| dc.description.abstract | CO2-EOR(Enhanced Oil Recovery) is an effective and useful technology that can not only increase the oil production to meet the increasing need for energy around the world, but also mitigate the negtive influence of global green house effect. Different categories of oil recovery methods including primary recovery, secondary recovery, and EOR technologies are introduced at first. Then the history, global distribution, screening criteria, mechanisms, advantages and disadvantages of CO2-EOR are discussed. Some common CO2-EOR processes and technologies, such as miscible and immscible CO2-EOR processes, Water Alternating Gas(WAG) technology, and Carbonated water injection(CWI) are touched on as well. In the simulation part, OLGA-Rocx is used to simulate the process of CO2-EOR. Primarily, waterflooding through oil reservoir is simulated. Afterwards, CO2-EOR is simulated by adjusting the relative permeability curves and reducing oil viscosity. The simulation results of both waterflooding process and CO2-EOR process are compared to evaluate how much extra crude oil can be produced by using CO2-EOR. Other factors that may influence the simulating results when evaluating the performance of CO2-EOR, such as reservoir scale, simulation period, reservoir pressure, reservoir porosity, reservoir permeability, relative permeability model, and reservoir heterogeneity are studied as well. | |
