The Study Of CO₂ Miscible Flooding And Storage In Sandstone Reservoir

With the development of economy, carbon dioxide from fossil fuels has had a serious threat on the human living environment. CO₂-EOR and CO₂ sequestration technology is one of the most effective ways to reduce greenhouse gases in recent years.In order to study carbon dioxide flooding and sequestration effect in sandstone reservoirs, on the basis of the carbon dioxide flooding mechanism and the carbon dioxide sequestration mechanism, Selecting Suizhong 36-1 Oil field as the reservoir study, depending on the Basic geological, Logging comprehensive interpretation, establishing the high-precision three-dimensional geological model, and using it to reservoir numerical simulation research.On the paper, selecting 17 wells in objective reservoir, designs four sets of development programs, and concludes the result that numerical simulation of four programs and the comparative evaluation: In carbon dioxide flooding process, the lighter components, the higher oil recovery; compared with water flooding, when carbon dioxide flooding into the reservoir, it not only supplements the formation energy, but also reduces the viscosity of crude oil, eliminates interfacial tension, causes oil expansion.Carbon dioxide sequestration consists of three parts in depleted reservoir, stored in the pores in a free state and a bound state, dissolved in crude oil and dissolved into the water. In the calculation of carbon dioxide in underground depleted reservoir porosity stock, there is a big mistaken, the main reason is because of ignoring the volume when carbon dioxide dissolves into the oil and water. This study measures the mixture density that carbon dioxide dissolved in the water and oil in underground reservoirs, according to it to determine the swelling volume, improving the accuracy of the carbon dioxide stock, providing a theoretical basis for calculating carbon dioxide buried.