Because the confining tension will increase, the increase in resistance to longitudinal crack propagation ends in a gradual changeover of shale failure method from longitudinal to inclined shear failure that displays an escalation in rock plasticity. If the confining pressure reaches 30 MPa, there are still community shear microcracks https://listedirectory.com/listings1162858/the-5-second-trick-for-wellbore-stability-in-drilling
What Does Shale wellbore stability Mean?
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