Hydrostatic pressure in annulus due to slug
Input(s)
\(\mathrm{V}_{\mathrm{a}}\): Volume of Annulus \((\mathrm{ft} / \mathrm{bbl})\)
\(\mathrm{V}_{\mathrm{s}}\): Volume of Slug \((\mathrm{bbl})\)
\(\mathrm{W}_{\mathrm{s}}\): Slug Weight \((\mathrm{ppg})\)
\(\mathrm{W}_{\mathrm{m}}\): Mud Weight \((\mathrm{ppg})\)
Output(s)
P: Hydrostatic Pressure (psi)
Formula(s)
\[
\mathrm{P}=\mathrm{V}_{\mathrm{a}} * \mathrm{~V}_{\mathrm{s}} *\left(\mathrm{~W}_{\mathrm{s}}-\mathrm{W}_{\mathrm{m}}\right) * 0.052
\]
Reference(s)
Lapeyrouse, N. J., 2002, Formulas and Calculations for Drilling, Production and Workover, Second Edition, Gulf Professional Publishing, Page: 36.