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.