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The downhole circumferential scanning magnetic resonance imaging tool
Wei Liu1, Lizhi Xiao2, Guangzhi Liao1
1State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China.
Magnetic Resonance Imaging
|October 23, 2018
Summary
This study introduces a downhole circumferential scanning magnetic resonance logging tool for detailed reservoir imaging. The technology provides 3D data for enhanced formation evaluation and fluid property analysis.
Area of Science:
- Geophysics
- Petroleum Engineering
- Nuclear Magnetic Resonance
Background:
- Downhole logging tools are crucial for formation evaluation.
- Existing 2D magnetic resonance techniques have limitations in capturing full reservoir characteristics.
- Accurate imaging of fluid saturation and properties is essential for hydrocarbon exploration.
Purpose of the Study:
- To detail the design principles and electronic control system of a novel downhole circumferential scanning magnetic resonance logging device.
- To demonstrate the capability of 3D data acquisition for improved formation evaluation.
- To explore new applications in reservoir characterization.
Main Methods:
- Utilizing a phase-controlled excitation device with a combined array antenna structure.
- Performing mutual coupling analysis based on inductance coupling principles for antenna decoupling and compensation.
- Acquiring 3D data in axial, radial, and circumferential directions.
Main Results:
- Successful design and implementation of the circumferential scanning magnetic resonance logging device.
- Achieved decoupling and energy discharge compensation for array antennas.
- Demonstrated the potential for 3D imaging of stratum saturation and fluid properties.
Conclusions:
- The downhole circumferential scanning magnetic resonance logging technique offers a significant advancement over 2D methods.
- This technology enables azimuth determination of borehole fluids and imaging of pore structure and reservoir fluids.
- It holds potential for new applications in detailed reservoir characterization and formation evaluation.
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