关键词: 固液平衡, 原油特征化, 沥青质沉淀, 方法, 改进

Abstract: Characterization is essential to modeling ill-defined systems like crude oil. Based on reasonable physical postulates and some certain mathematical model, a successful characterization model can give a reasonable description of the ill-defined parts of the crude oil,thus satisfying the requirement of reservoir phase calculation and reservoir simulation. with the present characterization methods, crude is taken as a homogeneous phase which is contrary to the fact that the crude is essentially a kind of colloid with resin and asphaltene (solid phase) suspending in it. This results in a big deviation when the present methods are applied to some of heavy oil. A modified characterization method is proposed by considering the solid (resin and asphaltene)-liquid (homogeneous oil phase) equilibrium existing in crude. Calculation of several live oil properties with the modified method was made and much better results are obtained in comparison with the present ones.

Key words: solid-liquid equilibrium, characterizing crude, asphaltene precipitation, method