Thermodynamic Characterization of Undefined Petroleum Fractions of Gas Condensate using Group Contribution

Veronica Uribe-Vargas, Bernardo Carreón-Calderón, Edgar Ramírez-Jaramillo, Mario Ramírez-de-Santiago
2014 Oil & Gas Science and Technology  
A methodology proposed in a previous paper [Carreo´n-Caldero´n et al. (2012) Ind. Eng. Chem. Res. 51, 14188-14198] for thermodynamic characterization of undefined petroleum fractions was applied to gas-condensate fluids. Using this methodology, input parameters of cubic equations of state and their mixing rules, critical properties and chemical pseudostructures are determined for undefined fractions by minimizing their Gibbs free energy. The results show the feasibility of applying this
more » ... plying this approach to gas-condensate fluids without making use of either cubic equations of state or mixing rules with specific adjusted parameters for petroleum fluids. Besides, it is shown that the phase equilibrium envelopes of gas-condensate fluids are highly dependent on the critical properties assigned to the undefined petroleum fractions of such fluid fractions and less dependent on the equation used for modeling gas-condensate fluids as a whole. The Absolute Average Error (AAE) considering the best arrangement is 1.79% in predicting the dew point. Dv Group volume increment, Equation (13)
doi:10.2516/ogst/2014010 fatcat:rbz4gs7xlvhbpoznsabjlujtye