Continuous Thermodynamics Modeling of Asphaltene Precipitation as Associating System in Crude Oil Mixture

In this work, a new and efficient algorithm for asphaltene deposition modeling through application of association thermodynamic model is introduced. We assume that have a binary system, non-precipitating as crude oil solvent system and precipitating as asphaltene component which pure asphaltene component only participate in deposition phase. For characterization of asphaltenes, used asphaltene segment distribution function and The association term is applied at equilibrium condition and a necessary and sufficient condition is defined to minimize the Gibbs free energy relation and also equality of the fugacity of each liquid and solid phases. Also we used two phase flash calculations with Peng-Robinson and Lee-Kesler EOS for the live and tank crude oil systems to describe asphaltene (association) - crude oil solvent (non-association) mixture which the association parameters of asphaltene component are adjusted with our experimental data at different conditions. Our experimental data from the Iranian crude oil reservoir, in this study were used to examine the proposed asphaltene model. It has been shown that the calculated results are in good agreement with experimental data.

کلیدواژه ها:

Asphaltene precipitation ، Segment distribution function ، Association ، two phase flash calculation