Oil and gas production across a producing reservoir may vary in a complex manner that is unrelated to any one physical property. Such variations relate to properties which together can be called reservoir heterogeneity. Some forms of heterogeneity can sometimes be resolved by classical geologic and engineering methods, but often the variability is not resolvable because of incomplete data, poor reservoir pressure analysis, or simply because the reservoir heterogeneity is beyond resolution as dictated by well spacing or well distribution. Thus, a new composite reservoir well testing model is a necessary tool to obtain more pertinent data for future studies. This composite reservoir model has the variation of fluid viscosities in two different zones. Hence, the fluids distribution information can be obtained with the pressure testing analysis. The composite reservoir can model reservoirs with a fluid bank, reservoirs with a water flooding front, and reservoirs with steam or a miscible flooding front.

When the reservoir heterogeneity of different formations can be more accurately defined, then fracture stimulation and well specing can be planned in a more manageable fashion. The production manager and engineer will be able to optimize production and infill drilling. The above objectives will definitely help West Virginia's current and future energy challenges.

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