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:
Jul. 13, 2021
Filed:
Nov. 20, 2018
Cnpc Engineering Technology R&d Company Limited, Beijing, CN;
China University of Petroleum (East China), Qingdao, CN;
Yuping Yang, Beijing, CN;
Jingping Liu, Qingdao, CN;
Ying Wang, Beijing, CN;
Long Li, Beijing, CN;
Yan Zhang, Beijing, CN;
Yushuang Liu, Beijing, CN;
Pingliang Fang, Beijing, CN;
Weiwei Hao, Beijing, CN;
Wei Zhang, Beijing, CN;
CNPC ENGINEERING TECHNOLOGY R&D COMPANY LIMITED, Beijing, CN;
CHINA UNIVERSITY OF PETROLEUM (EAST CHINA), Qingdao, CN;
Abstract
A filtrate reducer for temperature-resistant calcium-resistant water-based drilling fluid used in oil and gas reservoir protection, a drilling fluid, and uses of the filtrate reducer and the drilling fluid are described. The filtrate reducer contains structural units represented by formulas (1), (2), and (3) herein. The water-based drilling fluid contains the filtrate reducer, and exhibits good inhibitive, rheological, filtrate reducing, and reservoir protection performance when it is applied in the drilling process in a high-temperature high-calcium deep salt-gypsum formation.