Abstract: A copolymer is synthesized from acrylamide (AM), 2-acrylamide-2-methylpropanesulfonic acid (AMPS), non-ionic group salt-resistant monomer (KYD), and n-octadecyl allyldialkyl ammonium chloride (DMAAC-18) via aqueous solution polymerization process, and used as a fluid loss additive for water-based drilling fluid. The experimental conditions of polymerization reaction are optimized through single factor method, and the structure of the copolymer is analyzed by Fourier transform infrared spectrometer. The fluid loss performance of the copolymer is evaluated. The fluid loss amount of API is 9.6 mL when the mass fraction of copolymer added in the fresh water base slurry is 1.2%. The fluid loss amount of API is 9.5 mL in a 35% NaCl base slurry. The fluid loss amount of API is 13.5 mL when the copolymer has been aged at 180℃ for 16 h. Through analyzing the particle size distribution of bentonite in the base slurry and the micro-morphology of filter cake, it is confirmed that the copolymer reduces the fluid loss amount of API by improving the compactness of filter cake.
李东, 王翟, 赵英杰, 陈亮, 全红平, 吴洋. 高温高盐钻井液用降滤失剂的合成与性能评价[J]. 现代化工, 2021, 41(8): 187-192.
LI Dong, WANG Di, ZHAO Ying-jie, CHEN Liang, QUAN Hong-ping, WU Yang. Synthesis and performance evaluation of fluid loss additive for drilling fluid at high temperature and salinity. Modern Chemical Industry, 2021, 41(8): 187-192.