Production and processing operations of crude oil require a thorough understanding of phase behavior. To model asphaltenes, we need to know more about their phase behavior. The model has to incorporate the interaction of asphaltene and oil in terms of solubility in oil and the suspension characteristics attributed to resin.

This paper reports a comprehensive phase behavior study for five wells from the Middle East was performed as part of an asphaltene precipitation study. The study outlined several important concepts and detailed procedures for modeling asphaltene phase behavior using WinProp, which uses the Nghiem model for asphaltene precipitation

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