Material balance in oil reservoirs

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The material-balance equation is the simplest expression of the conservation of mass in a reservoir. The equation mathematically defines the different producing mechanisms and effectively relates the reservoir fluid and rock expansion to the subsequent fluid withdrawal. The applicable equation for initially saturated volatile- and black-oil reservoirs is[1][2][3][4] Most of the equations regarding primary drive mechanisms for oil reservoirs apply to any consistent set of units. A few equations, however, are written assuming English or customary units. Nfoi and Gfgi are related to the total original oil in place (OOIP) and original gas in place (OGIP),N and G, according to N Nfoi Gfgi Rvi and G Gfgi N foi Rsi.

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