Process for secondary oil recovery utilizing propoxylated...

Details Process for secondary oil recovery utilizing propoxylated... Process for secondary oil recovery utilizing propoxylated...

E - Fixed Constructions

21

B

31/31, 166/33

E21B 43/22 (2006.01) C09K 8/584 (2006.01)

Patent

CA 1316684

ICR 8093 PROCESS FOR SECONDARY OIL RECOVERY UTILIZING PROPOXYLATED ETHOXYLATED SURFACTANTS IN SEAWATER Abstract A process for removing residual oil from the near wellbore area of a subterranean formation adjacent an injection well of a waterflood operation to improve water injectivity comprising injecting through said well into said area seawater containing a surfactant having the formula: RO(CH60)7(C2H4O)2 wherein: R is a mixture of alkyl groups containing from 12 to 15 carbon atoms, Y is a sulfate group, and X is a monovalent cation. After the treatment to improve water injectivity, the formation is waterflooded.

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