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:
Nov. 10, 1981
Filed:
Dec. 03, 1979
Timothy N Tyler, Houston, TX (US);
Jack H Park, Houston, TX (US);
Texaco Inc., White Plains, NY (US);
Abstract
Disclosed is an improved surfactant waterflooding enhanced oil recovery process employing a fluid containing as substantial in the only anionic surfactant, an ethoxylated and sulfated or ethoxylated and sulfonated surfactant. The degree of ethoxylation of the surfactant is determined by determining the degree of ethoxylation which produces the first inflection point in the electrical conductivity of a fluid as the degree of ethoxylation is increased from a value below that which causes solubility of the fluid in the aqueous environment in which it is tested to a value slightly greater than borderline solubility. Optimum results are obtained if the average degree of ethoxylation of the ethoxylated and sulfated or ethoxylated and sulfonated surfactant is from n-0.2 to n+0.1 and preferably from n-0.15 to n+0.05, where n is the degree of ethoxylation corresponding to the first inflection point in electrical conductivity.