Fracture gradient (Zoback and Healy)

Input(s)

$\mu$: Viscosity $(\mathrm{cP})$

$S_{v}$: Vertical Stress (psi)

$S_{p}$: Pore Pressure (psi)

Output(s)

$S_{\text {hmin }}$: Minimum Horizontal Stress (psi)

Formula(s)

$$ S_{h \min }=\left(\left(\left(\left(1+\mu^{2}\right)^{0.5}\right)+\mu\right)^{-2}\right) *\left(S_{v}-P_{p}\right)+P_{p} $$

Reference(s)

Mark D. Zoback, Reservoir Geomechanics, Cambridge University Press, UK, Page: 281.