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:
Jun. 15, 1993
Filed:
Mar. 19, 1992
Applicant:
Inventors:
Thomas P Lockhart, Milan, IT;
Paola Albonico, Milan, IT;
Assignees:
Eniricerche S.p.A., Milan, IT;
AGIP S.p.A., Milan, IT;
Primary Examiner:
Int. Cl.
CPC ...
E21B / ;
U.S. Cl.
CPC ...
252-8551 ; 523130 ; 166295 ; 525360 ;
Abstract
An aqueous gellable composition having a delayed gelling time is disclosed, which contains a water-soluble polymer crosslinkable with Cr.sup.3+ and a crosslinking/retardant system containing a Cr.sup.3+ ion and a salicylic acid ligand, wherein said ligand can be in free form, or in the form of a complex with Cr.sup.3+, or partially in free form and partially in complexed form. Such a composition is useful for modifying the permeability in petroleum reservoirs, within a wide range of temperatures, of from about 60.degree. C. to 120.degree. C., or higher temperatures.