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.