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A study on slim-hole density logging based on numerical simulation

소구경 시추공에서의 밀도검층 수치모델링 연구

  • Ku, Bonjin (Department of Energy and Mineral Resources Engineering, Sejong University) ;
  • Nam, Myung Jin (Department of Energy and Mineral Resources Engineering, Sejong University) ;
  • Hwang, Seho (Geological Environmental Divion, Korea Institute of Geoscience and Mineral Resources)
  • 구본진 (세종대학교 에너지자원공학과) ;
  • 남명진 (세종대학교 에너지자원공학과) ;
  • 황세호 (한국지질자원연구원 지구환경연구본부)
  • Received : 2012.11.16
  • Accepted : 2012.11.24
  • Published : 2012.11.30

Abstract

In this study, we make simulation of density log using a Monte Carlo N-Particle (MCNP) algorithm to make an analysis on density logging under different borehole environments, since density logging is affected by various borehole conditions like borehole size, density of borehole fluid, thickness and type of casing, and so on. MCNP algorithm has been widely used for simulation of problems of nuclear particle transportation. In the simulation, we consider the specific configuration of a tool (Robertson Geologging Co. Ltd) that Korea institute of geoscience and mineral resources (KIGAM) has used. In order to measure accurate bulk density of a formation, it is essential to make a calibration and correction chart for the tool under considerations. Through numerical simulation, this study makes calibration plot of the density tool in material with several known bulk densities and with boreholes of several different diameters. In order to make correction charts for the density logging, we simulate and analyze measurements of density logging under different borehole conditions by considering borehole size, density of borehole fluid, and presence of casing.

Acknowledgement

Supported by : 한국에너지기술평가원(KETEP)

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