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J. Ocean Eng. Technol. > Volume 26(2); 2012 > Article
J. Ocean Eng. Technol. 2012;26(2):20-25.    
DOI: https://doi.org/10.5574/KSOE.2012.26.2.020   

An Experimental Study of Cuttings Transport in Directional Slim Hole Drilling
Han Sang-Mok,Kim Jeong-Hwan,Hwang Young-Kyu,Woo Nam-Sub,Kim Young-Ju
Jeollabuk-do Branch Institute KOMERI,Jeollabuk-do Branch Institute KOMERI,School of Mechanical Engineering Sungkyunkwan University,Mineral Resource Research KIGAM,Mineral Resource Research KIGAM
방향성 소구경 굴착의 입자 이송특성에 관한 연구
한상목,김정환,황영규,우남섭,김영주
한국조선해양기자재연구원 전북분원,한국조선해양기자재연구원 전북분원,성균관대학교 기계공학부,한국지질자원연구원 광물자원연구본부,한국지질자원연구원 광물자원연구본부
Copyright © 2012 The Korean Society of Ocean Engineers     Open access / Under a Creative Commons License
Key Words: Directional drilling, Slim hole drilling, Drilling fluid, Cuttings, Solid-liquid two phase flow
핵심용어: 방향성굴착, 소구경굴착, 굴착유체, 굴착암편, 고-액 2상 유동
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 ($44mm{ imes}30mm$) 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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