Prediction of volumetric properties and (multi)-phase behaviour of asphaltenic crudes

摘要

Asphaltenes flocculation is described as a thermodynamic transition inducing the formation of a new liquid phase with a high asphaltenic content; this phase being the asphaltenic deposit. The thermodynamic model selected is the Peng-Robinson Equation of State associated with the Abdoul and Peneloux group Contribution mixing rules. The oil is modeled by 33 pseudocomponents. Mainly, the heavy F_11+ residue is represented as one pseudocomponent for The F_11-F_20 cut and as 4 pseudocomponents for the F_20+ cut: ＂Sat F_20+＂, ＂Aro F_20+＂, ＂Pesins＂ and ＂Asphaltenes＂.