Differential hydrostatic pressure between cement in the annulus and mud inside the casing

Input(s)

$\mathrm{h}_{\mathrm{w}}$: Well Depth (ft)

$\mathrm{h}_{\mathrm{f}}$: Float Collar (Feet Number Above the Shoe) (ft)

$\mathrm{h}_1$: Lead Slurry Depth (ft)

$\mathrm{h}_{\mathrm{t}}$: Tail Slurry Depth (ft)

$\mathrm{w}_{\mathrm{m}}$: Mud Weight (lb/gal)

$\mathrm{w}_{\mathrm{l}}$: Lead Slurry Weight (lb/gal)

$\mathrm{w}_{\mathrm{t}}$: Tail Slurry Weight (lb/gal)

Output(s)

$\mathrm{P}_{\mathrm{a}}$: Total Pressure in Annulus (psi)

$\mathrm{P}_{\mathrm{c}}$: Total Pressure in Casing (psi)

$\mathrm{P}_{\mathrm{d}}$: Total Pressure Differential (psi)

Formula(s)

Reference(s)

Lyons, W. C., Carter, T., and Lapeyrouse, N. J., 2012, Formulas and Calculations for Drilling, Production and Workover, Third Edition, Gulf Professional Publishing, Page: 84.