For a naturally fractured reservoir the existence of two semi-log straight lines when analysing real pressure transient data is seldom observed and some existing models for interpretation of fractured systems have always been subjected to controversy. In this study an analysis of pressure transient data taken in wells completed in fractured reservoirs in Western Venezuela has shown the existence of two well-defined parallel semilog straight lines which confirms the Warren and Root model from a practical viewpoint. The data was analysed using the typecurve corresponding to the solutions for a well with wellbore storage and skin in a reservoir with double porosity (pseudo-steady state flow). The analysis provides values for the dimensionless fractured storage parameter, w and the dimensionless matrixfracture permeability ratio, A which are considered to be representative of a two-porosity system. Finally, a production forecast analysis is made for the reservoir using the obtained values of w and A·
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