Annular Velocity for a Given Circulation Rate Formula |
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| \( AV \;=\; \dfrac{ 24.5 \cdot Q }{ C_{id}^2 - C_{od}^2 } \) | ||
| Symbol | English | Metric |
| \( AV \) = Annular Velocity | \(ft\;/\;min\) | - |
| \( Q \) = Circulation Rate | \(gpm\) | - |
| \( C_{id} \) = Casing ID | \(in\) | - |
| \( C_{od} \) = Casing OD | \(in\) | - |
Annular velocity is the speed at which the drilling fluid (mud) travels up the annulus between the drill pipe and the borehole wall.
