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:
Jul. 08, 2008
Filed:
Nov. 21, 2006
Luis Cesar Ferreira Barbosa, Rio de Janeiro, BR;
Sérgio Luiz Pereira DE Freitas Coelho, Niterói, BR;
Priscila Moczydlower, Rio de Janeiro, BR;
Geraldo Maria Ramos DE Godoy, Rio de Janeiro, BR;
Edson DE Souza Leite, Petröpolis, BR;
Luis Cesar Ferreira Barbosa, Rio de Janeiro, BR;
Sérgio Luiz Pereira de Freitas Coelho, Niterói, BR;
Priscila Moczydlower, Rio de Janeiro, BR;
Geraldo Maria Ramos de Godoy, Rio de Janeiro, BR;
Edson de Souza Leite, Petröpolis, BR;
Abstract
A process for the selective controlled reduction of the relative water permeability in high permeability, oil-bearing formations, with negligible reduction of the permeability to oil. The process comprises, for sandstone reservoir rocks, a first layer of cationic polymer, followed by a brine spacer slug and a second polymer layer made up of a suspension of anionic polymer and an anionic or non-ionic microgel, optionally this configuration being repeated. As a result the thickness of the polymer layer is considerably increased, which permits the process to be used in high permeability formations. For limestone rocks the first layer is made up of anionic polymer, while the second layer involves a suspension of cationic polymer/cationic or non-ionic microgel. The polymers are all injected as aqueous suspensions in brine or seawater.