The main objective of this project was to estimate the potential of additional oil recovery from a mature oil field, with lack of pressure support and low recovery of oil, by utilizing CO₂ as injection gas for enhanced oil recovery (EOR).

According to the literature review of the undertaken CO₂ flood experience around the world, the physical properties of CO₂, the screening criteria of CO₂ enhanced oil recovery (EOR) injection, and the laboratory studies show that CO₂ is suitable to be used as a solvent in this major oil field.

This project consisted of using two models to evaluate the effects of CO₂ injection compositional model results. The first one is a small mechanistic model using Eclipse E100 for black oil simulation runs (water injection cases) and E300 for compositional runs (CO₂ injection cases). Then a full field model was developed in order to evaluate the potential of CO₂ as an EOR process compared to optimized case waterflooding using Eclipse.

Converted wells from producers to injectors and newly drilled wells contributed to pressure support thus additional recovery of oil. Water-alternating-gas (WAG) injection added incremental recovery to the waterflooding cases. Therefore, CO₂ is considered applicable for this reservoir and recommended to conduct an economic study for this area.