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:
Jan. 10, 2023
Filed:
Jan. 28, 2021
Applicant:
Kuraray Co., Ltd., Kurashiki, JP;
Inventors:
Ghebrehiwet Ghebremeskel, Houston, TX (US);
Keisuke Morikawa, Houston, TX (US);
Yasuhiro Tajima, Kurashiki, JP;
Assignee:
KURARAY CO., LTD., Kurashiki, JP;
Primary Examiner:
Int. Cl.
CPC ...
C09K 8/508 (2006.01); C09K 8/588 (2006.01); E21B 43/16 (2006.01);
U.S. Cl.
CPC ...
C09K 8/5083 (2013.01); C09K 8/588 (2013.01); E21B 43/16 (2013.01);
Abstract
A particulate plugging agent, such as a diverting agent and/or loss circulation material, using a particular polyvinyl alcohol with a certain amount of monovalent metallic salt, which is water-soluble and has a buffer effect even if the environment is acidic, and thus stable, which in particular finds use in various subsurface oil production operations.