Annular Velocity Calculator
Annular Velocity Calculator converts flow rate to fluid velocity through a single pipe bore or the annulus between two concentric tubulars, and solves the inverse — the flow rate needed to hit a target velocity. Includes a commonly cited 150-200 ft/min hole-cleaning reference range for a quick sanity check against typical practice.
How It Works
Velocity (ft/min) = 19.25 × flow rate (gpm) ÷ flow-path area (in²) — the standard field-unit relation, applied to either a single pipe bore or the annulus between two tubulars.
See every formula worked through in detail on the Completion Engineering Formulas reference.
When You'd Use It
Before circulating or tripping, engineers check whether a planned pump rate keeps annular velocity in an effective hole-cleaning range — or work backward from a target velocity to the rate needed to hit it.
Key Features
Available Now
Fully built and ready to use — get in touch to purchase access.