Abstract
ABSTRACT Evidence of complex phase behavior has been observed in many CO2-hydrocarbon systems at relatively low temperatures (about 100°F). The phase behavior includes two hydrocarbon liquid phases and a vapor phase. In some cases a hydrocarbon solid phase (a precipitate) is observed. Combining these four phases with an aqueous phase suggests that accurate modeling of a CO2 flood should account for five phases. From a practical perspective, the input data and computer requirements of such a simulator would be extensive, and could be excessive. An attempt to evaluate the expected effect of an additional hydrocarbon phase on CO2 miscible simulation was made using a four-phase (no solid phase) simulator. Three CO2-hydrocarbon systems were evaluated. It was found in the cases studied that the presence of two hydrocarbon liquid phases, under optimum conditions, changed the recovery factor by only a few percent.
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