This paper reports on the feasibility of using carbon dioxide and flue gas in huff-n-puff cyclic gas injection to enhance light oil recovery from a waterflooded reservoir.Phase behaviour measurements were carried out on recombined reservoir oil/CO 2 mixtures in a cyclic pressure mode to simulate field application of the process. Significant amounts of CO 2 dissolved in the oil causing oil swelling and viscosity reduction. During pressure depletion (puff cycle) the oil retained CO 2 preferentially to methane; thus, the beneficial swelling and viscosity effects were maintained over an extended portion of this cycle. The Peng-Robinson equation of state was successfully tuned to match the laboratory phase behaviour data in both pressure-increasing and -decreasing modes. Corefloods were performed in the huff-n-puff mode to investigate the effect of waterflood residual oil saturation and injection gas composition (CO 2 and enriched flue gas) on oil recovery. Incremental oil recovery was observed to be sensitive to waterflood residual oil saturation and to the process application scheme. Gas utilization factors of these tests varied from as high as 17.2 Mscf/STB to as low as 2.8 Mscf/STB. These results suggest that the process is feasible, but that field application factors have to be optimized for maximum economic benefit.
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