The collapse strain and fracture stress for shale–sandstone were computed throughout varying elastic modulus and Poisson’s ratios to find out the Protected density window. As illustrated in Figure nine, if the rock’s elastic mechanical parameters approximate isotropy, the effects in the transversely isotropic model established On this examine exhibit https://vertechs21.wixsite.com/vertechs21/post/innovations-in-mpd-drilling-revolutionizing-well-control