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Numerical Analysis of Borehole Stability Depending on Drilling Fluid

Drilling Fluid를 적용한 시추공의 안정성에 대한 수치해석

Chun-won Sin1*
,
Chung-Sik Yoo2
신 춘원1*
,
유 충식2
1 Member, the master´s course, School of Civil and Environmental Engineering, Sungkyunkwan Univ.
2Member, Professor, School of Civil and Environmental Engineering, Sungkyunkwan Univ.
*교신저자. *Corresponding Author. 
30 June 2017. pp. 183-194
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Abstract

When a borehole is drilled, the load distributed by the removal is taken to re-establish equilibrium. As a result, the stresses around the borehole is redistributed. If there is no hydrostatic support pressure by drilling fluid (mud) introduced into the borehole, failure in the formation may take place. The mud pressure boundary that keeps the borehole stable is defined as a mud window. To predict the potential for failures around the borehole, a series of numerical analysis were performed and compared with a mud window. The effect of failure criterion and the intial stress ratio adopted on the mud window was also studied.

Keywords
Poroelasticity analysis
Mud window
Drilling fluid
Borehole

지반을 굴착하여 시추공을 형성할 때 공벽을 중심으로 응력의 재분배가 이루어지고 이 때 시추 안정액을 활용하여 공벽에 응력의 평형을 이룸으로써 공벽의 안정성을 유지한다. 시추공 내에 주입하는 시추 안정액이 시추공의 안정성을 유지하기 위한 압력의 상한과 하한의 범위를 Mud window라고 정의하고 다양한 이론에 의해 계산된다. 본 연구에서는 수치해석을 활용하여 시추공의 안정성을 분석하여 Mud window를 작성하고 이론값과 비교 분석하여 모델링에 대한 검증을 수행하였다.

References
1
Saeed Salehi, Geir Hareland and Runar Nygaard (2010), “Numerical simulations of wellbore stability in under-balanced- drilling wells”, Journal of Petroleum Science and Engineering, Volume 72, Issue 3-4, pp.229-235.
2
Al-Ajmi and Zimmerman (2006), “Stability analysis of vertical boreholes using the Mogi–Coulomb failure criterion”, International Journal of Rock Mechanics & Mining Sciences, Volume 43, Issue 8, pp.1200-1211.
3
X. Wang and R. L. Sterling (2007), “Stability analysis of a borehole wall during horizontal directional drilling”, Tunnelling and Underground Space Technology, Volume 22, pp.620-632.
4
Lianyang Zhang, M. ASCE and Radha KC (2010), “Stability Analysis of Vertical Boreholes Using a Three-Dimensional Hoek-Brown Strength Criterion”, Civil Engineering and Engineering Mechanics, pp.283-292.
5
Shahoo Maleki, Raoof Gholami, Vamegh Rasouli, Ali Moradzadeh, Reza Ghavami Riabi and Farhad Sadaghzadeh (2014), “Comparison of different failure criteria in prediction of safe mud weigh window in drilling practice”, Earth-Science Reviews, Volume 136, pp.36-58.
6
Davis, E. H. (1968), “Theories of plasticity and the failure of soil masses”. Soil mechanics: Selected topics, Butterworth`s London, pp.341-380.
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Drucker, J.M and Prager, W. (1952), “Soil Mechanics and Plastic Analysis in Limit Design”, Quarterly of Applied Mathmatics, Volume 10, No.2, pp.157-165.
Information
  • Publisher :Korean Geosythetics Society
  • Publisher(Ko) :한국지반신소재학회
  • Journal Title :Journal of the Korean Geosynthetics Society
  • Journal Title(Ko) :한국지반신소재학회 논문집
  • Volume : 16
  • No :2
  • Pages :183-194
  • Received Date : 2017-01-12
  • Revised Date : 2017-06-21
  • Accepted Date : 2017-06-22
  • DOI :https://doi.org/10.12814/jkgss.2017.16.2.183
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