Fracture pressure (Hubert and Willis)

Input(s)

SνS_{\nu}: Vertical Stress (psi)

PpP_{p}: Pore Pressure (psi)

Output(s)

Shmin S_{\text {hmin }}: Fracture Pressure (psi)(\mathrm{psi})

Formula(s)

Shmin=0.3( SvPp)+Ppσhminσv=0.3\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.


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