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Quantifying motional dynamics in nuclear magnetic resonance logging.
Keelan T O'Neill1, Timothy A J Hopper2, Einar O Fridjonsson1
1Department of Chemical Engineering, University of Western Australia, Crawley, WA 6009, Australia.
Tool motion significantly impacts nuclear magnetic resonance (NMR) logging measurements. Simulations show lateral motion causes more signal loss, and optimizing tool design reduces motion sensitivity.
Area of Science:
- Geophysics
- Petrophysics
- Nuclear Magnetic Resonance (NMR)
Background:
- NMR logging quantifies formation porosity and fluid volumes.
- Tool motion during logging can degrade measurement accuracy.
- Wireline and logging while drilling (LWD) are primary conveyance methods.
Purpose of the Study:
- To quantify the impact of tool motion on NMR logging measurements.
- To investigate different motion profiles (linear, harmonic) and their effects.
- To identify design parameters for mitigating motion sensitivity.
Main Methods:
- Detailed electromagnetic and spin dynamic simulations were performed.
- Various motion profiles (axial linear, axial harmonic, lateral harmonic) were introduced.
- Signal attenuation was analyzed based on motion characteristics.
Main Results:
- Lateral motion causes greater signal attenuation than axial motion.
- Increased motion magnitude amplifies signal attenuation.
- Harmonic motion frequency interacts with measurement frequency, causing complex interference.
- Reduced magnetic field gradient and echo spacing decrease signal attenuation.
Conclusions:
- Tool motional dynamics significantly affect NMR logging performance.
- Optimizing design parameters like magnetic field gradient and echo spacing can control motion sensitivity.
- Understanding these dynamics is crucial for accurate geophysical evaluations.
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