This paper examines the effect of unequal initial layer pressures on the pressure and sandface rate responses of wells producing from commingled reservoirs. The main objective is to provide techniques and methodology to determine individual layer permeabilities and skin factors in commingled reservoirs with unequal initial pressures. The layer information obtained early in the life of the reservoir is very important for planing production schedule and economic decisions concerning the future of the wells.

The emphasis of this research is on the study of the wellbore performance during pre-production which is the period after completion but before any production on surface. The results of this study provide a useful foundation for the design of well test procedures to ensure that individual layer properties are measured adequately. As the pre-production well test requires no production on the surface, the environmental impact caused by flaring oil or gas during a conventional well test is alleviated.

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