摘要：Water-based drilling fluids are crucial in oil and gas exploration and development due to their effectiveness in enhancing wellbore cleaning and stability. However, as exploration advances toward deep and ultradeep wells, high-temperature, high-salinity environments present significant challenges for drilling fluids. Such harsh conditions often lead to flocculation failure of the drilling fluid system, causing pipe sticking and drilling operation failure, among others. Thus, the flocculation failure mechanism of water-based drilling fluids in high-temperature, high-salinity environments should be understood and specific rheological modifiers should be developed for safe, efficient drilling. In this study, to address these technical challenges, a novel nanocomposite filtration control agent was synthesized via emulsion polymerization by incorporating hydrophobically modified titanium dioxide nanoparticles into a polymer system comprising 2-acrylamido-2-methylpropane sulfonic acid, dimethyl diallyl ammonium chloride, N-vinyl-2-pyrrolidinone, and N, N-dimethylacrylamide. This agent was named ANDT-70 (2-acrylamido-2-methylpropane sulfonic acid, N-vinyl-2-pyrrolidinone, N, N-dimethylacrylamide, dimethyl diallyl ammonium chloride, and titanium dioxide nanoparticles). The rheological control mechanism of ANDT-70 in bentonite slurry was systematically investigated using scanning electron microscopy, transmission electron microscopy, atomic force microscopy (AFM), and rheological tests. Results show that the rheological performance of the slurry system significantly improved after adding ANDT-70, maintaining a viscosity of approximately 30 mPa s at a high-temperature of 260 °C. Even in a saturated sodium salt environment, viscosity remained at approximately 20 mPa s. AFM results indicated that the polar groups on the ANDT-70 surface generated electrostatic or hydrogen bonding interactions within the system, enhancing the system＇s adhesion and promoting the uniform dispersion of particles. In turn, these changes aided in rheological control in high-temperature, high-salinity environments. In conclusion, ANDT-70 demonstrates excellent high-temperature and salt resistance and rheological control properties, providing new research directions and design concepts for the application of nanocomposite hydrophobic materials in the field of drilling fluid rheological modification under high-temperature, high-salinity conditions. ? 2025 Author(s).

ISSN号：1070-6631

卷、期、页：卷37期9

发表日期：2025-09-01

影响因子：0.000000

期刊分区（SCI为中科院分区）：二区

收录情况：SCI（科学引文索引印刷版）,EI（工程索引）,SCIE（科学引文索引网络版）

发表期刊名称：Physics of Fluids

通讯作者：张伟,李鑫琰,杨俊,沐华艳

第一作者：蒋官澄,贺垠博,董腾飞

论文类型：期刊论文

论文概要：张伟,蒋官澄,李鑫琰,杨俊,沐华艳,贺垠博,董腾飞，Mechanistic insight into a salt- and heat-resistant nanocomposite rheology modifier for enhanced performance of water-based drilling fluids，Physics of Fluids，2025，卷37期9

论文题目：Mechanistic insight into a salt- and heat-resistant nanocomposite rheology modifier for enhanced performance of water-based drilling fluids