Abstract
The NMR multiphase flow measurement method effectively overcomes the shortcomings of the traditional multiphase flow measurement method and has unique advantages in the field of multiphase flow fluid identification and evaluation. Multiphase flow NMR response signals are very weak and highly susceptible to interference from the environment and the instrument itself, so efficient collection of echo signals is particularly critical. Aiming at the characteristics of high frequency, weak intensity and low signal-to-noise ratio of echo signals, a high-precision signal acquisition scheme based on ARM and FPGA architecture and external high-speed A/D conversion is proposed. The reception of the echo signal has intermittent characteristics, and the data of the A/D conversion is buffered by using the dual port RAM, so that the data collected at high speed is not lost. The feasibility and effectiveness of the design were verified by constructing an experimental platform to meet the requirements of high-speed data acquisition for real-time online measurement of nuclear magnetic resonance.
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This paper was prepared for presentation at the 2019 International Field Exploration and Development Conference in Xi’an, China, 16–18 October, 2019.
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Acknowledgments
The project is supported by National Natural Science Foundation of China under Grant (No. 41774081), the Natural science basic research project of Shaanxi Province (No. 2017JM5103) and Doctoral Innovation Fund of Xi’an Shiyou University (No. 2015BS13).
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Yuan, Jf., Li, Lp., Tong, Ms., Han, Rq., Wang, Y. (2020). Design of NMR Multiphase Flow Data Acquisition System. In: Lin, J. (eds) Proceedings of the International Field Exploration and Development Conference 2019. IFEDC 2019. Springer Series in Geomechanics and Geoengineering. Springer, Singapore. https://doi.org/10.1007/978-981-15-2485-1_152
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DOI: https://doi.org/10.1007/978-981-15-2485-1_152
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