Abstract: The experimental research is made on application of CO₂ stimulation process to Samaa heavy oil reservoir with high porosity and high permeability in Block 3/7 in Palogue oilfield of The Republic of Sudan, which includes the effects of CO₂ injection rate, soak time and flowing bottom hole pressure on this process. The study shows that soak time has a restricted effect, but flowing bottom hole pressure has a big effect on it; there exist optimum CO₂ injection rate; multiple pressure drawdown and anterior three cycles of CO₂ stimulation will get a good response. It is concluded that proper CO₂ injection rate, reasonably controlled flowing bottom hole pressure and making multiple pressure drawdown will obtain better responses in a few cycles of CO₂ stimulations. These results could be as a guide for field application and design of CO₂ stimulation process in Samaa heavy oil reservoir.

Key words: CO₂ stimulation, recovery percent, oil draining rate