3811507 is referenced by 44 patents and cites 6 patents.

A two component surfactant system usable in the presence of from about 3,000 to about 18,000 parts per million polyvalent ions, including calcium and or magnesium, and a method of using said dual surfactant system for recovering petroleum from subterranean formations, said surfactant system comprising a water soluble salt of a linear alkyl or a linear alkylaryl sulfonate first anionic surfactant plus a water soluble salt of an alkyl polyethoxy sulfate second anionic surfactant.

Title
Surfactant oil recovery process usable in formations containing water having high concentration of polyvalent ions such as calcium and magnesium
Application Number
05/338,117
Publication Number
3811507
Application Date
March 5, 1973
Publication Date
May 21, 1974
Inventor
Shupe Russell D
Flournoy Kenoth H
Agent
Reis C G
Whaley T H
Assignee
Texaco
IPC
E21b 43/22
E21B 43/16
E21B 43/20
C09K 08/58
C09K 08/584
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