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.