Feasibility Study Of Hot Dry Rock Geothermal Energy With CO₂as Heating Transmission Fluid

Geothermal energy has the characteristics of low carbon green, and the CO2geologicalstorage technology is expected to achieve no carbon emission when using petrochemicalenergy.As people are paying more attention to environmental issues; these two technologieshave become hot research subjects at home and abroad. In this paper, geothermal reservoirwhich is suitable for CO2storage has been primary elected and evaluated using the literatureresearch. Preliminary thought, hot dry rock, deep saline aquifers and geopressured geothermalresources are promising. Make a future analysis about hot dry rock geothermal energy，roughestimate the exploitation potential of hot dry rock geothermal energy in China. It is consideredutilizing supercritical CO2instead of the traditional water as heating transmission fluid In theexploration of hot dry rock geothermal energy, and would achieve geologic storage of CO2aswell. In this paper, based on evaluating thermo physical properties of water and CO2,andnumerical simulation, we compare the heat transfer capacity of CO2and H2O in hot dry rockreservoir. We also analyses the wellbore flow performance by geothermal fluid calculatingmodel for wellbore temperature and pressure. We find that CO2has the advantage of heatingextraction and wellbore hydrodynamics in hot dry rock geothermal energy exploration. At last,the storage mechanism and economic benefits of CO2in the hot dry rock geothermalexploitation have both been preliminary evaluated. It has proved that utilizing super CO2asheating transmission fluid and achieving storage of CO2is feasible.