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Drill Science PPFG Calculator Drill Science ~ Pore Pressure Worksheet

Pore Pressure / Fracture Gradient Worksheet

PP = obg - (obg - nhg) * (valo / valn )EE

FG = PP + (obg - PP) * poi / (1 - poi)


Constants

Constant Name Value
Overburden Gradient (psi/ft)
Normal Hydrostatic Gradient (psi/ft)
Equation Exponent
  • Conductivity = -1.2
  • Resistivity = 1.2
  • Sonic = -3.0
  • Velocity = 3.0


Data Values

True Vertical Depth
(feet)
Observed Log Value Normal Log Value Pore Pressure
(psi/ft)
Fracture Gradient
(psi/ft)