Pressure transientanalysis is one of the powerful tools that provides estimates on insitu reservoir properties. Development of theory since 1935 from the classic paper of Theis, has provided analysis procedures for different pressure tests in wells. The SOlutions to respective partial differential equations for dual porosity or fractured systems also found wide application in estimating reservoir properties in geothermal reservoir s. When we analyze the response of a reservoir to pressure disturbances, we assume a model to simulate the system, and properties are estimated from the best fit to this model. The present paper will discuss some experimental results obtained from a fractured medium with zero matrix permeability, where dimensions of blocks, fracture spacing, exact location of production points and reservoir size are known. The pressure transient data obtained from a laboratory geothermal model, were analyzed using conventional analysis techniques. The results imply, even for this fully fractured system, the reservoir behaves as if it has the properties of a dual porosity medium. Several tests conducted at different rates and at different production depths resulted in similar kh and QCth values, indicating that the parameters affecting the pressure transients were the overall properties of the medium. In this paper only drawdown tests will be presented.

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