Gas Injection: Rigorous Black-Oil or Fast Compositional Model?

The possibility to have a rigorous black-oil model, previously calibrated on a well defined compositional model, can<br>represent a useful instrument to perform daily faster simulations. In fact full compositional simulation reliability is<br>conditioned by a proper space-time discretization on a well characterized reservoir and by an equation of state with an<br>enough detailed pseudo-composition of the reservoir fluid. On the contrary, compositional models are usually coupled with<br>any effort to reduce their CPU times: equations of state with fewer components, coarser grid blocks describing a too<br>homogeneous reservoir. Therefore an extended black-oil model, properly calibrated on a well refined compositional model<br>can be even more reliable than to dispose only of a “reduced” compositional model. The method is a development of a<br>previous one 1 and its application is valid for oil reservoirs reasonably far from critical conditions so as modified black-oil 2, 3<br>treatments are not required.