Abstract

This paper provides a accurate method for dividing drilling debris. Firstly, K, Th and U counting rates of different drilling debris samples were measured by low background gamma spectrometer, and the relationship between sample quality and counting rate was obtained. Secondly, mudstone and limestone can be classified by the lithologic identification method. Finally, the specific lithology of mudstone can be divided by the relation of K, Th and U counting rates. Experiments have shown the accuracy of lithological discrimination of drilling debris by this method is up to 80%.

Highlights

  • Gamma spectrometry is a fast and non-destructive method for measuring radionuclide activity in drilling debris

  • The low background gamma spectrometer is used to measure drilling debris samples, find out the relationship between the characteristic parameters of gamma spectrometry and rock properties, and judge the rock properties of drilling debris based on the results of gamma spectrometry measurement[2]

  • Experimental results and discussions 3.1 Selection of measuring energy zone The samples used in this paper are mainly drilling debris, which belong to mudstone and limestone in sedimentary rocks

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Summary

Introduction

Gamma spectrometry is a fast and non-destructive method for measuring radionuclide activity in drilling debris. Radionuclides in drilling samples emit gamma rays when they decay. Quantitative and qualitative analysis of radionuclides is carried out by measuring gamma energy and irradiation rated[1]. The low background gamma spectrometer is used to measure drilling debris samples, find out the relationship between the characteristic parameters of gamma spectrometry and rock properties (lithology), and judge the rock properties of drilling debris based on the results of gamma spectrometry measurement[2].

Results
Conclusion

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