XU Ruina, JI Tiancheng, LU Taojie, JIANG Peixue
Carbon capture, utilization and storage (CCUS) refers to the separation of CO2 from energy utilization systems, industrial production or the atmosphere followed by purification and transport to facilities using CO2 or to storage sites to achieve long-term separation of the CO2 from the atmosphere. The Intergovernmental Panel on Climate Change (IPCC) recently stated that CCUS systems are a "foundation" technology for carbon emission reduction and carbon neutrality. CCUS technologies are indispensable key technologies in China's "two-carbon" goal for a carbon neutral China. This paper reviews the key heat and mass transfer issues for carbon dioxide geological storage, CO2 enhanced tight oil/shale gas/deep geothermal energy recovery in recent years by major international and domestic research groups including the authors' research group. These studies have used theoretical analyses, simulation methods including molecular dynamics, lattice Boltzmann, and computational fluid dynamics, as well as experimental methods including pore-scale visualization experiments, core-scale nuclear magnetic resonance investigations, and supercritical pressure fluid convection heat transfer investigations. These studies have analyzed the multiphase, multicomponent flow and heat and mass transfer mechanisms of supercritical CO2 in micro-nano porous structures for reservoir conditions at various scales. The influences of mineral reaction, CO2 exsolution, fluid physical properties, and scale effects on the CO2 geological storage, oil displacement, gas displacement, and heat recovery have been analyzed to provide theoretical and technical support for CO2 geological storage and utilization.
