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. 10, 2018
Filed:
Nov. 23, 2015
Applicant:
Akzo Nobel Chemicals International B.v., Amhem, NL;
Inventors:
Assignee:
AKZO NOBEL CHEMICALS INTERNATIONAL B.V., Arnhem, NL;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21B 43/16 (2006.01); C09K 8/68 (2006.01); C09K 8/60 (2006.01); C09K 8/575 (2006.01); E21B 41/02 (2006.01); E21B 37/06 (2006.01); E21B 43/267 (2006.01); E21B 43/25 (2006.01); E21B 43/04 (2006.01);
U.S. Cl.
CPC ...
C09K 8/602 (2013.01); C09K 8/5753 (2013.01); C09K 8/68 (2013.01); E21B 37/06 (2013.01); E21B 41/02 (2013.01); E21B 43/16 (2013.01); C09K 2208/26 (2013.01); C09K 2208/30 (2013.01); E21B 43/04 (2013.01); E21B 43/25 (2013.01); E21B 43/267 (2013.01);
Abstract
Compositions and methods are provided for delayed breaking of viscoelastic surfactant gels inside subterranean formations. Breaking is accomplished without mechanical intervention or use of a second fluid. The delayed breaking agent is a hydrophobically modified alkali swellable emulsion polymer, which can be a copolymer comprising acidic monomers, nonionic monomers, and associative monomers. The viscoelastic surfactant can be a zwitterionic surfactant, and can be selected from the group consisting of sultaines, betaines, and amidoamine oxides.