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:
Mar. 16, 1982
Filed:
Feb. 19, 1980
Mohan V Kudchadker, Houston, TX (US);
Lawrence E Whittington, Katy, TX (US);
Texaco Inc., White Plains, NY (US);
Abstract
Disclosed is a surfactant waterflooding oil recovery process for use in high salinity water-containing formations employing two separate surfactant-containing slugs or a single slug in which the composition is changed from the first to the last portion of the slug injected into the formation. The first portion of the surfactant fluid contains a surfactant combination which exhibits optimum low surface tension characteristics, and the second or latter portion of the surfactant slug contains a blend of surfactants which produces a high viscosity fluid. Use of hydrophilic viscosity-increasing polymer is thus avoided, eliminating the interaction between polymer and surfactant which causes a reduction in surfactant effectiveness.