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. 31, 1981
Filed:
Aug. 31, 1979
James H Hedges, Bartlesville, OK (US);
Gilbert R Glinsmann, Bartlesville, OK (US);
Phillips Petroleum Company, Bartlesville, OK (US);
Abstract
A first and second series of aqueous surfactant-cosurfactant-electrolyte systems are prepared at varying electrolyte concentrations using, respectively, a relatively water insoluble cosurfactant and a relatively water soluble cosurfactant. The resulting systems are mixed with oil to be displaced or its equivalent and allowed to equilibrate so as to determine the salinity at which the microemulsion phases formed on said equilibration have approximately equal volumes of oil and water, thus giving the optimal salinity concentration for each surfactant-cosurfactant combination. Similar equilibrations are made using at least one surfactant system which employs a cosurfactant of intermediate water solubility. These systems are then used under the same or similar conditions to displace oil at the optimal salinity for each system and the resulting oil recovery percentage is plotted versus the salinity. Thereafter using the relationship that increasing the more water soluble component of the cosurfactant increases the optimum salinity value and vice versa, a cosurfactant blend is prepared so as to give a system which has an optimum salinity essentially corresponding to the unique salinity.