Nano-silica/hydroxypropyl methyl cellulose nanocomposite polymer thickener for excellent 240 °C sedimentation control performance of water-based drilling fluid

Temperature-Responsive Nano-SiO2 Composite for Improving Shale Stability in Oil-Based Drilling Fluids

“…Under the conditions of reservoir temperature and salinity, organic nanomaterials will undergo physical/chemcal reactions, such as cross-linking, expansion, adsorption, and solidification after entering the pores and fractures of the reservoir, thereby plugging pores and fractures. − Nevertheless, high temperature may break polymer chains of organic plugging materials and result in loss of material properties. Organic/inorganic composite materials composed of an inorganic rigid material as the core and an organic deformable material as the shell could be plugged by synergistic actions. ,− Inorganic core materials could bridge and plug shale nanopores, while organic materials fill the pores formed by rigid bridged nanocomposite through their excellent deformation properties. The two materials may work synergistically to form a tight plugging layer on the rock surface to prevent loss of drilling fluid, thereby protecting the well wall. − Zhong et al prepared a hyperbranched polyethylenimine modified nano-SiO 2 with dual effects of chemical inhibition and physical plugging .…”