Journal of Ocean Engineering and Technology (한국해양공학회지)

Korean Society of Ocean Engineers (한국해양공학회)
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An Experimental Study of Cuttings Transport in Directional Slim Hole Drilling

방향성 소구경 굴착의 입자 이송특성에 관한 연구

  • 한상목 (한국조선해양기자재연구원 전북분원) ;
  • 김정환 (한국조선해양기자재연구원 전북분원) ;
  • 황영규 (성균관대학교 기계공학부) ;
  • 우남섭 (한국지질자원연구원 광물자원연구본부) ;
  • 김영주 (한국지질자원연구원 광물자원연구본부)
  • Received : 2011.11.30
  • Accepted : 2012.04.19
  • Published : 2012.04.30
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Abstract

During drilling, the precipitation velocity of cuttings within an annulus depends on the density and configuration of the cuttings, and on the density, viscosity, and rheological characteristics of the drilling fluid. In directional drilling in particular, it is difficult to adjust and control the cuttings. In contrast to vertical drilling, it is very important to evaluate the flow characteristics of a drilling flow field. However, research on the transfer features of cuttings is inadequate. In this study, in order to identify transfer features of cuttings, an experiment was performed under wide-ranging conditions by constructing a slim hole annulus ($44mm{\times}30mm$) device. In this experiment, the particle volume fraction were influenced by particle size, particle concentration within the flow, pipe rotation, flow volume, and inclination of the annulus. In addition, a mathematical formula for volumetric concentration was deduced and compared to the test results and behavior of cuttings under the other drilling condition was made to be predicted. Therefore, this study can provide meaningful data for vertical and horizontal drilling, and for directional drilling.

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References

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