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Stability analysis of vertical boreholes using the Mogi-Coulomb failure criterion
KTH, School of Architecture and the Built Environment (ABE), Land and Water Resources Engineering, Engineering Geology and Geophysics.
KTH, School of Architecture and the Built Environment (ABE), Land and Water Resources Engineering, Engineering Geology and Geophysics.
2006 (English)In: International Journal of Rock Mechanics And Mining Sciences, ISSN 1365-1609, E-ISSN 1873-4545, Vol. 43, no 8, 1200-1211 p.Article in journal (Refereed) Published
Abstract [en]

A main aspect of wellbore stability analysis is the selection of an appropriate rock failure criterion. The most commonly used criterion for brittle failure of rocks is the Mohr-Coulomb criterion. This criterion involves only the maximum and minimum principal stresses, a, and sigma(3), and therefore assumes that the intermediate stress 92 has no influence on rock strength. As the Mohr-Coulomb criterion ignores the strengthening effect of the intermediate stress, it is expected to be too conservative in estimating the critical mud weight required to maintain wellbore stability. Recently, Al-Ajmi and Zimmerman [Relationship between the parameters of the Mogi and Coulomb failure criterion. Int J Rock Mech Min Sci 2005;42(3):431-39.] developed the Mogi-Coulomb failure criterion, and showed that it is reasonably accurate in modelling polyaxial failure data from a variety of rocks. We then develop a model for the stability of vertical boreholes, using linear elasticity theory to calculate the stresses, and the fully-polyaxial Mogi-Coulomb criterion to predict failure. Our model leads to easily computed expressions for the critical mud weight required to maintain wellbore stability.

Place, publisher, year, edition, pages
2006. Vol. 43, no 8, 1200-1211 p.
Keyword [en]
failure criteria, Mogi failure criterion, Drucker-Prager failure criterion, polyaxial test data, wellbore stability
National Category
Civil Engineering
Identifiers
URN: urn:nbn:se:kth:diva-37387DOI: 10.1016/j.ijrmms.2006.04.001ISI: 000241609800003Scopus ID: 2-s2.0-33748523012OAI: oai:DiVA.org:kth-37387DiVA: diva2:433596
Available from: 2011-08-10 Created: 2011-08-10 Last updated: 2017-12-08Bibliographically approved

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