Annular velocity - Using pump output in bbl/min

Input(s)

Q: Circulation Rate (gpm)

$D_{h}$: Inside Diameter of Casing or Hole Size (in.)

$D_{p}$: Outside Diameter of Pipe, Tubing or Collars (in.)

Output(s)

AV: Annular Velocity (ft/min)

Formula(s)

$$ A V=\frac{[24.5 * Q]}{\left[\left(D_{h}\right)^{2}-\left(D_{p}\right)^{2}\right]} $$

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: 10.