More than one thousand wells have been drilled in Turkey for geothermal energy development which ranked the country up to fourth ranking in total geothermal energy production worldwide. On the contrary to the number of the wells, there is very limited resources about the costs of these wells and whether it is more affordable to invest to geothermal energy in Turkey in comparison with other geothermal producer countries. The objective of this paper is to provide a numerical method and software to calculate the drilling, well completion and well testing costs of new wells which can be used as an estimation by operators who is interested in investing in this market and as a result provide a comparison of these costs with the well costs in other thermally active countries Well drilling and completion data from more than twenty wells have been analyzed and merged together to form a software to calculate the estimated costs of drilling, completion and well testing a well with a diesel rig in Turkey. This software is using the rig capacity, rig type, the drilling type (kelly or top drive), casing setting depths for each casing, existing drilling third party services (mud, directional drilling, performance drilling etc.) and estimated rate of penetration values from offset wells as the input. Software runs with already calculated casing running times, tripping speeds and connection times for each different size of casings and drillpipes together with the time estimations formulas and provides the service costs and time graphs with the option of changing each input easily. As the result of the study, it was observed that the associated costs in Turkey are the cheapest amongst the costs of the wells in Kenya, Iceland, Nevada, Australia and the United States. The major reasons of these low costs are mainly because of the following three main parameters. Firstly, daily operating costs of rigs and third-party services and labor costs in Turkey are more affordable compared to other countries. Secondly, the major equipment of the well which is the casings are chosen from the lowest cost option since wells are not overbalanced and there is no need for a high cost or high-grade casing to drill these wells. Thirdly, the drilling experience in Turkey resulted in a competitive market which resulted in more optimized wells with the minimum drilling times. In the literature, there is no published study for the estimation of drilling, well completion and well testing costs of geothermal wells in Turkey. This study and the associated software is very important for a geothermal operator to estimate the project times and related costs associated with their investment.

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