| 摘要 |
A method of oil recovery from subterranean formations, and especially water wet sand formation, comprising the steps of sequentially establishing a rate of oil production for the formation as a function of formation characteristics, such as perosity, permeability, depth of formation and past production from the formation. Second, injecting into the formation a bank of chilled water solution containing carbon dioxide gas and citric acid and phosphoric acid. Third, driving the bank of water solution from the injection well by any suitable means to the production well and withdrawing oil from the production well at the established rate of oil production. The method is especially adapted as a tertiary oil recovery method and effectively provides a 70% horizontal and vertical sweep of the formation.
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