(1. College of Petroleum and Natural Gas Engineering, Liaoning Shihua University, Fushun 113001, China) (2. International Education College, Liaoning Shihua University, Fushun 113001, China) (3. School of Chemical Engineering and Environment, China University of Petroleum, Beijing 102249, China)
In the oil production process, higher requirements have been put forward by the oilfields for the performance of oil-displacing materials in recent years. The application of nano-materials is an important method to improve the performance of oil-displacing agents from a microscopic point of view. Current research shows that the modification of nanomaterials, such as surface graft modification, core-shell molecular structure construction, and the combination of nanomaterials with other oil displacement materials such as polymers and surfactants can improve the crude oil recovery. Nanomaterials can promote crude oil flow by reducing oil-water interface tension, emulsifying crude oil to reduce the viscosity of crude oil, improving rock surface wettability, and stabilizing foam. It can be seen that nanomaterials are of great significance in the enhancement of oil recovery. The research progresses of nano-SiO2, nano-TiO2, nano-cellulose, polymer nano-spheres and nano-graphene at home and abroad in recent years are all reviewed. The bottlenecks in the research and development are analyzed and the future research and development directions are proposed. The properties of nanomaterials, such as improving oil recovery performance, temperature resistance, salt resistance, etc., are reviewed in order to provide reference for related research.