Efficient preparation of amphiphilic particles and analysis of their application prospects in oil recovery
In view of the poor ability of nanoparticles to reduce the oil-water interface and emulsify in the displacement process,Janus nano-SiO2 with amphiphilic structure was successfully prepared by asymmet-ric modification of nano-SiO2 through pickering lotion interface protection method.Through verification,the lipophilic modifier hexadecyl trimethoxysilane was successfully introduced,and almost all of the nano-SiO2 was successfully protected by paraffin during the preparation process,and amphiphilic Janus nano-SiO2 was successfully prepared.By this method,Janus nano-SiO2 can be efficiently and simply prepared in large quantities,providing a basis for large-scale application needs in the oil field.Janus nano-SiO2 has stronger emulsifying ability and stability compared to hydrophilic and lipophilic nano-SiO2,so its oil carrying capacity is stronger.In the case of high water cut in the reservoir,the lotion droplets formed by Janus nano-SiO2 float on the water phase and can be brought out with the movement of water to improve the oil recovery of the reservoir;Janus nano-SiO2 can form a stable lotion layer at a lower concentration,which is conducive to cost saving and has application prospects in the oil field.
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