The need to improve the recovery factor for typical oilfields and accelerating associated production is the main reason behind enhanced Oil Recovery processes (EOR). In an ever changing environment of the downhole the challenge to EOR processes is the complex interaction between injected agents and existing reservoir fluids. Careful monitoring is important in relation to reservoir understanding which is essential to evaluating various EOR methods.
-Gas injection (CO2 injections)
Gas injections use gasses such as natural gas, nitrogen or carbon dioxide (CO₂) that expand the reservoir to push additional oil into the wellbore, or other gasses that dissolves the oil to lower its viscosity and improves flow rate..