Fracture pressure (Hubert and Willis)
Input(s)
\(S_{\nu}\): Vertical Stress (psi)
\(P_{p}\): Pore Pressure (psi)
Output(s)
\(S_{\text {hmin }}\): Fracture Pressure \((\mathrm{psi})\)
Formula(s)
\[
\begin{gathered}
\mathrm{S}_{\mathrm{hmin}}=0.3 *\left(\mathrm{~S}_{\mathrm{v}}-\mathrm{P}_{\mathrm{p}}\right)+\mathrm{P}_{\mathrm{p}} \\
\frac{\sigma_{h \min }}{\sigma_{v}}=0.3
\end{gathered}
\]
Notes: Fracture Pressure Is assumed to be Equal to Minimum Horizontal Stress.
Reference(s)
Mark D. Zoback, Reservoir Geomechanics, Cambridge University Press, UK, Page: 281.