`"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 Math / Science

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)

---

Pumping Calculators

• 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