Pipe & Annular Capacity Calculator
Capacities drive bottoms-up times, kill sheets, cement jobs and trip sheets. Get pipe and annular capacities, volumes and strokes in seconds.
Formulas
Pipe capacity
Cap (bbl/ft) = ID² / 1029.4Annular capacity
Cap (bbl/ft) = (Dh² − OD²) / 1029.4Strokes
Strokes = Volume / Pump outputWorked example
GIVEN
- 8-1/2" hole, 5" DP
- Length 10,000 ft
- Pump output 0.1 bbl/stk
WORKING
- Cap = (72.25 − 25) / 1029.4 = 0.0459 bbl/ft
- Volume = 459 bbl
Bottoms-up ≈ 4,590 strokes
FAQ
Where does 1029.4 come from?
It converts inches² × ft to barrels: 1 bbl = 9,702 in³ ÷ (π/4 × 12).
Run it with your well data
Field & Metric units, works offline, save and share results with your crew.
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Reference only. Always verify against your company procedures and well-control certification.