Method of reduced sulfonate loss in micellar flooding

Details Method of reduced sulfonate loss in micellar flooding Method of reduced sulfonate loss in micellar flooding

E - Fixed Constructions

21

B

166/33

E21B 43/20 (2006.01)

Patent

CA 1172956

ABSTRACT OF THE DISCLOSURE An improved method of oil recovery for use within an underground formation having an ion exchange capacity. An aqueous micellar fluid bank containing a surfactant is injected into the formation followed by an injection of the bank with a mobility control fluid, such as a polymer-thickened aqueous solution, into the forma- tion. The mobility control fluid has a lower salt level but a greater divalent cation-to-monovalent cation ratio than the micellar fluid make-up brine, preconditioning brine or original in-place brine in a reservoir in order to reduce the hardness of the formation fluids in situ generated at the trailing edge of the micellar fluid which in turn reduces the surfactant loss from the micellar fluid.

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