Flat Metallic Strip Toroidal Coil for Downhole Impedance Mismatch
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Solution Overview
Problem
Traditional toroidal coils used in downhole tools for geological formation analysis suffer from high impedance mismatch due to numerous wire windings, limiting their operating frequency range and effectiveness in measuring electrical resistivity and data transmission.
Innovation Solution
The toroidal coil design features wide, spirally wound electrically conductive metallic strips around a ferromagnetic ring, reducing the number of windings and impedance mismatch, enabling higher frequency operation and efficient data transmission and power delivery through an azimuthally polarized magnetic field.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional wire windings are used to create toroidal coils, then magnetic-flux leakage is avoided, but impedance mismatch increases and operating frequency range is limited
Solution Approach 1:
The patent changes the physical parameters of the coil winding by transitioning from traditional round wire to flat metallic strips. This parameter change reduces the number of windings needed while maintaining magnetic flux containment, thereby reducing impedance mismatch and enabling higher operating frequencies without sacrificing magnetic-flux leakage prevention
Solution Approach 2:
The patent employs a composite structure combining ferromagnetic core material with flat metallic strip windings. This composite approach allows the coil to maintain effective magnetic coupling while reducing the total length of conductor needed, thus lowering impedance and expanding the usable frequency range beyond what traditional wire windings achieve
2Reliability
If a large number of wire windings are used, then magnetic-flux leakage is minimized, but device complexity and manufacturing difficulty increase
Solution Approach 1:
By changing the winding geometry from round wire to flat metallic strips, the patent reduces the number of windings required to achieve the same magnetic flux containment. This parameter change simplifies the overall device structure and reduces manufacturing complexity while maintaining reliable magnetic coupling
Solution Approach 2:
The patent extracts only the essential function of magnetic flux containment from the traditional multi-turn wire winding approach. By using flat metallic strips, it achieves effective magnetic coupling with fewer turns, removing the excess complexity associated with traditional wire winding while preserving the core functionality
3Reliability
If traditional wire wound coils are used, then magnetic coupling is maintained, but operating frequency is limited
Solution Approach 1:
The patent changes the electrical parameters of the coil by using flat metallic strips instead of round wire. This reduces the inductance and impedance of the coil, allowing it to operate at higher frequencies while maintaining effective magnetic coupling through the ferromagnetic core
Solution Approach 2:
The patent enables the toroidal coil to dynamically adapt to higher frequency operations by using flat metallic strips that provide lower inductance. This allows the system to operate effectively across a broader frequency spectrum, from low frequency applications to high frequency data transmission and power delivery
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 design enhances the operating frequency range and reduces impedance mismatch, allowing for more accurate resistivity measurements and effective data communication or power transmission in geological formations, improving the efficiency of downhole tools.
Implementation Method 1
the toroidal coil mounted on the drilling collar may induce an azimuthally polarized, oscillating magnetic field into a geological formation to determine the electrical resistivity of the geological formation
Implementation Method 2
the toroidal coil may also serve to communicate a data stream via wireless telemetry, or the toroidal coil may serve to transport electric power to a remote location
Data Source
AI summary
A downhole device may include a closed ring of ferromagnetic material mounted on a conductive pipe. The downhole device may also include a first coil spirally wound around the closed ring comprising an electrically conductive flat metallic strip to substantially cover the closed ring.