Annular velocity - Using circulation rate in Gpm

Input(s)

Q: Circulation Rate (Pump Output) (gpm)

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

$\mathrm{D}_{\mathrm{p}}$: Outside Diameter of Pipe, Tubing or Collars (in.)

Output(s)

AV: Annular Velocity (ft/min)

Formula(s)

$$ \mathrm{AV}=\frac{24.5 * \mathrm{Q}}{\left(\mathrm{D}_{\mathrm{h}}^{2}\right)-\left(\mathrm{D}_{\mathrm{p}}^{2}\right)} $$

Notes: The Formula Calculates Annular Velocity (ft/min) using Circulation Rate (Pump Output) (gal/min)

Reference(s)

Lapeyrouse, N. J., 2002, Formulas and Calculations for Drilling, Production and Workover, Second Edition, Gulf Professional Publishing, Page: 10.