Fracture gradient (hydraulic fracturing)

Input(s)

$\Delta P_{f}$: Pressure Loss Sourced by Friction (psi)

$\Delta P_{p}$: Pressure Loss sourced by Perforations (psi)

$\Delta P_{h}$: Hydrostatic Pressure Change (psi)

$P_{i n j}$: Injection Pressure (psi)

Output(s)

$G_{f}$: Fracture Gradient $(\mathrm{psi} / \mathrm{ft})$

Formula(s)

$$ G_{f}=\frac{P_{i n j}+\Delta P_{h}-\Delta P_{f}-\Delta P_{p}}{D} $$

Reference(s)

Saydam, T., (1967). Principles of Hydraulic Fracturing, ARI Publishing Co., Page: 25.