The traditional casing-design of geothermal wells in Western Turkey is no longer cost-effective and shortening wells’ production lifetime. The current reservoir conditions are much different from their initial values. Significant reduction of reservoir pressure and NCG (Non-condensable Gases) content have been observed in many geothermal fields in Western Turkey due to the construction of oversized power plants, aggressive production, and lack of unitized reservoir management. Thus, there is a need to adapt the casing-design of new production wells for the recent reservoir dynamics. A case study from the Alaşehir field, Western Turkey, is presented in this study. The proposed casing-design increases the performance and production lifetime of the artesian wells. It also enables the operators to use ESPs (Electrical Submersible Pumps) and LSPs (Line Shaft Pumps) with a large diameter for delivering large flowrates. With the new casing-design, we also aim to prevent casing-collapse due to poor cementing job between 95/8” and 133/8” casings. A set of codes written in Python was used to construct the new casing-design. The effect of the proposed design on the performance of artesian wells is studied using a wellbore simulation program, an academic version of PIPESIM. ESPs are proposed for the new and traditional casing program in the field. The proposed design will give a good insight into the development of the depleted geothermal reservoirs.

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