Production and injection are non-symmetric processes by the thermal effects themselves. The pressure response of the reservoir to a certain injected volume flow is dependent on the temperature difference between the resident and the injected water, and on the injection history. The greater the temperature differences between the injected and the reservoir fluid, the more important are the temperature effects on the pressure behaviour in the injection well. The aim was to quantify the influence of progressive cooling of the aquifer on injection pressure behaviour.

At the Neustadt-Glewe site put into operation in 1994, there was made use of a reservoir with the relatively high temperature of about 100oC through a geothermal doublet. By means of reservoir simulation and practical injection tests as well as non-isothermal interpretation, the short and long term injection behaviour was investigated at this site. Prognostic simulations prior to start-up of operation injection tests with subsequent interpretation of thermal effects and the review of the injection behaviour after the first year of successful operation are described in this paper.

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