Black Oil Partially Miscible Three-Phase Model Based on the Black Oil Assumptions. More...
Collaboration diagram for Black Oil:
Detailed DescriptionPartially Miscible Three-Phase Model Based on the Black Oil Assumptions. The black-oil model is a three-phase, three-component model widely used for oil reservoir simulation. The phases are denoted by lower index ("water", "gas" and "oil") and the components by upper index ("Water", "Gas" and "Oil"). The model assumes partial miscibility:
The densities of the phases are determined by so-called formation volume factors:
Since the gas and water phases are assumed to be immiscible, this is sufficint to calculate their density. For the formation volume factor of the the oil phase determines the density of saturated oil, i.e. the density of the oil phase if some gas phase is present. The composition of the oil phase is given by the gas dissolution factor , which defined as the volume of gas at atmospheric pressure that is dissolved in a given amount of oil at reservoir pressure:
This allows to calculate all quantities required for the mass-conservation equations for each component, i.e.
where is the filter velocity of the phase . By default is determined by using the standard multi-phase Darcy approach, i.e.
although the actual approach which is used can be specified via the SET_TYPE_PROP(MyProblemTypeTag, FluxModule, Ewoms::ForchheimerFluxModule<TypeTag>);
The primary variables used by this model are:
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