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:
Nov. 24, 1998
Filed:
Dec. 27, 1996
Francisca Ferreira Rosario, Rio De Janeiro, BR;
Carlos Nagib Khalil, Rio De Janeiro, BR;
Maria Carmen Bezerra, Rio De Janeiro, BR;
Sandra Botelho Rondinini, Rio De Janeiro, BR;
Petroleo Brasilerio S.A.- Petrobras, Rio De Janeiro, BR;
Abstract
A process for fixing of a scale inhibitor in a subterranean formation, which comprises: a) injecting into the formation a solution comprising a polymeric scale inhibitor, a metal cation, a precursor and a weak organic acid, wherein the polymeric scale inhibitor and metal cation are slightly soluble in water in the formation and wherein the precursor reacts in the formation to produce an alkaline compound which causes the polymeric scale inhibitor to precipitate in the formation; and b) allowing the polymeric scale inhibitor to precipitate in the formation in an amount which is effective in inhibiting scale formation for a given period of time.