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body--uriencoded--T_%7Bpc%7D

°Rpseudo-critical temperature of the fluid mixture 

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body--uriencoded--p_%7Bpc%7D

psipseudo-critical pressure of the fluid mixture  

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body\gamma_g

DimensionlessGas specific gravity (air = 1)
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p_{pc} = 756.8 -131.07 \, \gamma_g - 3.6 \, \gamma_g^2
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T_{pc} = 169.2 +349.5 \, \gamma_g - 74  \, \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


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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} = 667 - 15.0 \, \gamma_g - 37.5 \, \gamma_g^2
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T_{pc} = 168 +325 \, \gamma_g - 12.5 \, \gamma_g^2



Standing, 1977Total inorganic compounds  = 0%Low molecular weight California natural gases
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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, 1977Total inorganic compounds  = 0%

Low molecular weight California gas condensate

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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)



See also

Natural Science / Physics / Thermodynamics / Thermodynamic system / Pseudo-Critical Point (Tpc, ppc)

[ Fluid Mixture ]

[ Pseudo-Critical Point (Tpc, ppc) ][ Pseudo-Critical Temperature (Tpc) ][ Pseudo-Critical Pressure (Ppc)]

[ Critical Point (Tc, pc) ][ Сritical Temperature Tc ][ Critical Pressure (pc) ]


Reference

  1. Sutton, R.P. 1985. Compressibility Factors for High-Molecular-Weight Reservoir Gases. Presented at the SPE Annual Technical Conference and Exhibition, Las Vegas, Nevada, USA, 22-26 September. SPE-14265-MS. http://dx.doi.org/10.2118/14265-MS

  2. Standing, M. B., Volumetric and Phase Behavior of Oil Field Hydrocarbon Systems, pp. 125–126. Dallas: Society of Petroleum Engineers, 1977.