Oil recovery process usable in formations containing water...

Details Oil recovery process usable in formations containing water... Oil recovery process usable in formations containing water...

E - Fixed Constructions

21

B

31/16, 166/31

E21B 43/16 (2006.01) C09K 8/584 (2006.01)

Patent

CA 1043550

ABSTRACT OF THE DISCLOSURE A dual surfactant system usable in the presence of from about 200 to about 18,000 parts per million polyvalent ions, such as calcium and/or magnesium, and a method of using said surfactant system for recovering petroleum from subterranean formations, said surfactant system comprising water soluble salts of alkyl or alkylaryl sulfonates wherein the alkyl chain may have from 5 to 25 carbon atoms, plus sulfated oxyalkylated surfactants containing arylalkyl groups. -I-

209668

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