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:
Oct. 02, 1984
Filed:
May. 27, 1982
Applicant:
Inventors:
Frank C Robertson, Woking, GB;
Douglas Wilson, Godalming, GB;
Assignee:
The British Petroleum Company p.l.c., London, GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21B / ; C08L / ;
U.S. Cl.
CPC ...
523130 ; 166294 ; 166295 ; 523131 ;
Abstract
A method for reducing formation permeability comprising mixing (a) a homopolymer or copolymer of methyl acrylate or hydroxy alkyl acrylate, where the alkyl group is C.sub.2, C.sub.3 or C.sub.4, into which polymer hydrazide groups have been introduced, and (b) an aldehyde cross-linking agent, dispersing the mixture in an aqueous medium and injecting the aqueous dispersion into a formation, the amounts of the polymer and aldehyde being such that they will form a gel in the aqueous medium. The invention includes compositions for use in the method.