CO₂ ENHANCED OIL RECOVERY，is a kind of carbon dioxide into reservoir in order to improve oil recovery technology.Standard conditions, carbon dioxide is a colorless, odorless, heavier-than-air gas density is 1.977 g/l.When the temperature and pressure higher than the critical point, carbon dioxide to the nature of the change: form to liquid, close to the gas viscosity, about 100 times liquid diffusion coefficient.Then carbon dioxide is a good solvent, its solubility, penetrating more than water, ethanol, ether and other organic solvents.If the carbon dioxide in contact with the fluid substance to be separated, it can be selectively contained in the polarity of the substance, the boiling point and molecular weight of the different components are sequentially extracted.The mixture was extracted at a pressure drop or rise in temperature, the supercritical fluid in which carbon dioxide gas becomes common, and the substance to be extracted or substantially complete precipitation of the carbon dioxide and the extract was quickly separated into two phases, this may extract the active ingredient from a wide variety of materials.

CO₂ ENHANCED OIL RECOVERY is increase output 15% to 30%, extend the oil well production life of 15 to 20 years.