Geomechanics and FracturingIn-Situ Stress and Rock Mechanics

Normal Tangential Hoop Stress Near a Wellbore

Sg_{th}=\frac{1}{2}(S_{hmax}+S_{hmin}-2P_o)\left(1+\frac{R^2}{r^2}\right)-\frac{1}{2}(S_{hmax}-S_{hmin})\left(1+\frac{3R^4}{r^4}\right)\cos(2\theta)-P_o\frac{R^2}{r^2}-S_{dt}

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