DefinePK

Abstract

The importance of the average reservoir pressure in all phases of the hydrocarbon industry implies to conduct continues research for better calculations of this property. In this paper the pseudo steady-state pressure solution in hydraulically fractured wells combined with a better determination of the effective wellbore radius is used to provide accurate estimations of the average reservoir pressure. These solutions initially presented for homogeneous formations are also extended to naturally fractured reservoirs and expressions for reservoir shape factors and average reservoir pressure are introduced for flow, pressure buildup and multi-rate tests for either liquids or gas reservoirs. The expressions are successfully tested with synthetic examples and compared to calculations from material balance given absolute deviation errors lower than 0.25 %.