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:
Jun. 04, 2019
Filed:
Jun. 05, 2013
Applicant:
Basf SE, Ludwigshafen, DE;
Inventors:
Andrea Assmann, Unterreit, DE;
Roland Reichenbach-Klinke, Traunstein, DE;
Jutta Karin Langlotz, Trostberg, DE;
Assignee:
BASF SE, Ludwigshafen, DE;
Primary Examiner:
Int. Cl.
CPC ...
C09K 8/08 (2006.01); E21B 7/00 (2006.01); C09K 8/528 (2006.01);
U.S. Cl.
CPC ...
C09K 8/08 (2013.01); C09K 8/528 (2013.01); E21B 7/00 (2013.01); C09K 2208/12 (2013.01);
Abstract
The use of gelatin-based copolymers containing at least one grafted side chain formed from ethylenically unsaturated compounds as an anti-accretion additive is proposed for water-based drilling fluids in the development, exploitation and completion of underground mineral oil and natural gas deposits and in deep wells. These copolymers are water-soluble and have good biodegradability.