As the confining tension raises, the increase in resistance to longitudinal crack propagation results in a gradual transition of shale failure method from longitudinal to inclined shear failure that reflects an escalation in rock plasticity. In the event the confining pressure reaches 30 MPa, there remain regional shear microcracks https://danteenvag.wikinstructions.com/393100/not_known_details_about_rock_mechanics_in_wellbore_stability