Improved enhanced oil recovery

Details Improved enhanced oil recovery Improved enhanced oil recovery

E - Fixed Constructions

21

B

E21B 43/16 (2006.01)

Patent

CA 2384612

A method for enhancing the recovery of oil from underground formations is disclosed. A gas mixture which contains greater than 50% by volume carbon dioxide, the remainder being an inert gas, is injected in the underground formation to lower the oil viscosity and surface tension and increase the oil swelling. Preferably, the gas mixture contains greater than 60% by volume carbon dioxide with a gas mixture containing greater than 70% by volume carbon dioxide preferred.

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