Abstract
AbstractThis work demonstrates that diffusion may be a viable oil recovery mechanism in fractured reservoirs during injection of CO2 for EOR. The oil production rate from diffusion alone, however, depends heavily on the distribution of CO2 within the fracture network and fracture spacing. High oil recovery was observed during miscible, supercritical CO2 injection (RF=95% OOIP after 5 days) in the laboratory using an artificially fractured chalk core plug. The development in 3D fluid saturations from CT-imaging made it possible to study the oil displacement in the vicinity of the fracture, and to calculate an effective diffusion coefficient using analytical methods. A numerical sensitivity analysis, using a validated numerical model that reproduced the experiments, showed that the rate of oil production during CO2 injection declined exponentially with increasing diffusion lengths from the CO2-filled fracture and oil-filled matrix.
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