It is a process where oil production is attempted to increase or the ultimate recovery is maximized by injecting an agent not naturally present in the reservoir, such as various kinds of chemicals, microbes or stream etc. Broadly EOR processes can be classified as follows:
1) Thermal Processes
- Steam Injection
- In-Situ Combustion
- Polymer Injection
- Alkaline Injection
- Surfactant Injection
- Saline Water Injection
- ASP Injection
3) WAG (Water Alternating Gas Injection)
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