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IOR: is any method of producing or injecting (developing) a well (reservoir) that is not on primary production or commingled (not selective) production such as (secondary recovery like water flooding and tertiary like gas injection, chemical injection or microbial injection.

EOR: its tertiary recovery techniques for increasing the amount of crude oil that can be extracted from an oil field either by using Gas injection, Chemical injection, Microbial injection or Thermal methods.

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Q: What is the difference between enhanced oil recovery and improved oil recovery?
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