Enter the pump output and the annular capacity into the calculator to determine the annular velocity.

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, multiply the pump output by the annular capacity.

What is an Annular Velocity?

Definition:

An annular velocity measures the linear rate of fluid (typically oil) moving through an annular drilling setup.

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 12.5bbl/min.

Next, determine the annular capacity. In this case, the annular capacity is measured to be .25 bbl/ft.

Finally, calculate the Annular Velocity using the formula above:

AV = PO * AC

AV = 12.5 * .25

AV = 3.125 ft/min