Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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Experimental study of the influence of borehole parameters on prompt fission neutron uranium logging and its corrections

  • Pengfei Zhou (School of Electrical Engineering, University of South China) ;
  • Bin Tang (Engineering Research Center of Nuclear Technology Application, Ministry of Education, East China University of Technology)
  • Received : 2023.12.12
  • Accepted : 2024.03.06
  • Published : 2024.08.25
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Abstract

In prompt fission neutron uranium logging, borehole environmental parameters affect the measured results and must be corrected. In order to explore the influence of borehole parameters on the interpretation of logging results, this paper builds a sandstone type uranium ore block model to simulate the field production drilling device based on the "Epithermal/Thermal neutron counting rate ratio" (E/T) theory. The effects of borehole diameter, thickness of iron tube and well fluid on the decay rate of epithermal and thermal neutrons and their uncertainty correction methods were investigated. The results show that the effect of borehole diameter on E/T is negligible. The iron tube thickness has a certain effect on the moderation and absorption of epithermal and thermal neutrons, and its E/T increases slightly with increasing thickness. The influence of iron tube thickness on E/T is corrected and the relative uncertainty is less than 5%. The well fluid thickness also affects the decay rate of epithermal and thermal neutrons, and its E/T follows the law of negative exponential attenuation. The influence of well fluid thickness on E/T is corrected and the relative uncertainty is less than 5%. This study provides technical guidance for field well survey of uranium deposit.

Keywords

Acknowledgement

This work was supported by the National Natural Science Foundation of China (No.12075055), State Administration of Science, Technology and Industry for National Defence "13th Five-Year Plan" nuclear energy development and research project (No.20201192). Furthermore, we are very grateful for the support of Airborne Survey and Remote Sensing Centre of Nuclear Industry.

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