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Radial Darcy flow — skin from drawdown test or rate from assumed skin.
Steady-state radial Darcy flow with skin — back-calculate skin from a drawdown test or estimate rate from assumed skin.
Results
Skin factor
5,341.36
Drawdown
800 psi
kh (md·ft)
50.0
Skin factor s ≈ 5341.36 from 800 STB/d at 800 psi drawdown. Positive s indicates damage; negative s suggests stimulation. Build IPR/VLP in Spreadsheet Studio for full deliverability.
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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Positive skin suggests damage — drilling, completion, or scale. Negative skin hints at stimulation. Either way, PI alone hides the story.
Back-calculating skin from a drawdown test is standard screening before building full deliverability models.
This calculator uses steady-state Darcy radial flow. Spreadsheet Studio and Caleb extend it to multiphase IPR and facility constraints.
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