Mechanism of the influence of cationic moieties on the performance of fluid loss additives for well cementing via fluorescence labeling

+ 735) facilitated precise quantification. Notably, this fluorescence labeling technique exhibited superior anti-interference capabilities compared to traditional Total Organic Carbon (TOC) analysis, enabling accurate measurement even amidst high retarder concentrations. Performance evaluations indicate that cationic incorporation enhances slurry rheology and fluid loss performance with minimal impact on compressive strength, though dispersion efficiency is marginally inferior to anionic alternatives. Further comprehensive analysis combining fluorescence, zeta potential, and particle size data reveals that while cationic groups promote dispersion, they undergo significant molecular entanglement with anionic retarders. These findings validate fluorescence labeling as a robust tool for studying additive mechanisms in complex systems and suggest that competitive interactions between cationic polymers and anionic retarders necessitate precise dosage optimization to ensure slurry stability.