Prediction of Volumetric Properties and (multi-) Phase Behaviour of Asphaltenic Crudes
نویسندگان
چکیده
La floculation des asphaltnes est dcrite comme une transition thermodynamique conduisant la formation d'une nouvelle phase liquide riche en asphaltnes : le dpt asphaltnique. Le modle thermodynamique choisi est l'quation d'tat de PengRobinson associe aux rgles de mlange d'Abdoul et Pneloux fondes sur les contributions de groupes. Le brut est reprsent par 33 pseudo-constituants. La fraction lourde F11+ est reprsente par un pseudo-constituant pour la coupe F11-F20 et 4 pseudo-constituants pour la coupe F20+ : "Sat F20+", "Aro F20+", "Rsines", "Asphaltnes". Les proprits physiques des pseudo-constituants "Sat F20+," "Aro F20+" et "Rsines" sont calcules l'aide des mthodes de contribution de groupes proposes par Avaulle et par Rogalski et Neau, bases sur la connaissance de leur structure molculaire. Les proprits physiques des pseudo-constituants "F11-F20" et "Asphaltnes" sont ajustes afin de reproduire correctement la pression de bulle, les volumes relatifs et les quantits flocules 303 K. Le modle propos donne la proportion et la composition des dpts asphaltniques diffrentes tempratures (303-403 K) et sur une large gamme de pression (0,1-50 MPa), incluant la pression de bulle du brut considr.
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