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:
Aug. 12, 2025
Filed:
Nov. 19, 2024
China University of Petroleum (East China), Qingdao, CN;
Jinsheng Sun, Qingdao, CN;
Jingping Liu, Qingdao, CN;
Kaihe Lv, Qingdao, CN;
Fengbao Liu, Qingdao, CN;
Meichun Li, Qingdao, CN;
Jiafeng Jin, Qingdao, CN;
Jintang Wang, Qingdao, CN;
Yuanwei Sun, Qingdao, CN;
Taifeng Zhang, Qingdao, CN;
China University of Petroleum (East China), Qingdao, CN;
Abstract
The present disclosure relates to the technical field of well drilling, and discloses a strongly adsorbed hyper-branched filtrate reducer for water-based drilling fluid with resistance to 240° C. and saturated salinity, a preparation method therefor and use thereof. The filtrate reducer includes a first structural unit provided by an anionic hydration-enhancing monomer, a second structural unit provided by a cationic adsorption monomer, a third structural unit provided by a main chain monomer, a fourth structural unit provided by a cyclic monomer, a fifth structural unit provided by a polyether monomer, and a sixth structural unit provided by a hyper-branched structural monomer. The filtrate reducer of the present disclosure is capable of maintaining desirable rheology and filtrate reduction performance of the drilling fluid, and the long-term stability under the conditions of 240° C. and saturated salinity.