Pressure required to induce a tensile fracture (breakdown pressure)
Input(s)
\(\mathrm{S}_{\mathrm{hmax}}\): Maximum Principal Stress in reservoir (psi)
\(\mathrm{S}_{\mathrm{hmin}}\): Minimum Principal Stress in reservoir \((\mathrm{psi})\)
\(P_{p}\): Pore Pressure (psi)
\(\mathrm{T}_{\mathrm{o}}\): Minimum Hoop Stress for formation at which crack initiates (psi)
Output(s)
\(\mathrm{P}_{\mathrm{b}}\): Breakdown Pressure \((\mathrm{psi})\)
Formula(s)
\[
\mathrm{P}_{\mathrm{b}}=3 * \operatorname{Shmin}-\operatorname{Shmax}-\mathrm{P}_{\mathrm{p}}+\mathrm{T}_{\mathrm{o}}
\]
Reference(s)
Mark D. Zoback, Reservoir Geomechanics, Cambridge University Press, UK, Page: 56.