The convent a constant rate of onal methods of well tests analysis usually assume discharge of the producing well. The procedure involves matching a log-log plot of test data (drawdown versus time) to analytic or semi-analytic solutions that are based on a model of the production well as a line source of constant strength in an infinite reservoir. However, variable discharge well test conditions may arise under a variety of conditions, such as existing well - field production schedules, step-drawdown tests, and influence of the pumping water level on the production rate. It is very desirable to have the capability to reliably interpret data from the tests. In fact, the present study was prompted by a set of recent geothermal well test data in which due to various mechanical problems, the flowrate during the first 70 hours of production varied widely and could not effectively be treated as a mean constant rate. The present paper reports the development of a general technique of analyzing well tests with variable flow rates.

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