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Yang, Fan; Li, Da‐Qi; Song, Yong‐Tao; Zhang, Ying; Shu, Wen‐Ming; Yu, Wei‐Chu
Journal of applied polymer science, January 10, 2024, Volume: 141, Issue: 2Journal Article
Wellbores are destabilized by the immersion of a formation in drilling fluid during deep well drilling. To address this issue, in the present study, trimethylolethane triallyl ether (TMETE), 2‐acrylamide‐2‐methylpropanesulfonic acid (AMPS), acrylamide, and N‐vinylpyrrolidone undergo free radical copolymerization to produce a PTAAN filter loss reducer. The Box–Behnken response surface method is used to optimize the synthesis of PTAAN; the optimal conditions are 1 wt% TMETE and 0.1111 wt% initiator at 60°C. Fourier transform infrared spectroscopy, transmission electron microscopy, and thermogravimetric analysis are used to characterize the composition, micromorphology, and thermal stability of the PTAAN product, respectively. The synthesized product is resistant to high temperatures and salt under the optimal synthesis conditions. It has an API filtration loss of 8.2 mL for freshwater‐based mud, an API filtration loss of 13.8 mL for 20% by weight brine mud after aging at 220°C, and an API filtration loss of 29.5 mL at 150°C under high temperatures and pressures. Incorporating PTAAN into the base slurry prevents clay particle agglomeration at elevated temperatures and high mineralization, resulting in a broader clay particle size distribution and ultimately leading to the formation of a thin and compact filter cake. A filter loss reducer of PTAAN has been synthesized from trimethylolethane triallyl ether, 2‐acrylamide‐2‐methylpropanesulfonic acid, N‐vinylpyrrolidone, and acrylamide by free radical copolymerization. The Box–Behnken response surface method was used to optimize the synthesis process. The PTAAN has excellent tolerance in 20% NaCl aqueous solution and 1% CaCl2 aqueous solution after aging at 220°C.
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