Given that the confining pressure boosts, the increase in resistance to longitudinal crack propagation results in a gradual changeover of shale failure mode from longitudinal to inclined shear failure that reflects an escalation in rock plasticity. Once the confining pressure reaches 30 MPa, there remain neighborhood shear microcracks throughout https://social4geek.com/story7256758/what-does-wellbore-stability-in-drilling-mean