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首页> 外文期刊>Physics of fluids >Pore-scale investigation of CO_2/oil exsolution in CO_2 huff-n-puff for enhanced oil recovery
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Pore-scale investigation of CO_2/oil exsolution in CO_2 huff-n-puff for enhanced oil recovery

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A pore-scale high-pressure visualization experimental system is used to investigate CO_2 exsolution during the CO_2 huff-n-puff process for enhanced oil recovery and geological CO_2 storage. Eighteen different experimental cases are examined to investigate the mechanisms by which depressurization-induced CO_2 exsolution is affected by a near-miscible vs an immiscible CO_2/oil initial state, by the depressurization rate, and by the presence of a water phase under different wettability conditions. CO_2 exsolution is divided into three processes: nucleation, growth and coalescence, and migration. Visual observations and statistical results indicate that a near-miscible CO_2/oil initial state causes intense and instantaneous CO_2 nucleation. The presence of water effectively hinders the coalescence and migration of CO_2 ganglia, reducing the generation and rapid departure of large CO_2 ganglia in both water-wet and oil-wet cases. The amount of residual CO_2 ganglia increases significantly in the presence of water, and the volumes of most of the increased residual CO_2 ganglia are small. Hindrance by the presence of water is predominantly due to contact angle hysteresis rather than the Jamin effect, since it is found that the triple-phase contact lines do not move under most conditions. The residual CO_2 saturation increases substantially in the presence of water, regardless of the wettability (oil vs water), with the improvement reaching 95.

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