Simultaneous microemulsion-aqueous phase flooding process

Details Simultaneous microemulsion-aqueous phase flooding process Simultaneous microemulsion-aqueous phase flooding process

E - Fixed Constructions

21

B

166/33

E21B 43/20 (2006.01) C09K 8/58 (2006.01) C09K 8/90 (2006.01) E21B 43/12 (2006.01)

Patent

CA 1118340

ABSTRACT A method of enhanced oil recovery is disclosed wherein an upper- phase or a middle-phase microemulsion and an immiscible aqueous phase are simultaneously injected into a subterranean formation. The viscosities of the injected phases are adjusted so that the aqueous phase/microemulsion viscosity ratio approximates the reservoir brine/oil viscosity ratio. The injection rates of the injected phases are such that similar oil, micro- emulsion and aqueous phase velocities are achieved in the reservoir. Oil is displaced to a production well and recovered.

340436

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