As being the confining stress raises, the rise in resistance to longitudinal crack propagation leads to a gradual changeover of shale failure method from longitudinal to inclined shear failure that reflects an escalation in rock plasticity. Once the confining tension reaches thirty MPa, there are still regional shear microcracks https://johnnynlizg.wiki-promo.com/1613867/about_wellbore_stability_in_drilling
Wellbore stability in drilling - An Overview
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