In geothermal applications engineers have to deal with high bottomhole temperatures. In Turkey many of the geothermal power plants are located in the Buyuk Menderes Graben in Western Anatolia. Bottomhole temperatures in this region could be as high as 275 C. High temperatures could present problems for various applications. For example, various chemicals are used to remove scaling or to prevent corrosion in a well. Some forms of chemicals will not work under high temperatures and therefore the bottom hole would need to be cooled by way of fluid injection before any chemical injection is applied. Furthermore, cement jobs for the casing can also be affected by temperatures. Hence bottomhole temperatures must be modeled accurately for appropriately treating the cement. All of the above mentioned problems require the modeling of temperature throughout the wellbore. In this study we have developed a numerical model capable of modeling the temperatures in the wellbore. The model is based on solving the energy balance equation under steady state conditions only. The model considers the heat transfer by way of convection both in the well and the reservoir and heat transfer by way of conduction to the surrounding environment. We specifically focus on the bottom hole cooling via fluid injection and consider the effects of various well parameters on the cooling time. The parameters considered in this study are the temperature of the cooling fluid, the radius of the well-used, the injection time and/or buildup and the injection rate.

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