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This paper presents a modified Lade criterion for wellbore stability predictions, addressing the limitations of the Mohr-Coulomb and Drucker-Prager criteria. The modified criterion accurately describes the influence of intermediate principal stress on rock strength and provides a closed-form solution for critical mud weight with only two required rock strength parameters. It demonstrates that the required increase in mud weight for varying hole angles is less than previously predicted by the established cri

Author

Dullbull

Language

EN