Oil & Gas Engineering Calculators
PVT, productivity index, skin factor, decline, orifice flow, hoop stress, and pipe pressure drop.
Screening calculators for reservoir and facility engineers. Educational estimates only — verify with licensed PE review for field decisions.
Petroleum PVT & Bubble Point Calculator
Estimate bubble-point pressure and oil PVT properties (Rs, Bo) with Standing (1977) — field units for reservoir and production screening.
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Well Productivity Index Calculator
Compute liquid rate q = J(Pr − Pwf) or productivity index from a stabilized well test — reservoir engineering screening.
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Darcy Skin Factor Calculator
Calculate skin factor from stabilized test rate or estimate liquid rate from skin — oilfield Darcy radial flow screening.
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Hyperbolic Decline & EUR Calculator
Hyperbolic decline curve calculator for oil and gas — estimate rate, Np, and EUR to a cutoff rate with Arps b-factor.
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Gas Orifice & Choke Flow Calculator
Estimate gas rate through a choke or orifice plate — choked vs subcritical flow with discharge coefficient and gas properties.
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Hoop Stress & Wall Thickness Calculator
Pressure vessel and pipe hoop stress with ASME VIII Div 1 style required thickness — mechanical engineering screening.
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Euler Column Buckling Calculator
Euler column buckling for slender members — critical load and effective length with standard end conditions.
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Pipe Pressure Drop Calculator
Estimate pipe pressure drop in psi from flow rate and pipe geometry.
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Engineering Unit Converter
Convert pressure and petroleum volumes — psi to bar, bbl to m³, scf to sm³.
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