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Oil Well Production Estimator

Estimate daily oil production with the steady-state Darcy radial-flow equation, then project annual revenue, royalty and net income — using your own reservoir data and oil price.

Reservoir & well inputs
Defaults are typical screening values — replace them with your well's data. Production is computed from physics, so nothing is assumed to be zero.
Economics
Oil price and royalty are your inputs — the tool never fills in a price for you.
Oil royalties vary by country and contract (PSC/JOA). Enter your fiscal term.
Estimated results
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Barrels / day
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Barrels / year
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Net income / year
How this is calculated
Daily rate uses the steady-state Darcy radial-flow equation (oilfield units): q = 0.00708·k·h·(Pe−Pwf) ÷ (μ·B·(ln(re/rw)+s)). Annual production = q × 365 × uptime. Gross revenue = annual production × oil price. Royalty = gross × royalty rate. Operating cost = annual production × cost/bbl. Net income = gross − royalty − operating cost. It is a simplified steady-state screening estimate, not a reservoir-simulation forecast.
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Frequently asked questions
How does the Oil Well Production Estimator calculate flow rate?

It uses the steady-state Darcy radial-flow equation in oilfield units: q = 0.00708 × k × h × (Pe − Pwf) ÷ (μ × B × (ln(re/rw) + s)), where k is permeability in millidarcies, h is net pay thickness in feet, Pe and Pwf are reservoir and bottomhole flowing pressure in psi, μ is oil viscosity in centipoise, B is the formation volume factor, re and rw are drainage and wellbore radius, and s is the skin factor. The result is barrels of oil per day.

How are revenue, royalty and net income estimated?

Annual production is the daily rate multiplied by 365 and your uptime percentage. Gross revenue is annual production times the oil price you enter. Royalty is gross revenue times the royalty rate you enter, and operating cost is your cost per barrel times annual production. Net income is gross revenue minus royalty minus operating cost. Every price and rate is your input, so a missing figure is never treated as zero.

Is this an accurate production forecast?

It is a simplified steady-state estimate for screening and teaching, not a reservoir-simulation forecast. Real wells decline over time and are affected by drive mechanism, water cut and completion. Use it for a first-pass estimate and confirm with a petroleum engineer and current fiscal terms before any decision.

Is it free and which oil price does it use?

Yes, it is completely free with no signup. It does not hardcode an oil price — you enter the price per barrel yourself, so the estimate always reflects the price you choose rather than a stale default.