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Practical application of failure criteria in determining safe mud weight windows in drilling operations

Journal of Rock Mechanics and Geotechnical Engineering 2014年第1期6卷 13-25页

作者： R.Gholam A.Moradzadeh V.Rasoul J.Hanach Department of Mining Petroleum and Geophysics Shahrood University of Technology Departmentof Petroleum Engineering Curtin University Geological Division Iranian Offshore Oilfield Company

Wellbore instability is reported frequently as one of the most significant incidents during drilling *** of wellbore instability includes estimation of formation mechanical properties and the state of in situ *** this analysis,the only controllable parameter during drilling operation is the mud *** the mud weight is larger than anticipated,the mud will invade into the formation,causing tensile failure of the *** the other hand,a lower mud weight can result in shear failures of rock,which is known as borehole *** predict the potential for failures around the wellbore during drilling,one should use a failure criterion to compare the rock strength against induced tangential stresses around the wellbore at a given mud *** Mohr–Coulomb failure criterion is one of the commonly accepted criteria for estimation of rock strength at a given state of ***,the use of other criteria has been debated in the *** this paper,Mohr–Coulomb,Hoek–Brown and Mogi–Coulomb failure criteria were used to estimate the potential rock failure around a wellbore located in an onshorefield of *** log based analysis was used to estimate rock mechanical properties of formations and state of *** results indicated that amongst different failure criteria,the Mohr–Coulomb criterion underestimates the highest mud pressure required to avoid breakouts around the *** also predicts a lower fracture gradient *** addition,it was found that the results obtained from Mogi–Coulomb criterion yield a better comparison with breakouts observed from the caliper logs than that of Hoek–Brown *** was concluded that the Mogi–Coulomb criterion is a better failure criterion as it considers the effect of the intermediate principal stress component in the failure analysis.

关键词： mud weight windows Failure criterion Breakout Fracturing Intermediate principal stress

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