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. 23, 1985
Filed:
Mar. 31, 1983
Applicant:
Inventors:
Hiroshi Morita, Chiba, JP;
Yasuyuki Kawada, Funabashi, JP;
Junichi Yamada, Chiba, JP;
Toshiyuki Ukigai, Chiba, JP;
Assignee:
Lion Corporation, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
E21B / ;
U.S. Cl.
CPC ...
166274 ; 252 / ; 252312 ;
Abstract
A micellar slug for use in the recovery of oil is described, the slug containing a hydrocarbon, an aqueous medium, a surfactant, and a cosurfactant. The surfactant contains, as an essential component, a divalent metal salt of an alpha-olefin sulfonic acid. This micellar slug has an excellent salinity tolerance and hard-water resistance. Furthermore, the micro-emulsion formed from the present micellar slug is maintained stable in a subterranean reservoir formed by alkaline earth metal carbonates and, therefore, the oil recovery efficiency can be improved.