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p_{pc} = 756.8 -131.07 \, \gamma_g - 74 \, \gamma_g^2


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T_{pc} = 169.2 +349.5 \, \gamma_g - 3.6 \, \gamma_g^2


Sutton, 1985

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body0.57< \gamma_g <1.68

H2S = 0%

N2  < 1%

CO2  < 1%

High molecular weight gases

rich in heptanes

  • minor amount of carbon dioxide and nitrogen
  • no hydrogen sulfide



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    p_{pc} = 709.604 - 58.718 \, \gamma_g


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    T_{pc} = 170.491 +307.344 \, \gamma_g


    Guo and Ghalambor (2005)

    H2S < 3%

    N2 < 5%

    Total inorganic compounds < 7%



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    p_{pc} = 706 - 51.7 \, \gamma_g - 11.1 \, \gamma_g^2


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


    Standing, 1981Total inorganic compounds  = 0%

    Low molecular weight California natural gases


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    p_{pc} = 787.06 - 147.34 \, \gamma_g - 7.916 \, \gamma_g^2


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    T_{pc} = 149.18 +358.14 \, \gamma_g - 66.976 \, \gamma_g^2


    Elsharkawy et al. (2000)


    Retrograde gases and condensates


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    p_{pc} = 678 - 50\, (\gamma_g - 0.5) - 206.7 \, y_{N_2} + 440 \, y_{CO_2} + 606.7 \, y_{H_2S}


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    T_{pc} = 326 +315.7 \, (\gamma_g -0.5) - 240 \, y_{N_2} - 83.3 \, y_{CO_2} + 133.3 \, y_{H_2S}


    Ahmed (1989)



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