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Drilling EngineeringDrilling Hydraulics

Annular Velocity from Pump Output Calculator

AV=24.5QDh2−Dp2AV = \frac{24.5Q}{D_h^2 - D_p^2}

Enter pump output and annular area or the required geometry inputs. The calculator returns average annular velocity.

Tabular solver

Inputs

Defaults provide a quick field-unit example for the equation.

3 variables

Calculation runs locally with the shared TypeScript engine.

Formula reference

Annular velocity from pump output estimates the average drilling-fluid velocity in the annulus from flow rate and annular area.

View formula, units, and source

Assumptions

  • Flow rate is steady during the calculation.
  • The annular area represents the section being evaluated.
  • Velocity is an average value, not a local velocity profile.

Common mistakes

  • Using pipe ID instead of annular area.
  • Comparing average velocity directly to critical transport limits without considering inclination and rheology.