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Microbubble CO2 Injection for Geological Sequestration in Tight Sandstone Reservoirs

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Document pages: 6 pages

Abstract: In this study, laboratory experiments on the sweep efficiency of microbubble CO2 injections with an extremely low permeable sandstone core and the analysis of the sweep efficiency from the X-ray CT images were conducted. The permeability of sandstone samples was measured to be 0.01 millidarcy. Core samples with a special filter or a grooved disc were set in a core holder and saturated with brine before CO2 injection. The pressure and temperature were controlled at 10 MPa and 40 °C, respectively, simulating the pressure and temperature in the condition of deep formations. Microbubble CO2 and normal bubble CO2 injection (conventional CO2 injection) were performed with the same permeability. It was found that microbubble CO2 penetrated the tight sandstone for 9 h (breaktime), and the slight difference in the CO2 saturation distribution along the long axis direction just before the end of the experiment was within ~5 . Analysis of the X-ray CT images revealed that microbubble injection improved sweep efficiency.

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