The drilling annular velocity is the speed at which the drilling fluid flows through the annular space between the drill string and the borehole wall. It is a critical parameter for ensuring proper cuttings removal and maintaining wellbore stability.
Annular Velocity for a Given Pump Output Formula |
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| \( AV \;=\; \dfrac{ P_o \cdot 1029.4 }{ C_{id}^2 - C_{od}^2 }\) | ||
| Symbol | English | Metric |
| \( AV \) = Annular Velocity | \(bbl\;/\;min\) | - |
| \( P_o \) = Pump Output | \(bbl\;/\;min\) | - |
| \( C_{id} \) = Casing ID | \(in\) | - |
| \( C_{od} \) = Casing OD | \(in\) | - |
