Abstract
It is of great significance to understand the dynamic mechanism of dispersed non-aqueous gas bubbles in a porous media to develop hydrocarbon reservoirs for enhanced oil recovery (EOR). In this work, series of experiments about bubbles rising motion behavior in different influence factors were conducted through video photography enhanced with image analysis. The results showed that with the increase of the bubble length and the glass beads size, the average velocity of bubbles ascended first and then tended to be stable, which was mainly controlled by the buoyancy and the drag resistance force. On the contrary, the average velocity decreased with the pore-throat ratio increasing for bubbles with 20 mm length, which resulted from the decrease of buoyancy and the increment of drag force and interface tension due to the more liquid-gas contact area in the pores and throats occupied by the bubble. The bubbles average velocity showed the same trend with the increase of inclination angles and liquid viscosities, and the maximum average velocities were 50°–60° of inclination angle and 40%–50% of mass fraction, respectively.
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