Oil recovery by waterflooding employing multi-component...

Details Oil recovery by waterflooding employing multi-component... Oil recovery by waterflooding employing multi-component...

E - Fixed Constructions

21

B

166/31

E21B 43/22 (2006.01)

Patent

CA 1047394

OIL RECOVERY BY WATERFLOODING EMPLOYING MULTICOMPONENT SURFACTANT SYSTEMS Abstract of the Disclosure A process for the recovery of oil from subterranean oil reservoirs by waterflooding employing an anionic-nonionic surfactant system which is particularly suitable for use in reservoirs in which the connate waters contain a high salt content, including divalent metal salts, or which may be employed in carrying out waterfloods in which the available injection waters exhibit a relatively high salt content. The multifunctional surfactant system comprises a surface- active amide linked sulfonate anionic group and a surface- active polyethylene oxide nonionic group and may be employed in an aqueous solution having a salinity within the range of 3 to 25 weight percent. Subsequent to the injection of the aqueous solution of surfactant, an aqueous flooding medium may be injected which exhibits a salinity which is lower than the salinity of the surfactant slug. -1-

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