New volume translated SRK and PR equations of state have been developed to improve density predictions of hydrocarbons at extremely high temperature, high pressure (HTHP) conditions associated with ultra-deep petroleum formations. Rather than correlating the volume-correction to saturated liquid densities, as is done in most prior volume translation methods, the volume-translation term in the HTHP VT-SRK EoS and HTHP VT-PR EoS is correlated to pure component, single-phase density literature data at HTHP conditions. The mean absolute percentage deviation (MAPD) values of 1-2% obtained with the HTHP VT EoSs are substantially better than those calculated with other models. The proposed models have been successfully extended to mixtures. Good results have been obtained for density calculations of several binary mixtures. The new proposed HTHP equations of state have been used in conjunction with the friction theory viscosity model (f-theory) to accurately model the viscosity of hydrocarbons.

Density and viscosity of hydrocarbon fluids at extreme conditions-modeling and measurements

243rd National Meeting (2012)

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