimizing energy losses
Solution Approach 2:
The patent employs composite material structures in the tubular wall with specific magnetic properties to enhance coupling efficiency. The tubular material is selected or engineered to have optimal magnetic permeability that facilitates magnetic flux transmission while reducing eddy current losses and other inefficiencies
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 method enables efficient and cost-effective electrical communication with out-of-casing sensors and electronics, reducing the need for extensive wiring and minimizing efficiency losses during power and data transfer, thus optimizing the monitoring of oil and gas reservoirs.
Implementation Method 1
supplying electrical power and/or data to the primary winding with an electrical source so that a magnetic flux is channeled through the primary and secondary cores to induce an electromotive force in the secondary winding
Implementation Method 2
a magnetically permeable primary core and a primary winding extending proximate the primary core; and a magnetically permeable secondary core and a secondary winding extending proximate the secondary core
Data Source
AI summary
A method and system according to which electrical communication is established between a primary circuit positioned inside a downhole tubular and a secondary circuit positioned outside the downhole tubular. In an exemplary embodiment, the method includes positioning the secondary circuit outside the downhole tubular, the secondary circuit including a magnetically permeable secondary core and a secondary winding extending proximate the secondary core; positioning a primary circuit inside the downhole tubular, the primary circuit including a magnetically permeable primary core and a primary winding extending proximate the primary core; and supplying electrical power and/or data to the primary winding with an electrical source so that a magnetic flux is channeled through the primary and secondary cores to induce an electromotive force in the secondary winding, thus establishing electrical communication between the primary and secondary circuits to transfer power and/or data therebetween.