Because the confining force will increase, the increase in resistance to longitudinal crack propagation leads to a gradual changeover of shale failure mode from longitudinal to inclined shear failure that reflects an escalation in rock plasticity. If the confining pressure reaches 30 MPa, there are still area shear microcracks https://myfirstbookmark.com/story21583475/5-simple-statements-about-wellbore-stability-analysis-explained