Waterflooding employing amphoteric surfactants

Details Waterflooding employing amphoteric surfactants Waterflooding employing amphoteric surfactants

C - Chemistry, Metallurgy

09

K

31/13

C09K 8/584 (2006.01) B01F 17/00 (2006.01)

Patent

CA 1085599

WATERFLOODING EMPLOYING AMPHOTERIC SURFACTANTS Abstract of the Disclosure Process for the recovery of oil from a subterranean oil reservoir involving the injection into the reservoir of an aqueous solution of an amphoteric surfactant having an inner quaternary ammonium group linked to a terminal sulfonate or carboxylate group. The amphoteric surfactants may be employed in relatively low concentrations within the range of 0.0005 to 0.1 weight percent and injected in a slug of at least 0.5 pore volume. The invention may be applied in situations in which the reservoir waters and/or the waters employed in formulating the surfactant solution contain relatively high amounts of divalent metal ions. Specifically disclosed amphoteric surfactants include hydrocarbyl dialkyl or dihydroxyalkyl ammonium alkane sulfonates and carboxylates in which the hydrocarbyl group contains from 8 to 26 carbon atoms. -1-

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