Enhanced Oil Recovery

Enhanced oil recovery, also called tertiary recovery, is the extraction of crude oil from an oil field that cannot be extracted otherwise. Although the primary and secondary recovery techniques rely on the pressure differential between the surface and the underground well, enhanced oil recovery functions by altering the chemical composition of the oil itself in order to make it easier to extract. Eor can extract 30% to 60% or more of a reservoir's oil, compared to 20% to 40% using primary and secondary recovery.

Techniques:

• Gas injection
• Thermal injection
• Chemical injection