Phase Behaviour Study of Flue Gas Injection into an Oil Reservoir

In this work, injection of CO2 as the main constituent of flue gas into an oil reservoir is studied. The Peng Robinson (PR) equation of states (EOS) was used to investigate phase behavior of flue gas/crude oil system. After tuning the (EOS), effect of impurities on the minimum miscibility pressure (MMP), saturation pressure, and swelling factor of reservoir oil was investigated. Results show that the PREOS can predict the saturation pressure with good accuracy. Also, such components as N2, CO, and NO increase saturation pressure and reduce oil swelling factor, while the sulfur oxides and NO2 have a reverse effect. The maximum allowable amount of each component in the injecting flue gas into reservoir is determined.