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Abstract
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In this work, the authors introduce an association asphaltene deposition modeling through application
of continuous thermodynamics for crude oil mixture. It is assumed that a binary system forms consist
of a nonprecipitating crude oil solvent system and a precipitating asphaltene component in which pure
asphaltene component only participate in deposition phase. A simple association factor as an association
term has been incorporated in set of equations forminimization of Gibbs free energy, which was obtained
from molecular weight distribution (fractional molecular weight) and association ability of system. For
characterization of asphaltenes, asphaltene segment distribution function and the association term are
applied at equilibrium condition. The association parameters of asphaltene component are adjusted with
the experimental data at different conditions. In this study, experimental data from the Iranian crude oil
reservoir was used to examine the proposed asphaltene model. It has been shown that the calculated
results are in good agreement with experimental data.
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