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:
Feb. 12, 1980
Filed:
Aug. 21, 1978
Applicant:
Inventors:
Assignee:
Standard Oil Company (Indiana), Chicago, IL (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21B / ;
U.S. Cl.
CPC ...
166275 ; 1663 / ;
Abstract
A method for improving the sweep efficiency of a waterflood comprising the addition of a small amount of a surfactant, preferably a petroleum-derived sulfonate, to at least the first portion of injected water. The surfactant interacts with clays in the formation to reduce the permeability of the formation to the flood water and thereby improve the mobility ratio of the flooding process, resulting in a better sweep efficiency of the flooding medium through the reservoir.