Enter the pump output and the annular capacity into the calculator to determine the annular velocity.
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Annular Velocity Formula
The following equation is used to calculate the Annular Velocity.
AV = PO / AC
- Where AV is the annular velocity (ft/min)
- PO is the pump output (bbl/min)
- AC is the annular capacity (bbl/ft)
To calculate annular velocity, divide the pump output by the annular capacity.
What is an Annular Velocity?
Definition:
Annular velocity is the average linear velocity of a fluid (typically drilling fluid/mud) moving through the annulus—the space between the drill pipe (or casing/tubing) and the borehole (or outer casing).
How to Calculate ?
Example Problem:
The following example outlines the steps and information needed to calculate the Annular Velocity.
First, determine the pump output. In this example, the pump output is found to be 12.5 bbl/min.
Next, determine the annular capacity. In this case, the annular capacity is measured to be 0.25 bbl/ft.
Finally, calculate the Annular Velocity using the formula above:
AV = PO / AC
AV = 12.5 / 0.25
AV = 50 ft/min
