Because the confining pressure boosts, the increase in resistance to longitudinal crack propagation ends in a gradual changeover of shale failure manner from longitudinal to inclined shear failure that displays an escalation in rock plasticity. When the confining pressure reaches thirty MPa, there are still area shear microcracks across https://wellcontrolprocedures44219.wikitron.com/2435777/top_guidelines_of_rock_mechanics_in_wellbore_stability