Simulation Study of the Effect of Water Alternating Gas (WAG) and Foam-Assisted Water Alternating Gas (FAWAG) With Co2 Injection In The Presence Of Asphaltene In Light Oil Reservoir

Petroleum exploration has become one of the huge contributors of world economic growth and with the advanced technology of Enhanced Oil Recovery (EOR), the maximum amount of recovery oil is planned to be extracted. CO2 injection is one of the most commonly used EOR methods. The injection of CO2 onto light oil reservoir can cause the formation of asphaltene precipitation which may lead to major reservoir problems. FAWAG injection or Foam Assisted Water Alternating Gas injection is the improvement of WAG injection which can improve sweeping efficiency and control
gas mobility and viscous stability. In this project, the main problems that need to be controlled is the formation of
asphaltene precipitation during miscible gas injection is unnoticed because of the little amount of it and this precipitation can give huge effect to the reservoir such as oil recovery reduction. The objectives of this project is to investigate the impact of WAG and FAWAG with CO² injection on asphaltene precipitation in light oil reservoir and to
determine the optimum parameter of FAWAG with CO2 injection ; the injection duration cycle, the injection pressure and the concentration of surfactant for FAWAG with CO2 injection. The optimum parameters is decided to control the asphaltene precipitation. After all the preliminary research is done, a simulation study will be conducted by using
compositional reservoir simulator known as Computer Modeling Group Ltd (CMG). As the result of the study, it is shown that FAWAG-CO2 injection is better than WAG injection in term of oil recovery and reduction of asphaltene recipitation. The optimum parameters of FAWAG and WAG injection were successfully obtained.