Formation Fracture Gradient

The hydrostatic value expressed in psi/ft. that is required to initiate a fracture in a subsurface formation (geologic strata).

Source: API RP 59, Recommended Practice for Well Control Operations, Second Edition, May 2006. Global Standards

Source: API RP 64, Recommended Practice for Diverter Systems Equipment and Operations, Second Edition, November 2001 (March 1, 2007). Global Standards


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