3858656 is referenced by 36 patents and cites 11 patents.

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 five to 25 carbon atoms, plus sulfated oxyalkylated surfactants containing arylalkyl groups.

Title
Oil recovery process usable in formations containing water having high concentrations of polyvalent ions
Application Number
05/421,176
Publication Number
3858656
Application Date
December 3, 1973
Publication Date
January 7, 1975
Inventor
Tate Jack F
Maddox Jr Jim
Flournoy Kenoth H
Agent
Ries C G
Whaley T H
Assignee
Texaco
IPC
E21b 43/22
E21B 43/16
C09K 08/584
C09K 08/58
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