Gas Viscosity Calculator
Calculate natural gas viscosity using the Lee-Gonzalez-Eakin (LGE) correlation with impurity corrections for N2, CO2, and H2S.
Input Parameters
LGE: μg = (1e-4) K exp(X ρg^Y), with Wichert-Aziz corrections for impurities
Gas Viscosity
--
cp
Gas Density
--
g/cc
Z-Factor
--
Molecular Weight
--
g/mol
Tpc (corrected)
--
°R
Ppc (corrected)
--
psia
Tpr
--
Ppr
--
How this was calculated
Pseudocritical Properties (Sutton): Tpc = 169.2 + 349.5*sg - 74.0*sg^2; Ppc = 756.8 - 131.0*sg - 3.6*sg^2
Wichert-Aziz Correction: e = 120*(A^0.9 - A^1.6) + 15*(B^0.5 - B^4) where A = yH2S + yCO2, B = yH2S
Z-Factor (DAK): Dranchuk-Abou-Kassem correlation solved iteratively.
LGE: K = (9.4 + 0.02*M)*T^1.5 / (209 + 19*M + T); X = 3.5 + 986/T + 0.01*M; Y = 2.4 - 0.2*X; μg = 1e-4 * K * exp(X * ρg^Y)
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Book a free strategy call →Understanding Gas Viscosity in Petroleum Engineering
Gas viscosity is a critical parameter in reservoir engineering, well testing, and pipeline design. Unlike liquids, gas viscosity increases with temperature at low pressures and shows complex behavior at high pressures. The Lee-Gonzalez-Eakin (LGE) correlation, published in 1966, remains one of the most widely used methods for estimating natural gas viscosity in the petroleum industry.
The LGE correlation requires gas density as input, which in turn depends on the Z-factor (gas compressibility factor). This calculator uses the Sutton correlations for pseudocritical properties, the Wichert-Aziz correction for sour gas (H2S and CO2 content), the Dranchuk-Abou-Kassem (DAK) correlation for Z-factor, and finally the LGE equation for viscosity. All calculations run entirely in your browser. Built by Groundwork Analytics.