A study on the thermal-hydrodynamical-coupled CO2 flow process in the Ordos CCS-geological-formation

摘要: Abstract Non-isothermal flow in wellbores and geological formations is an important process associated with geologic storage of CO2. Technically, simulation it a highly challenging task as often encounters phase transition problems for the fluids involved, which may greatly influence profiles pressure, temperature, flowrate along wellbore consequently changes injectivity relevant gas injection. In this paper we present coupled non-isothermal wellbore/reservoir model simulating behaviors, CO2Well reservoir simulator TOUGH2/ECO2N are combined to form novel model. The developed compared verified by existing wellbore-reservoir T2Well two CO2 injection examples. These examples demonstrate that method has considerable computational advantages flows when occurs. We then apply Ordos CCS demonstration project China, investigate sophisticated, thermal-hydrodynamically-coupled processes observed there owning condensed, cold was directly captured from nearby coal liquefaction plant. results obtained simulation, field observations, provide in-depth insights into behaviors both formation. For example, revealed that, wellbore, heat exchange between injected surrounding rock plays critical role temperature distribution. It also occurred transferred period time shut-in time. addition, observation showed most entered topmost layer due high transmissivity rock. temperature-change zone travelled slower than plume. plume extended 430 m away site after 31 months injection, while merely about 90 m away, much smaller suggests at 0.83 kg/(MPa·s). should be relatively (e.g., above −3 °C if rate more 9.45 kg/s) avoid formation hydrate subsurface.