Given that the confining stress improves, the rise in resistance to longitudinal crack propagation leads to a gradual changeover of shale failure manner from longitudinal to inclined shear failure that reflects an escalation in rock plasticity. Once the confining tension reaches 30 MPa, there remain local shear microcracks around https://abcblogdirectory.com/listings1104678/what-does-shale-wellbore-stability-mean