Numerical modeling of an enhanced geothermal system with high permeability in Kizildere Field, Turkey

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Firat, Burak

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Geothermal energy has the potential to be a key player in energy transformation all over the world through Enhanced Geothermal Systems (EGS). This study evaluates the energy production from the geothermal reservoir located in the Kizildere field in Turkey in conjunction with analytical and numerical approaches. Moreover, this work investigates the impact of natural fracture networks in this high-permeability field. First, the Kizildere field data were evaluated, and then the data were analyzed for energy production for 50 years by applying a few analytical models. The field was simulated for 50 years using CMG Thermal STARS with a novel code, thermal Embedded Discrete Fracture Model (EDFM). The simulations analyzed the effects of different well designs on heat generation. Sensitivity analysis was by using various natural fracture network densities. The results show that the number of natural fractures in high permeable reservoirs does not impact the amount of heat extraction because the circulation fluid mainly flows through the matrix instead of fractures in EGS with high permeability. In addition, this thesis shows that the impact of well placement primarily depends on reservoir dimensions. Additional work was done regarding the effect of high temperature in the selection of casing. Furthermore, the thesis delivers forecasts and possible recommendations for further research.


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