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. 22, 1986
Filed:
Feb. 29, 1984
Applicant:
Inventors:
Raimund Haas, Frankfurt am Main, DE;
Dieter Ohlendorf, Liederbach, DE;
Werner Interthal, Russelsheim, DE;
Assignee:
Hoechst Aktiengesellschaft, , DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C09K / ; E21B / ;
U.S. Cl.
CPC ...
252 / ; 166275 ;
Abstract
Method of controlling the mobility of aqueous flows through fissures, slits or pores, in particular of flooding waters in tertiary production of crude oil, wherein cationic surfactants which, on measurement of the electric birefringence with a pulsed rectangular electrical field in pure aqueous solutions, give a measurement signal, from the decrease of which a relaxation time of 0.01 .mu.s to 10 ms, in particular of 0.1 .mu.s to 2 ms, results, are added to the aqueous medium. Preferred suitable cationic compounds are those of the general formula