Abstract
Carbon dioxide (CO2) has recently been considered as an alternative geothermal working fluid because of some favourable fluid dynamics and heat transfer properties compared to water. The concept, however, was initially proposed in the context of engineered geothermal systems (EGS). EGS has encountered considerable unfavourable conditions and socio-political issues. Consequently, use of the CO2sequestration site to recovery geothermal energy may be practical, so called CO2-plume geothermal (CPG) system. We have performed numerical simulations to study non-isothermal multiphase flow processes of CO2displacing water and behaviour of a CPG system in a low-permeability reservoir. A number of numerical simulations under various geological and pressure/temperature conditions are performed. The objective of this research is to (1) investigate the heat extraction efficiency using supercritical CO2in comparison with water, (2) evaluate favourable and unfavourable conditions for heat extraction.
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