Poly (sodium p-styrene sulfonate) modified Fe3O4 nanoparticles as effective additives in water-based drilling fluids

Poly (sodium p-styrene sulfonate) modified Fe3O4 nanoparticles were introduced into water-based drilling fluids and the fluid loss were improved obviously due to the nano-pore of in the filter cake were effectively plugged by the polymer surface modifed nanoparticles.209