Abstract
Our previous coreflood experiments—injecting pure CO2 into carbonate cores—showed that the process is a win-win technology, sequestrating CO2 while recovering a significant amount of hitherto unrecoverable natural gas that could help defray the cost of CO2 sequestration. In this paper, we report our findings on the effect of “impurities” in flue gas—N2, O2, H2O, SO2, NO2, and CO—on the displacement of natural gas during CO2 sequestration. Results show that injection of CO2 with approximately less than 1mole% impurities would result in practically the same volume of CO2 being sequestered as injecting pure CO2. This gas would have the advantage of being a cheaper separation process compared to pure CO2 as not all the impurities are removed. Although separation of CO2 out of flue gas is a costly process, it appears that this is necessary to maximize CO2 sequestration volume, reduce compression costs of N2 (approximately 80% of the stream), and improve sweep efficiency and gas recovery in the reservoir.
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