Abstract
Performance-based reserves can be estimated by the material balance method, rate transient analysis method, or well test method, among others. These methods can be combined depending on the characteristics of the gas reservoirs. For fractured-vuggy carbonate reservoirs, which are characterized by strong heterogeneity, complex fluid properties, multiphase flow in wellbore, production at variable pressure or variable rate, and poor quality of performance data; the traditional material balance method fails to estimate the single-well performance-based reserves. Therefore, a performance-based reserves estimation method integrating well test analysis and advanced production decline analysis is proposed. The new method can be used to effectively estimate the single-well performance-based reserves in fractured-vuggy gas reservoirs. The single-well performance-based reserves, recoverable reserves, and producing reserves estimation methods are illustrated with examples.
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