Reinjection which began at Larderello in 1974 as a means of disposing of excess steam condensate, is now envisaged as a method for improving heat recovery. The behavior of the geothermal field when subjected to production and injection is difficult to predict because of the very heterogeneous fractured reservoir. More information is needed on circulation patterns and heat sweeping processes to estimate the long-term behavior of the reservoir and to avoid detrimental effects. A series of reinjection experiments is now under way in different parts of the Larderello reservoir, aimed at improving knowledge of these points before starting a widescale injection program. This paper presents the results of about one year of injection in an area that has been exploited intensely for over 20 years. During this test the following were noted: - almost complete vaporization of the injected water; - significant production increases and no temperature decrease in the wells around the injector.

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