Since the confining pressure improves, the increase in resistance to longitudinal crack propagation brings about a gradual changeover of shale failure manner from longitudinal to inclined shear failure that displays an escalation in rock plasticity. If the confining strain reaches 30 MPa, there remain regional shear microcracks within the https://vertechs1.blogspot.com/2025/10/advancing-well-control-how-vertechs-is.html