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:
May. 23, 1978
Filed:
Jan. 10, 1977
Karlheinz Koch, Haan, DT;
Horst Rutzen, Langenfeld, DT;
Henkel Kommanditgesellschaft auf Aktien, Dusseldorf-Holthausen, DT;
Abstract
A method of extracting mineral oil from subterranean formation by flooding comprising the steps of forcing an aqueous liquid into a subterranean formation containing mineral oil and displacing the mineral oil through at least one bore hole in the subterranean formation, said aqueous liquid containing from 0.01% to 15% by weight of an amphoteric surface-active compound selected from the group consisting of (1) a betaine having the formula ##STR1## wherein R.sub.1 and R.sub.2 are members selected from the group consisting of hydrogen and alkyl having from 1 to 18 carbon atoms, with the proviso that the sum of the carbon atoms in R.sub.1 + R.sub.2 is from 9 to 18, R.sub.3 and R.sub.4 are members selected from the group consisting of lower alkyl and lower alkylol, x is an integer from 2 to 4, y is an integer from 0 to 1 and z is an integer from 1 to 4, and (2) mixtures of said betaine with up to 20% by weight of an acid having the formula ##STR2## wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4, x and z have the above-assigned values.