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Gas Properties Equations

Browse 23 gas properties petroleum engineering equations with formulas, inputs, outputs, units, and sources.

Gas Properties equations group related upstream petroleum engineering formulas by workflow so engineers can find the right calculation faster.

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Phase Behavior and ThermodynamicsGas Properties

Beggs-Brill Gas Z-Factor Correlation

z=A+(1-A)e^{-B}+CP_{pr}^{D}

Phase Behavior and ThermodynamicsGas Properties

Corrected Sour Gas Pseudo-Reduced Properties

P'_{pr}=\frac{P}{P'_{pc}}

Phase Behavior and ThermodynamicsGas Properties

Gas Hydrate Dissociation Pressure

p_h=0.1450377\exp\left(\left[\frac{2.50744\times10^{-3}}{(\gamma_h+0.46852)^3}+1.214644\times10^{-2}F_m-4.676111\times10^{-4}F_m^2+0.0720122\right]T+\frac{3.6625\times10^{-4}}{(\gamma_h-0.485054)^3}-5.44376F_m+3.89\times10^{-3}F_m^2-29.9351\right)

Phase Behavior and ThermodynamicsGas Properties

Gas Molecular Weight from Specific Gravity

M_g=28.967\gamma_g

Phase Behavior and ThermodynamicsGas Properties

Generalized Virial Gas Z-Factor Correlation

z=1+\frac{(B^0+\omega B^1)P_{pr}}{T_{pr}}

Phase Behavior and ThermodynamicsGas Properties

Hydrate Formation Temperature from Modified Clapeyron Criterion

T_h=3.89C_h^{0.5}

Phase Behavior and ThermodynamicsGas Properties

Kay Mixing Rule Gas Pseudo-Critical Properties

T_{pc}=\sum_i y_iT_{ci}

Phase Behavior and ThermodynamicsGas Properties

Lee-Gonzalez-Eakin Gas Viscosity

\mu_g=10^{-4}K\exp(X\rho_g^Y)

Phase Behavior and ThermodynamicsGas Properties

Necessary Inhibitor Concentration Required in Liquid Phase to Reduce Hydrate Point

X=\frac{100dM}{dM+2335}

Phase Behavior and ThermodynamicsGas Properties

Papay Gas Z-Factor Correlation

z=1-\frac{3.53P_{pr}}{10^{0.9813T_{pr}}}+\frac{0.274P_{pr}^2}{10^{0.8157T_{pr}}}

Phase Behavior and ThermodynamicsGas Properties

Pseudo-Reduced Conditions

P_r = \frac{P}{(P_{cA}P_{cB})^{0.5}}

Phase Behavior and ThermodynamicsGas Properties

Pseudo-Reduced Gas Properties from Critical Properties

P_{pr}=\frac{P}{P_{pc}}

Phase Behavior and ThermodynamicsGas Properties

Real Gas Density

\rho_g=\frac{P M_g}{zRT}

Phase Behavior and ThermodynamicsGas Properties

Real Gas Isothermal Compressibility with Z-Factor Derivative

c_g=\frac{1}{P}-\frac{1}{z}\left(\frac{dz}{dP}\right)_T

Phase Behavior and ThermodynamicsGas Properties

Real Gas Pseudopressure Derivative

\frac{dm}{dp}=\frac{2p}{\mu_g z}

Phase Behavior and ThermodynamicsGas Properties

Real Gas Pseudopressure Difference for Constant Mu-Z

\Delta m=\frac{p_2^2-p_1^2}{\mu_g z}

Phase Behavior and ThermodynamicsGas Properties

Real Gas Pseudopressure Trapezoidal Increment

\Delta m=\frac{1}{2}(D_1+D_2)(p_2-p_1)

Phase Behavior and ThermodynamicsGas Properties

Specific Gravity of Gas Hydrate Forming Components

\Gamma_h=\frac{m_h}{28.96}

Phase Behavior and ThermodynamicsGas Properties

Standing Dry Gas Pseudo-Critical Properties

T_{pc}=168+325\gamma_g-12.5\gamma_g^2

Phase Behavior and ThermodynamicsGas Properties

Standing Wet Gas Pseudo-Critical Properties

T_{pc}=187+330\gamma_g-71.5\gamma_g^2

Phase Behavior and ThermodynamicsGas Properties

Sutton Pseudo-Critical Gas Properties

T_{pc}=169.2+349.5\gamma_g-74.0\gamma_g^2

Phase Behavior and ThermodynamicsGas Properties

Water Content of Sour Gas

W=yW_{hc}+y_{CO2}W_{CO2}+y_{H2S}W_{H2S}

Phase Behavior and ThermodynamicsGas Properties

Wichert-Aziz Sour Gas Pseudo-Critical Correction

T'_{pc}=T^*_{pc}-\epsilon