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:
Sep. 11, 2018
Filed:
Oct. 08, 2015
Applicants:
Cnpc Usa Corporation, Houston, TX (US);
Cnpc Chuanqing Drilling Engineering Company Limited, Chengdu, CN;
Inventors:
Meng Lu, Sugarland, TX (US);
Guang Chang Ma, Guanghan, CN;
Burhan Hoxha, Houston, TX (US);
Feng Feng Xiao, Chengdu, CN;
Assignees:
CNPC USA Corporation, Houston, TX (US);
CNPC Chuanqing Drilling Engineering Company Limited, Chengdu, Sichuan Province, CN;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C09K 8/12 (2006.01); C09K 8/24 (2006.01);
U.S. Cl.
CPC ...
C09K 8/12 (2013.01); C09K 8/24 (2013.01); C09K 2208/12 (2013.01);
Abstract
Crosslinked high molecular weight acrylamide and 2-acrylamido-2-methylpropane sulfonic acid copolymers in inverse emulsion form act as inhibitive and encapsulating agents for water-based drilling fluids system. The crosslinked copolymer are particularly useful for high salt, high density drilling fluids in high temperature and high pressure applications.