CO₂ convective mixing has been extensively studied for CO₂ dissolution in saline water but very limited with the presence of oil. The objective of this work was to visually study the supercritical CO₂ (sCO₂) dissolution and convective mixing into oil at realistic reservoir temperature and pressure conditions with and without the presence of porous media.

A specially designed high-pressure 2D-cell was used to investigate the sCO₂ mixing into oil phases. Schlieren imaging method was used as the visualization method. The experiments were carried out at 100 bar and 50 °C using n-octane, n-decane, and crude oil as the main oils. Porous media with different permeability was prepared using glass beads.

Convective fingering was found to accelerate the mixing of CO₂ with n-octane and n-decane. It was not possible to visualize the CO₂ convective fingering in crude oil due to the low opacity of the oil phase. The CO₂ dissolution into oil phases was quite instantaneous and fast without the presence of porous media. The swelling of oil was measured as 55%, 50% and 11% for n-decane, n-octane and crude oil respectively without the presence of porous media. Boundary effects were affecting the CO₂ mixing due to the circular shape of the 2D-cell. Having a water layer below the oil layer tends to dampen the CO₂ transport from the oil phase to the water phase. CO₂ dissolution into oil saturated porous media was slower compared to that without the presence of porous media. The mixing of CO₂ was faster at higher permeability than at lower permeability. Visualization of CO₂ convective mixing/fingers inside oil-saturated porous media using a Hele-Shaw cell yet to be achieved experimentally.

CO ₂对流混合已被广泛研究用于 CO ₂在盐水中的溶解，但在油的存在下非常有限。这项工作的目的是在实际油藏温度和压力条件下，在多孔介质存在和不存在的情况下，直观地研究超临界 CO ₂ (sCO ₂ ) 溶解和对流混合到油中。

使用专门设计的高压 2D 池来研究 sCO ₂混合到油相中的情况。使用纹影成像方法作为可视化方法。实验在 100 bar 和 50 °C 下进行，使用正辛烷、正癸烷和原油作为主要油。使用玻璃珠制备具有不同渗透性的多孔介质。

发现对流指法可加速 CO ₂与正辛烷和正癸烷的混合。由于油相的低不透明度，无法看到原油中的 CO ₂对流指法。在不存在多孔介质的情况下，CO ₂溶解到油相中是非常瞬时和快速的。在不存在多孔介质的情况下，正癸烷、正辛烷和原油的溶胀率分别测量为 55%、50% 和 11%。由于二维单元的圆形形状，边界效应正在影响 CO ₂混合。在油层下方具有水层往往会抑制从油相到水相的 CO ₂传输。CO ₂与不存在多孔介质的情况相比，在油饱和多孔介质中的溶解速度较慢。CO ₂的混合在较高渗透率下比在较低渗透率下更快。使用尚未通过实验实现的 Hele-Shaw 单元对油饱和多孔介质内的 CO ₂对流混合/指状件的可视化。