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:
Aug. 08, 1978
Filed:
Mar. 29, 1977
Applicant:
Inventors:
Stamoulis Stournas, Flemington, NJ (US);
Joseph J Dickert, Jr, Lower Makefield Township, Bucks County, PA (US);
Assignee:
Mobil Oil Corporation, New York, NY (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
E21B / ;
U.S. Cl.
CPC ...
252 / ; 166273 ; 166274 ; 260509 ; 2605 / ;
Abstract
A method of recovering oil from a subterranean oil reservoir by waterflooding in which at least a portion of the injected water contains an anionic surfactant comprising a hydrocarbyl hydroxyalkane aminoalkane sulfonate. The hydroxy group is in the 4- or 5-position with respect to the sulfonate group. This surfactant is stable in the presence of high concentrations of divalent metal ions. Thus, this process is applicable in those situations in which the reservoir waters and/or the waters employed in formulating the flooding medium exhibit high divalent metal ion concentrations.