As the confining pressure raises, the increase in resistance to longitudinal crack propagation leads to a gradual changeover of shale failure mode from longitudinal to inclined shear failure that displays an escalation in rock plasticity. When the confining tension reaches 30 MPa, there are still local shear microcracks round https://clickinghere99753.westexwiki.com/2375686/not_known_facts_about_wellbore_stability_issues