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:
Sep. 24, 1985
Filed:
Jul. 25, 1984
Applicant:
Inventor:
Dieter Balzer, Marl, DE;
Assignee:
Chemische Werke Huels A.G., Marl, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21B / ;
U.S. Cl.
CPC ...
166274 ; 166273 ; 252 / ;
Abstract
A process for extracting extensively emulsion-free oil from a subterranean deposit, the formation water of which has a medium or high total salinity and has a relatively low alkaline earth metal ion concentration, comprising injecting into an injection well therein a 1-20% strength aqueous tenside solution or dispersion in formation water of a mixture of 10-90% of carboxymethylated ethoxylates of the formula