The collapse strain and fracture stress for shale–sandstone ended up computed across various elastic modulus and Poisson’s ratios to determine the Secure density window. The PPW criterion better reveals the strength of shale with different bedding angles. During this review, the JPW and PPW conditions are made use of https://wellcontrolmethods49257.wikicorrespondence.com/6904981/wellbore_stability_issues_an_overview