Numerical simulation study on CO2 flooding in ultra-low permeability reservoirs

Massive discharge of CO2 has serious impact on the global climate and threatening the survival of humanity and life. How to make waste profitable becomes the subject of attention. Against this issue with my research domain, CO2 could be injected in the oilfield as a kind of oil-displacing agent, especially the ultra-low permeability oilfield with difficulty in water injection. This technology not only displaced oil but also sealed up part of CO2 underground forever. This passage summarized CO2 displacing mechanism, and did research on the opportunity of advanced CO2 injection and the style of cycle CO2 injection by reservoir numerical simulation application in a typical block using Eclipse software. Through comparing with six proposals, the consequences indicated that CO2 flooding technology could be applied in ultra-low permeability oilfield. Advanced CO2 injection and the style of cycle CO2 injection could both have good flooding effect and pressure maintenance degree. The best opportunity of Advanced CO2 injection is 4 months. In cycle injection proposals, increase-decrease style is better than increase-suspend style. These conclusions could not only provide new theoretical basis for gas flooding in ultra-low permeability reservoirs, but also solve the reduction of CO2.