CO2 diffusion plays an important role in many
CO2 injection techniques. But CO2 diffusion
in multiliquid-phase
systems has not been thoroughly investigated. Here multiliquid-phase
system refers to the liquid system coexisting water, light oil, and
heavy oil phases. This study investigates the CO2 concentration
and the induced oil expansions when CO2 diffuses in a multiliquid-phase
system. First, the mathematical model is developed based on the location
of the CO2 diffusion front in the multiliquid-phase system.
Second, the corresponding numerical model is established for different
diffusion stages. To accurately describe the swelling of two oils,
we employ the moving mesh technology to monitor the movement of two
interfaces. Finally, CO2 concentration profiles, the induced
oil swelling, and the movement of the CO2 front are studied
by coding the developed numerical model. The results demonstrate that
the CO2 concentration distribution and the induced oil
swelling exhibit different performances in various phases at different
diffusion stages. So it is necessary to divide the diffusion stage
when studying the CO2 diffusion in a multiliquid-system.
CO2 diffusion results in 19.52% and 17.21% expansion for
light and heavy oil, respectively.
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