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. 30, 2025
Filed:
Jun. 26, 2025
China University of Petroleum (East China), Qingdao, CN;
Jian Li, Qingdao, CN;
Jinsheng Sun, Qingdao, CN;
Kaihe Lv, Qingdao, CN;
Yingrui Bai, Qingdao, CN;
Jingping Liu, Qingdao, CN;
Xianbin Huang, Qingdao, CN;
Jintang Wang, Qingdao, CN;
Jiafeng Jin, Qingdao, CN;
Meichun Li, Qingdao, CN;
Bo Liao, Qingdao, CN;
Junjie Zheng, Qingdao, CN;
CHINA UNIVESITY OF PETROLEUM (EAST CHINA), Qingdao, CN;
Abstract
A polycarboxylate thinner for a carbonate/bicarbonate contamination resistant water-based drilling fluid is prepared from the following raw materials in part by mass: 5 to 10 parts of acrylic acid, 1 to 5 parts of N-vinylpyrrolidone, 5 to 10 parts of sodium methallyl sulfonate, 40 to 50 parts of isopentenyl polyethylene glycol ether, 0.02 to 0.6 part of oxidizing agent, 45 to 55 parts of reducing agent, and 40 to 60 parts of water. The thinner can solve problems caused by HCOand COcontamination in a drilling fluid, such as fluid thickening, increased viscosity and shear force, and elevated fluid loss. When applied to the drilling fluid contaminated with HCOand CO, the thinner can effectively reduce viscosity, shear force, and fluid loss of the drilling fluid.