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Darcy PI flow — rate from J and drawdown, or back-calculate J from a test.
Results
Drawdown ΔP
800 psi
Liquid rate
2,000 STB/d
Productivity index
2.50 STB/d/psi
Estimated rate ≈ 2000 STB/d at 800 psi drawdown (J = 2.50 STB/d/psi). Non-Darcy or multiphase effects need deliverability or VLP/IPR coupling.
engineeringEngineering screening only. Engineering screening calculator only — not a substitute for licensed professional engineering, API/ASME/code-compliant design, certified reserves audits, regulatory well approvals, or field-measured PVT and flow data. Verify all inputs, units, and correlations against your facility standards and qualified sign-off before operations or design decisions.
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Build deliverability curves, nodal analysis, and forecast tables — open Workspace with Caleb for multiphase and non-Darcy guidance when signed in.
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Productivity index summarizes stabilized radial flow into a wellbore. It is invaluable for quick rate checks when reservoir pressure and flowing BHP are trusted.
High-rate gas or fractured wells often depart from Darcy PI — deliverability exponents and coupled IPR/VLP models come next.
Use this for screening. Spreadsheet Studio stores the tables; agents help when you need interpretation memos after sign-in.
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