US 12,264,279 B1
High-temperature and high-salt resistant hyperbranched lubricant for water-based drilling fluid, and preparation and application thereof
Jian Li, Dongying (CN); Jinsheng Sun, Dongying (CN); Kaihe Lv, Dongying (CN); Jingping Liu, Dongying (CN); Meichun Li, Dongying (CN); Yingrui Bai, Dongying (CN); Xianbin Huang, Dongying (CN); Jintang Wang, Dongying (CN); Jiafeng Jin, Dongying (CN); and Bo Liao, Dongying (CN)
Assigned to CHINA UNIVERSITY OF PETROLEUM (EAST CHINA), Dongying (CN)
Filed by CHINA UNIVERSITY OF PETROLEUM (EAST CHINA), Dongying (CN)
Filed on Oct. 14, 2024, as Appl. No. 18/914,368.
Claims priority of application No. 202410536000.7 (CN), filed on Apr. 30, 2024.
Int. Cl. C09K 8/12 (2006.01); C08F 283/12 (2006.01); C10M 107/50 (2006.01); C10M 173/02 (2006.01); C10N 20/00 (2006.01)
CPC C09K 8/12 (2013.01) [C08F 283/122 (2013.01); C10M 107/50 (2013.01); C10M 173/02 (2013.01); C09K 2208/34 (2013.01); C10M 2201/02 (2013.01); C10M 2229/0535 (2013.01); C10N 2020/071 (2020.05)] 9 Claims
 
1. A preparation method of a high-temperature and high-salt resistant hyperbranched lubricant for a water-based drilling fluid, comprising the steps of:
(1) synthesis of highly reactive hyperbranched polysiloxane
mixing tetraethyl orthosilicate (TEOS), diethanolamine (DEA), and triethanolamine (TEA), and stirring uniformly for a transesterification and polycondensation reaction; and after the reaction is completed, performing dialysis and freeze-drying to obtain highly reactive hyperbranched polysiloxane, wherein a mass ratio of TEOS, DEA, and TEA is 1-5:3:2; the transesterification and polycondensation reaction is performed at a temperature of 60-100° C. for 3-7 h; and
(2) preparation of high-temperature and high-salt resistant hyperbranched lubricant
adding an acrylamide (AM) monomer, an anionic monomer, and a polar ester monomer into deionized water to obtain a monomer solution; adjusting the pH of the monomer solution to 5-9, and then adding highly reactive hyperbranched polysiloxane prepared in step (1) to obtain a mixed reaction solution; introducing nitrogen to remove oxygen, raising the temperature to a reaction temperature, adding an initiator, and thermally initiating a polymerization reaction; and after the reaction is completed, vacuum-drying and crushing an obtained product to obtain the high-temperature and high-salt resistant hyperbranched lubricant for a water-based drilling fluid,
wherein the AM monomer is one of or a combination of two or more of AM, methacrylamide (MAM), and N,N-dimethylacrylamide (DMAA); the anionic monomer is one of or a combination of two or more of 2-acrylamido-2-methylpropane sulfonic acid (AMPS), sodium styrene sulfonate (SSS), and vinyl sulfonate (VS); the polar ester monomer is one of or a combination of hydroxyethyl acrylate (HEA) and butyl acrylate (BA); a mass ratio of the AM monomer, the anionic monomer, and the polar ester monomer is 1-7:1-2:1-2;
a ratio of the mass of highly reactive hyperbranched polysiloxane to the total mass of the AM monomer, the anionic monomer, and the polar ester monomer is 0.05-0.15:1;
the initiator is cerium ammonium nitrate (CAN);
the polymerization reaction is performed at a temperature of 30-80° C. for 2-6 h.