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:
Jul. 03, 1984
Filed:
Feb. 18, 1982
Applicant:
Inventors:
Dieter Balzer, Marl, DE;
Kurt Kosswig, Marl, DE;
Assignee:
Chemische Werke Huels, A.G., Marl, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21B / ;
U.S. Cl.
CPC ...
166274 ; 166275 ; 252 / ;
Abstract
Extensively emulsion-free oil is recovered from a subterranean reservoir of medium or high salinity by forcing an emulsion, e.g., of oil, into an injection well. Carboxymethylated ethoxylate is utilized as the emulsifier and is selected so that the phase inversion temperature of the system:oil of reservoir/formation water/tenside/optional additives lies 0.degree.-10.degree. C. above the reservoir temperature.