Geothermal well testing is the only way of investigating the physical properties of the reservoir rock as well as the dynamic properties of the fluid flowing both through the wellbore and the reservoir. It is known that Petroleum and Geothermal fluids have similar properties in terms of well testing. In this regard, almost every test or approach used in Petroleum industry can be applied to geothermal well testing. Among these tests, DST (drill stem test) is the most commonly known one in terms of its applicability and reliability. Other well-known tests for geothermal well testing include static and dynamic TPS (temperature, pressure and spinner) surveys and geochemical analysis of the flowing fluid play. The data which can be acquired from these tests include productivity, flowing fluid properties, flow capacity, pressure and temperature. All other necessary results and information regarding the reservoir conditions can be estimated from these basic of data.

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