Impact of Impurities on the Economic Assessment of Carbon Dioxide Capture, Transport, and Storage

The study proposes a techno-economic evaluation of geological storage of CO2 coupled with enhanced oil recovery based on the composition and price of the CO2 stream. A compositional reservoir model was developed to analyze the effect of CO2 and impurities on oil recovery and storage efficiency. The results indicate that most impurities increase the minimum miscibility pressure between the injected gas and the reservoir fluid. The higher the impurity content of the CO2, the lower the sweep and displacement efficiencies, which decreased oil recovery, while the amount of stored CO2 compared to the injected carbon increased. According to an economic analysis that includes capture, transportation, and storage, the net present values (NPVs) from CO2 composition scenarios ranging from 77.4% to 99.9% are almost identical. However, a sensitivity analysis of the economic parameters indicated that NPV is sensitive to the price of oil, discount rates, and tax policy.