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:
Oct. 25, 2016
Filed:
Dec. 11, 2013
Applicant:
The Nippon Synthetic Chemical Industry Co., Ltd., Osaka, JP;
Inventors:
Masahiro Saito, Osaka, JP;
Midori Asai, Osaka, JP;
Assignee:
THE NIPPON SYNTHETIC CHEMICAL INDUSTRY CO., LTD., Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08F 216/06 (2006.01); C09K 8/24 (2006.01);
U.S. Cl.
CPC ...
C08F 216/06 (2013.01); C09K 8/24 (2013.01); C09K 2208/12 (2013.01);
Abstract
The present invention provides a drilling fluid additive comprising a specific cation-modified PVA-based resin and a drilling fluid containing the same. The drilling fluid additive can reduce hydration swelling of inorganic clay mineral such as bentonite, and provide a drilling fluid such as drilling mud capable of forming a thin and tough mud wall on the stratum during drilling operation.