Possibilities for CCUS in medium temperature geothermal reservoir
2020
Vulin, Domagoj | Muhasilović, Lejla | Arnaut, Maja
Based on the hypothetical structure, a 3D numerical simulation model was created to examine the flow characteristics of a geothermal field. According to the known dimensions, assumption of existing fault and petrophysical properties, the model can relate to the properties of Velika Ciglena geothermal reservoir, and thus the simulation results of heat flow (reservoir cooling due to reinjection of cooled water), wellbore injectivity and productivity are comparable with previously published data related to the same field. This simulation model for a geothermal reservoir of such structure has been made for the first time and was complemented by an analysis of possible CO₂ injection. It has been established that the effect of CO₂ storage is significant until CO₂ reaches the production well (first two years). The effect of pressure relief on the CO₂ injection well has been achieved because of simultaneous injection and production and due to an increase in CO₂ saturation which had consequently induced an increase of the effective permeability for CO₂. The effect of reservoir cooling is shown, which is significant only when the water is injected, while in the case of injection and production of CO₂, this effect does not reflect on the temperature of the produced fluid.
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