Stripping/snubbing calculations - Maximum Allowable surface pressure governed by casing burst pressure

Input(s)

$W_{o}$: Mud Weight behind casing (ppg)

$W_{u}$: Mud Weight in use (ppg)

$\mathrm{H}$: Casing Shoe TVD $(\mathrm{ft})$

$P_{b c}$: Casing Burst Pressure (psi)

S: Safety Factor (e.g., 80\% represent 0.8 ) (dimensionless)

Output(s)

MASP: Maximum Allowable Surface Pressure governed by Casing Burst Pressure (psi)

Formula(s)

$$ M A S P=\left(P_{b c} * S\right)-\left(W_{u}-W_{o}\right) * 0.052 * H $$

Reference(s)

Formulas and Calculations for Drilling, Production and Workover, Second Edition, Lapeyrouse, Page: 143.