One of the problems that the world will face in the next future is the reduction of hydrocarbon reserves and the challenge in finding new resources. In recent decades, new ways to improve production methods and enhancing the recovery factor from reservoirs have been attempted.

Considering an increase in the different techniques of improving the recovery processes and the imperativeness of efficient recovery from existing reservoirs whose capacity for producing flow rates have been diminished, brings up the need for further studies and research for developing different methods to enhance oil recovery processes.

The goal of this paper is to investigate the profitability of immiscible water alternating CO2 injection in the secondary and tertiary recovery after water-flooding and continuous CO2 injection at laboratory scale. The experiments were performed in the sand packed model using dead oil sample taken from a southern Iranian reservoir at constant injection pressure (1500 psig) and constant temperature (the reservoir temperature, 190 °F) conditions.

The results indicate that the WAG process using CO2 can be efficient, especially when it is used a secondary recovery process rather than tertiary one.

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