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:
Dec. 15, 2020
Filed:
Nov. 06, 2019
Applicant:
Southwest Petroleum University, Sichuan, CN;
Inventors:
Yang Bai, Sichuan, CN;
Pingya Luo, Sichuan, CN;
Yan Cheng, Sichuan, CN;
Jinsheng Sun, Shandong, CN;
Guancheng Jiang, Beijing, CN;
Assignee:
Southwest Petroleum University, Sichuan, CN;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C09K 8/03 (2006.01); C09K 8/12 (2006.01); C08K 3/30 (2006.01); C08L 33/26 (2006.01);
U.S. Cl.
CPC ...
C09K 8/03 (2013.01); C09K 8/12 (2013.01); C08K 3/30 (2013.01); C08K 2003/3045 (2013.01); C08L 33/26 (2013.01);
Abstract
The invention relates to the field of drilling fluid, and provides a multi-functional weighting agent for drilling fluid and preparation method thereof, and water-based drilling fluid and use thereof, wherein the multi-functional weighting agent is an polyacrylamide/modified barium sulfate composite multi-functional weighting agent prepared by sequentially dropwise adding acrylamide and ammonium persulfate to a mixture of modified barium sulfate and deionized water in a presence of an initiator.