Minimum pressure p_b required to start developing hydraulic fracture in a given rock:
| (1) | {\rm FBP} = p_b = 3 \, \sigma_{h, \rm min} - \sigma_{h, \rm max} + \sigma_t - p_i |
where
\sigma_{h, \rm min} | minimal principal horizontal stress |
\sigma_{h, \rm max} | maximal principal horizontal stress |
\sigma_{t} | tensile stress |
p_i | initial formation pressure |
See Also
Petroleum Industry / Upstream / Well / Well-Reservoir Contact (WRC) / Hydraulic fracture