Because the confining tension will increase, the rise in resistance to longitudinal crack propagation results in a gradual changeover of shale failure manner 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://andykhbxr.wikiparticularization.com/2414415/5_simple_statements_about_wellbore_breakout_analysis_explained