# 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.