The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 26, 1987
Filed:
Jul. 02, 1985
Jim Maddox, Jr, Houston, TX (US);
Texaco, Inc., White Plains, NY (US);
Abstract
A method for modifying a sulfonate surfactant flooding system so as to permit the use of fluids of increased salinity in the polymer drive. Sulfonate systems are altered by adding about 0.05% to about 1.0% by weight of a divalent metal cation to give a total concentration of about 0.1% to about 1.0% by weight of divalent metal cation to one or more surfactant slugs of the surfactant flooding system, and adding about 0.1% to about 1.5% by weight of a sulfate or sulfonate solubilizer to the polymer drive fluid. The concentration of oil soluble petroleum sulfonates may also be decreased while the concentration of water soluble petroleum sulfonates may be increased without a decrease in surfactant slug performance.