Reservoir simulation results may be presented in terms of asset net present value. This may be used to make decisions regarding alternative production strategies or in-fill drilling programs based upon economic criteria. If the simulation and value assessment is performed for a number of possible realizations of the reservoir geological model an estimate is also obtained of the risk involved in each production decision made. Ideally, optimal strategies for all realizations should be compared, rather than one tuned to a single possibility.

Such a system implies a fast reservoir flow simulation engine. One possibility is to use a streamline solver. These yield simulation results quickly, but introduce significant approximations in the treatment of gravity and viscosity changes. An alternative is to use a fast finite difference or finite element simulator. We compare the results obtained using these methods, in economic terms as well as in terms of production profiles.

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