Advances in computing hardware and software have provided the reservoir engineer with a wide range of alternatives in analyzing and projecting reservoir behavior. The ability to economically run large simulation models offers a means to generate more accurate technical answers and to develop full-field models of larger, more complex reservoirs. However, there are still situations, due either to reservoir complexity or size, in which full-field models will not be practical. Therefore, detailed segment models will continue to be an important part of reservoir behavior analysis and development planning, and there is still a need for approximate approaches, such as the use of pseudo relative permeability and capillary pressure functions.

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