Oil recovery technique:

Enhanced oil recovery (EOR) is used to increasing the amount of crude oil that can be extracted from an oil field. Enhanced oil recovery is also called tertiary recovery (as opposed to primary and secondary recovery). According to the US Department of Energy, there are three primary techniques for EOR: thermal recovery, gas injection, and chemical injection. Sometimes the term quaternary recovery is used to refer to more advanced, speculative, EOR techniques in oil field.

  • Primary oil recovery
  • Secondary oil recovery

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