یوسف کاظم زاده

The selection of miscible or immiscible injection methods depends on the desired thermodynamic and operating conditions. However, gas injection alone does not increase reservoir replacement for various reasons. The reason for this is the greater mobility of gas than oil and gravitational separation. These reasons cause the injected gas to not have a favorable effect on the reduction of residual oil and causes early breakthroughs. To solve this problem, the researchers changed the method of gas injection, in which different methods such as continuous water and gas injection, foam gas injection and water and gas combination injection were proposed. The use of a combination of carbon dioxide and produced water is due to the higher solubility of this gas in water than other gases in nature and, the lower miscibility pressure. Also, the availability of this gas and the effective environmental effect of using this gas, has caused the research conducted to dissolve gas in water on the issue of combining carbon dioxide with added water. In this article, we will review the research on carbonated water injection as an enhanced oil recovery; provide challenges, solutions, and determining suitable conditions for injection. Also the number of studies conducted in recent years and important topics are mentioned.