Surfactant waterflooding with graded salinity drive for oil...

Details Surfactant waterflooding with graded salinity drive for oil... Surfactant waterflooding with graded salinity drive for oil...

E - Fixed Constructions

21

B

31/13, 166/33

E21B 43/25 (2006.01) C09K 8/584 (2006.01)

Patent

CA 1168425

ABSTRACT OF THE DISCLOSURE An improved recovery process is provided for fluent petroleum in a porous formation having spaced injection means and production well recovery means which includes a concentrated brine drive and surfactant carrier system. By injecting an aqueous drive medium having gradually decreasing brine concentration, surfactant transport and petroleum recovery efficiency are improved. Advantageously, an effective aqueous surfactant composition is formulated containing a water-soluble ether-linked sulfonate surfactant, a cosurfactant alcohol, and at least one cosurfactant or sacrificial sulfonate material in a concentrated brine carrier. 1354N

383365

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