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`"Av (ft/min)" = (24.5*Q)/(Dh^2 - Dp^2) `

Enter a value for all fields

The **Annular Velocity** calculator computes the speed of a fluid's movement in an annulus while pumping based on the pump output (**PO**), the inner diameter of the pipe (**ID**), and the outer diameters of the drill pipe (**OD**)

**INSTRUCTIONS:** Choose units and enter the following:

- (
**Q**) Pump output which is the flow rate of the pump. - (
**Dh**) Size of the hole, the inner diameter. - (
**Dp**) Outer diameter of the drill pipe.

**Annular Velocity (AV):** The calculator returns the fluid velocity in feet per minute. However, this can be automatically converted to other velocity units (e.g. meters per second) via the pull-down menu.

The formula for the Annular Velocity is :

` AV =(24.5 "ft"/(gal*"in"^2) * Q )/(Dh^2 - Dp^2) `

where:

- AV = Annular Velocity
- Q = pump output (flow rate)
- Dh = hole size (inner diameter)
- Dp = drill pipe (outer diameter)

- Volume Pumped over time by Pump Flow-rate
- Time to Pump Volume by Flow-rate
- Duplex Pump Output: Barrels per stroke from a duplex pump.
- Triplex Pump Output: Barrels per stroke from a triplex pump.
- Quintuplex Pump Output: Barrels per stroke from a quintuplex pump.
- Barrel Production: Computes the total volume (barrels) produced over a period of time based on the production rate and duration.
- Annular Velocity: Compute the fluid flow velocity, based on the flow rate and pipe dimensions.
- Mud Buoyancy: Computes the buoyancy in mud
- Volume of a Pipe: Computes the volume of a pipe.
- Weight of Pipe Contents: Computes the weight (mass) based on density and pipe dimensions.
- Density of Oil:
- Crude at (48° API): 790.0 kg/m³
- Crude at (40° API): 825.0 kg/m³
- Crude at (35.6° API): 847.0 kg/m³
- Crude at (32.6° API): 862.0 kg/m³

- Energy in Crude Oil: 5800000.0 BTU/bbl
- Pump Efficiency