Abstract
Summary This paper presents a grouping method that optimizes compositional description so that the modeling of the progressive phase behavior of injection gas and reservoir oil systems requires less computation. The method allows the retrieval of the full composition to select new groups for further calculations with very little effort and almost no extra computational time. A new mixing rule, based on the parameters of an equation of state (BOS), also has been developed and incorporated into the grouping method. Multistage experiments simulating the progressive compositional variations of injection gases and reservoir oils were used to evaluate the proposed grouping method.
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