Surface test pressure required to frac the formation

Input(s)

$F G$: Fracture Gradient $(\mathrm{psi} / \mathrm{ft})$

$D$: Depth $(\mathrm{ft})$

$\rho$: Mud Density (ppg)

Output(s)

$P_{S T}$: Surface Test Pressure (psi)

Formula(s)

$$ P_{S T}=(F G \cdot D)-(0.052 \cdot \rho \cdot D) $$

Reference(s)

Suman Jr, G. O., \& Ellis, R. C. (1977). Cementing Handbook. World Oil, Page: 69.