Review article
Analysis of geothermal energy exploitation on Karlovac geothermal field
Tomislav Kurevija
; grad. eng., Faculty of Mining, Geology and Petroleum Engineering, University of Zagreb, Pierottijeva 6, Zagreb, Croatia
Željana Kljaić
; grad. eng., INA - Industrija nafte d.d., SPC Oil and Gas Production Sector, Slavonija District
Domagoj Vulin
; DSc, Faculty of Mining, Geology and Petroleum Engineering, University of Zagreb, Pierottijeva 6, Zagreb, Croatia
Abstract
Geothermal reservoir Rečica was discovered with two wells: Ka-2 and Ka-3. Based on the results of investigations from abovementioned wells, the reservoir temperature of 140 Celsius degrees was determined. Ka-3 would be production well and Ka-2 injection well. Depth interval from 1 900 to 3 523 meters is designed for hot water production in Ka-3 well and depth interval from 3 200 to 4 145 meters is designed for injection of chilled water in Ka-2 well. Gradual utilization of reservoir heat energy can be planned by, applying Clausius-Rankin process. In view of total efficiency factor, energy output of geothermal source should be expressed as maximum useful work or exergy where reversible processes lead working fluid into mechanical and thermal environment conditions equilibrium. Chilled geothermal water would be returned through injection well to the same reservoir what assures heating reproducibility and pressure maintenance in the reservoir. Economic analysis estimated total investment costs needed for development of geothermal power plant, and economic indicators of profitability of geothermal project. The production of electricity from Rečica reservoir would be economically viable with cascade principle of heat energy utilization and a high annual degree of utilization.
Keywords
Geothermal power production; geothermal energy; binary Rankine cycle
Hrčak ID:
52264
URI
Publication date:
30.4.2010.
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