A method for displacing hydrocarbons from a hydrocarbon-bearing subterranean reservoir by injecting a displacing fluid comprising a primary fluid such as carbon dioxide or rich gas, and an additive such as nitrogen, methane, flue gas, propane, butane, LPG, hydrogen sulfide, carbon monoxide, and mixtures...http://www.google.co.uk/patents/US4557330?utm_source=gb-gplus-sharePatent US4557330 - Miscible flooding with displacing fluid containing additive compositions
