A new technique has been developed for determination of the formation permeability, hydraulic diffusivity, and the porosity-total compressibility product from interference well tests in geothermal reservoirs. At present curve-matching technique (where only values of several pressure drops are used for matching) is utilized to process field data. A new method of field data processing, where all measured pressure drops are utilized, is proposed. It is also shown that when high precision (resolution) pressure gauges are employed the pressure time derivative equation can be used for determination of formation hydraulic diffusivity. One example of designing an interference test is presented. A field example is presented to demonstrate the data processing procedure.

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