THERMODYNAMIC MICELLIZATION MODEL OF ASPHALTENE PRECIPITATION FROM PETROLEUM FLUIDS

A thermodynamic micellization model is proposed for the description of asphaltene precipitation from petroleum fluids. It describes the solu bilization of asphaltene polar species by resin bipolar molecules in t he micelles. A simple form of the standard Gibbs free energy of micell ization is used The petroleum fluid is assumed to be a dilute solution with respect to the monomeric asphaltenes, resins, and micelles. The Peng - Robinson equation of state (PR-EOS) is applied to describe the fugacity of monomelic asphaltene in the bulk of the petroleum fluid. I ntermicellar interactions as well as osmotic pressure effects are negl ected. The proposed model shows promising results to describe asphalte ne deposition from crude mixtures. It predicts the change in precipita tion power of different alkane precipitants and the effect of pressure on asphaltene precipitation. The amount and the onset of predicted as phaltene precipitation are sensitive to the amount of resins in the cr ude. All these results are in line with laboratory observations and oi l-field data.