It is well known that with continued production from wet gas reservoirs, the reservoir pressure eventually falls below the dew point pressure leading to condensation and loss of gas productivity in the reservoir. The concept of simultaneously injecting CO2 in a gas reservoir for long term storage while at the same time accelerating production of the gas reservoir is intriguing and promising. CO2 may also interact with carbonate matrix by changing porosity and permeability of the host rock; this is true for reservoirs that are found in the Gulf Region. Core floods experiments with carbon dioxide aging were conducted in a core sample analogue to carbonate at reservoir conditions. CO2 interaction in carbonate formation was evaluated by XRF and SEM analysis; furthermore mineral trapping was also investigated by AFM. The results of the laboratory study showed that the CO2 would dissolve some of the rock at high pressure aging. Dissolved carbonate was found also to be precipitated along the core after decreasing the pressure of the system. The results of this study are directly applicable for evaluating CO2 Huff-n-Puff, a process that can potentially raise the reservoir pressure back above the original dew point. Results of this experiment help answer some critical questions related to introducing CO2 in wet gas reservoirs and its interaction with carbonate reservoirs.


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