DOI QR코드

DOI QR Code

The impact of sidetracking on the wellbore stability

  • Elyasi, Ayub (Department of Mining Engineering, Tarbiat Modares University) ;
  • Goshtasbi, Kamran (Department of Mining Engineering, Tarbiat Modares University)
  • Received : 2014.12.16
  • Accepted : 2015.02.11
  • Published : 2015.05.25

Abstract

In the past sidetracking was the means to bypass a damaged zone or to correct the direction of a wellbore. Nowadays, this method is very common and useful in relocating the bottom of a wellbore in a more productive zone and consequently enhancing the production of a reservoir by saving a significant amount of time and money. In this paper, the stability of the bend area is assessed considering varied conditions of stress regime and sidetrack orientation. In general, the stress regime and the orientation of the principal stresses have negligible effect on the stability of the sidetrack compared to sidetrack inclination. On the other hand, the sidetrack deviation angle from the vertical main well plays the major role in the stability of the bend area.

Keywords

References

  1. Al-Ajmi, A. (2006), "Wellbore stability analysis based on a new true-triaxial failurecriterion", Ph.D. Thesis, Department of Petroleum Engineering, Sultan Qaboos University, Muscat, Oman.
  2. Bensvik, T. (2006), Relieving the pressure, Drilling & Well Technologies, Worldexpro.
  3. Schlumberger (2011), Sidetrack Horizontal Well in Low-Quality Reservoir Produces Triple the Oil Expected, www.slb.com/drilling.
  4. Drnec, M.L. and Przhegalinsky, I. (2008), "Horizontal extended reach re-entry drilling of sidetracks at sakhalin island increases oil production from mature oil fields", IADC/SPE Drilling Conference, Orlando, Florida, USA.
  5. Hudya, F.D., Natalia, S. and Castillo, D. (2007), "The effect of pressure depletion on geomechanical stress and fracture behavior in Gunung Kembang Field", Thirty-First Annual Convention and Exhibition, Proceedings, Indonesian Petroleum Association.
  6. Itasca Consulting Group (2006), FLAC3D, Student License Inc., USA.
  7. LUKOIL (2010), "Oil Field development and production", Annual Report.
  8. McLellan, P.J., Smith, S.P. and Hawkes, C.D. (2002), "Coupled modeling of borehole instability and multiphase flow for underbalanced drilling", IADC/SPE Drilling Conference, Dallas, Texas, USA.
  9. Mohiuddin, M.A., Khan, K., Abdulraheem, A., Al-Majed, A. and Awal, M.R. (2006), "Analysis of wellbore instability in vertical, directional, and horizontal wells using field data", J. Petroleum Sci. Eng., 55, 83- 92.
  10. Oil and Gas Well Drilling and Servicing eTool, www.osha.gov.
  11. Sagle, B., Sanchez, E. and Seale-Smith, R. (2001), "Sidetracking and drilling in one trip-case histories and economical analysis", AADE National Drilling Technical Conference, American Association of Drilling Engineers, Houston, Texas.
  12. Soliman, M.Y. and Boonen, P. (2000), "Rock mechanics and stimulation aspects of horizontal wells", J. Petroleum Sci. Eng., 25,187-204. https://doi.org/10.1016/S0920-4105(00)00012-7