In this particular research, two requirements are used: the Mohr–Coulomb (M–C) criterion and the multi-weak-airplane toughness criterion for shale formations. These are generally used to carry out analysis and realize the optimization in the failure standards for shale–sandstone interbedded reservoirs. Mechanical tests serves for a foundational phase in figuring https://vertechs70257.wikinewspaper.com/4724235/wellbore_stability_issues_an_overview