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. 25, 2022
Filed:
Jun. 24, 2020
Applicant:
Mitsubishi Chemical Corporation, Tokyo, JP;
Inventors:
Takahiro Saka, Tokyo, JP;
Masaya Nakai, Tokyo, JP;
Assignee:
MITSUBISHI CHEMICAL CORPORATION, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C09K 8/508 (2006.01); E21B 33/138 (2006.01);
U.S. Cl.
CPC ...
C09K 8/5083 (2013.01); E21B 33/138 (2013.01);
Abstract
A filling material for underground treatment of the present invention contains at least one polyvinyl alcohol-based resin of a modified polyvinyl alcohol-based resin and an unmodified polyvinyl alcohol, and a swelling ratio of the polyvinyl alcohol-based resin after immersion in water at a temperature of 80° C. for 30 minutes is 250% to 900%. The filling material for underground treatment has enhanced swelling performance, is effective in preventing phenomena such as lost circulation, and has improved workability of filling a well drilled part with the filling material.