Capacity formulas - gal/ft

Input(s)

$\mathrm{d}_{\mathrm{h}}$: Inside Diameter of Casing (in.)

$\mathrm{d}_{\mathrm{p}}$: Outside Diameter of Casing (in.)

Output(s)

AC: Annular Capacity (gal/ft)

Formula(s)

$$ \mathrm{AC}=\frac{\mathrm{d}_{\mathrm{h}}^{2}-\mathrm{d}_{\mathrm{p}}^{2}}{24.51} $$

Reference(s)

Lapeyrouse, N. J., 2002, Formulas and Calculations for Drilling, Production and Workover, Second Edition, Gulf Professional Publishing, Page: 12.