Definition - What does Gas Injection mean?
Gas Injection is a production method used in the reservoir secondary recovery or maintenance phase to augment the pressure in an oil field or a reservoir. In most of the cases, the fields assimilate a well planned distribution of these injection wells to maintain the reservoir pressure and fallout a dynamic sweep of the recoverable liquids. It is the most frequently used approach in an upgraded oil recovery. The process of miscible displacement maintains the reservoir pressure and also boosts oil displacement as the interfacial tension between water and oil is reduced. This helps in the total displacement efficiency.
Petropedia explains Gas Injection
Oil and gas wells initially produce at their highest production rate and with time the production decreases. Secondary production methods are used as an effort to improve the production rate from the gas and oil wells. Gas Injection method is one of the two most important methods the other being water flooding. Gas Injection method injects gases which do not occur naturally into the reservoir. These gases include nitrogen, LPG and carbon dioxide. Carbon dioxide is the most frequently used for the miscible displacement because it can reduce the oil velocity and is less expensive as compared to LPG.