Abstract: The paper deduces vapor-liquid-solid material balance equations which has their own characterization in line with the generic view about hydrocarbon phase behavior in oil/gas system and the method for characterizing asphaltene components.With three phase algorithm which takes asphaltene precipitation into account,the technique can model asphaltene precipitation quantitatively.Moreover,the paper puts forward the opinion that the incompatibility between asphaltene components and light hydrocarbons can be described with larger interaction coefficients. The paper also presents the calculation technique of reference fugacity,and the matching method to saturation pressure and amount of precipitated asphaltene through the example shown in the paper.

Key words: asphaltene precipitation, fugacity, equation of state, flash calculation, saturation pressure

摘要： 根据对油气烃类体系相态特征的一般性认识与文章中提出的沥青组分特征化方法,导出了与之相应的有其自身特殊性的气液沥青三相相平衡物料平衡方程组.用考虑沥青沉降三相闪蒸数值算法,能对沥青沉降进行有效的量化模拟计算.此外,文章提出了大的交互作用系数可以描述沥青与原油中轻烃不相溶性的观点.结合实例计算,给出了沥青质参考逸度的计算、饱和压力和沥青沉降量的拟合方法.

关键词: 沥青沉降, 逸度, 状态方程, 闪蒸计算, 饱和压力