The collapse strain and fracture pressure for shale–sandstone were computed across different elastic modulus and Poisson’s ratios to find out the Harmless density window. The Patchy Aircraft of Weakness criterion extends Jaeger’s single weak plane model by similarly dividing the failure of laminated shale into two distinct, discontinuous components. https://yxzbookmarks.com/story21565490/not-known-details-about-rock-mechanics-in-wellbore-stability