A new type of modified nano SiO2 viscosity reducer is successfully synthesized through modifying nano SiO2 with silane coupling agent(KH550)and adding MA,SSS,AA and AMPS monomers,and characterized by means of infrared spectroscopy,thermogravimetric analysis and scanning electron microscopy.The mass ratio of monomers,reaction temperature,reaction time,mass fractions of monomers,mass fraction of initiator and synthetic environment pH for the synthesis of the new viscosity reducer are optimized.The influences of the dosages of JN-54 and the new modified nano-SiO2 viscosity reducer,experimental temperature and shear rate on the viscosity reduction effect are studied.The optimum synthesis conditions are determined as follows:m(AMPS)∶m(MA)∶m(SSS)∶m(AA)∶m(SiO2)=7.5∶3∶13.5∶4∶2 or 7∶2.5∶13∶3.5∶4,mass fraction of monomers is 30％,reaction temperature is 40℃,pH=6.5,mass fraction of initiator is 0.3％of the total monomer mass,and reaction time is 8 h.The viscosity reduction rate of the modified nano-SiO2 viscosity reducer can still reach 98.7％at 110℃ and 100 s-1,and the optimum mass fraction is 1.5％.Compared with JN-54,the modified nano-SiO2 viscosity reducer has better viscosity reduction effect,temperature resistance and shear resistance.
heavy oil developmentmodificationpolymerization reactionnano SiO2 viscosity reducertemperature and shear resistances
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