Accurately determining reservoir reserves is a cornerstone of reservoir engineering. The material balance method, which leverages actual reservoir performance data, is widely recognized as the most precise technique for estimating initial hydrocarbon volumes.
Traditionally, this method requires multiple well shut-ins to measure average reservoir pressure. However, this practice can be logistically challenging and often insufficient for obtaining accurate pressure readings.
The flowing material balance offers an alternative approach. By utilizing concepts like boundary-dominated flow or pseudo-steady state flow, along with flowing pressures and rates, it enables the estimation of initial hydrocarbon volumes without the need for well shut-ins.
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