Modeling bottomhole temperatures in geothermal wells is very important since in many cases it is almost impossible to measure directly the bottomhole temperature. Hence an accurate mathematical model becomes a necessity for modeling the temperature behavior. Geothermal reservoir temperatures in Turkey, which are mostly located in the Buyuk Menderes Graben, can reach well over 250 C. At these temperatures, some operations become impossible and a cooling Schedule by way of injecting cold water is applied. Hence the models used should be able to determine the behavior of the bottomhole temperature during the cooling and the heating after the cooling operation. During the injection process the injected fluid penetrates into the reservoir, hence during the cooling and heating that follows, this has to be taken into account. A numerical model is developed for this purpose and is compared to the analytical approaches in the literature. Particularly the study focuses on the effect of the injected cold water, that has penetrated into the reservoir, on the cooling and the heating stages. The analytical approaches in the literature usually do not consider the effect of the colder water injected into the reservoir. The numerical model considers the heat transfer by way of conduction from the well to the formations and the convective heat transfer in the well and in the reservoir. Results show that the injected water in some cases can have an important effect on the bottomhole temperature behavior.

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