Definition - What does Injection Gas mean?
Injection Gas is a secondary recovery method that involves the use of gas to supplement the pressure in an oilfield or reservoir. It is one of the most common approaches in enhanced oil recovery. It maintains the overall pressure in the reservoir and also retains oil displacement thus the interfacial tension between the water and the oil is minimized to a great extent. Generally, gases like carbon dioxide, nitrogen, and natural gas are used in the process.
Petropedia explains Injection Gas
Injection Gas is achieved by injecting gas into a well to maintain the pressure in the reservoir. Due to the presence of carbon dioxide, it reduces the oil viscosity and is less expensive than petroleum gas. It relies on the phase behavior of mixtures of gas, reservoir temperature, pressure and crude oil composition. It serves as an economical way to dispose of uneconomical gas production on oil reservoirs. Moreover, it is an efficient alternative for improving recovery rates in the oil reservoirs. In most cases, an oilfield has planned distribution of gas injected wells thus effect an efficient sweep of recoverable fluids.