Synthesis of KH570 Modified Nano Silica Polyacrylamide Nanocomposites and Its Application of EOR

Chemical flooding is an important method for enhancing oil recovery, and its mechanism is adding functional chemical reagents to the water flooding fluid to enhance micro oil washing efficiency and macro impact volume. Recently, the oil displacement agents of polymer nanocomposites have attracted increasing attentions from researchers. The series of novel acrylamide (AM)/sodium p-styrenesulfonate (SSS)/KH570 modified SiO2 polymer nanocomposites (ASK/SiO2) were successfully prepared through in situ polymerization. And this work demonstrates an effective strategy for fabricating organic-inorganic hybrid materials by covalently incorporating surface modified nanoparticles into the polymer matrix during the synthesis process. The structural characterization of ASK was unequivocally verified through 1H nuclear magnetic resonance (1H-NMR) spectroscopy analysis. The morphological characteristics of KH570 modified SiO2 and ASK/SiO2 were analyzed using scanning electron microscopy (SEM). This advanced imaging technique provided detailed insights into the surface topography and dispersion patterns of the modified SiO2 particles within the polymer matrix. Thermal gravimetric analysis (TGA) revealed that ASK/2.0 wt% SiO2 exhibited superior thermal stability compared to the pure polymer. Also, the ASK/2.0 wt% SiO2 demonstrated remarkable performance under harsh conditions, maintaining exceptional temperature resistance, salt tolerance, and shear stability. Furthermore, its optimized viscoelastic characteristics suggested improved fluid mobility control capabilities. The oil recovery of ASK/2.0 wt% SiO2 is 9.6% higher than that of the water flooding processes during the enhanced oil recovery experiment in laboratory. All results indicated that the ASK/2.0 wt% SiO2 polymer nanocomposite had tremendous potential application for enhancing oil recovery.