Enhanced Oil Recovery or EOR is a general term for the all the techniques involving increasing the amount of crude oil extraction from oil field.
Primary development extracts between 15 to 55 % or Oil from a field, using EOR, 10 to 30 % additional recovery can be achieved.
Enhanced oil recovery is also called improved oil recovery or tertiary recovery (as opposed to primary and secondary recovery).
Commonly used EOR methods are:

  • Thermal EOR
  • Miscible EOR
  • Chemical EOR
  • Waterflooding