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:
Apr. 01, 2014
Filed:
Mar. 09, 2011
Christian Bittner, Bensheim, DE;
Günter Oetter, Frankenthal, DE;
Jack Tinsley, Mannheim, DE;
Christian Spindler, Ludwigshafen, DE;
Sophie Vogel, Mannheim, DE;
Gabriela Alvarez-juergenson, Mannheim, DE;
Marcus Guzmann, Mühlhausen, DE;
Christian Bittner, Bensheim, DE;
Günter Oetter, Frankenthal, DE;
Jack Tinsley, Mannheim, DE;
Christian Spindler, Ludwigshafen, DE;
Sophie Vogel, Mannheim, DE;
Gabriela Alvarez-Juergenson, Mannheim, DE;
Marcus Guzmann, Mühlhausen, DE;
BASF SE, Ludwigshafen, DE;
Abstract
The present invention relates to processes for tertiary mineral oil production with the aid of a surfactant mixture and to the use of a surfactant mixture for tertiary mineral oil production by means of Winsor type III microemulsion flooding, by injecting a surfactant mixture through at least one aqueous injection borehole into a mineral oil deposit, and withdrawing crude oil from the deposit through at least one production borehole, wherein the surfactant mixture, for the purpose of lowering the interfacial tension between oil and water to <0.1 mN/m, comprises at least the following components: (a) one or more polycarboxylate(s) comprising at least 50 mol % of acrylic acid units and/or methacrylic acid units and/or maleic acid units and/or itaconic acid units or salts thereof, and (b) one or more anionic and/or nonionic surfactant(s).