ADAPTABILITY OF CO2 INJECTION FOR HEAVY OIL RESERVOIR

In order to get convenient and practical criterion of cyclic CO2 injection for heavy oil reservoir, selecting Gaosheng and Lengjiabao reservoir as examples and using numerical simulation and reservoir engineering methods, the adaptability of cyclic CO2 injection for heavy oil reservoir has been studied and adaptable parameters have been obtained. Form the adaptable parameters, we can see there are a quite few differences between the parameters of CO2 huff-n-puff and CO2 flooding.The results shows oil viscosity and oil saturation are the most sensitive reservoir parameters, while cyclic injection amount is the most sensitive process parameter for CO2 huff-n-puff and velocity of injection is the most sensitive process parameter for CO2 flooding. The conclusion is significant for selecting proper heavy reservoir to inject CO2.