Ion exchange controlled chemically aided waterflood oil...

Details Ion exchange controlled chemically aided waterflood oil... Ion exchange controlled chemically aided waterflood oil...

E - Fixed Constructions

21

B

166/31

E21B 43/20 (2006.01) C09K 8/58 (2006.01) C09K 8/90 (2006.01) E21B 43/16 (2006.01) E21B 43/22 (2006.01) E21B 43/28 (2006.01)

Patent

CA 1091576

ABSTRACT A process for recovering oil by successively injecting at least a chemical slug containing an active aqueous surfactant system or thickened aqueous liquid and an aqueous drive liquid into a reservoir having a significant amount of ion exchange capacity, is improved. The ionic composition of each injected fluid is arranged to provide a ratio, between the concentration of its effectively predominate monovalent cation and the square root of the concentration of its effectively predominate divalent cation, which ratio at least substantially equals such a ratio within the aqueous fluid immediately ahead of the injected fluid.

298754

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