首页|Development of Superhydrophobic Nano-SiO2 and Its Field Application in Low-permeability,High-temperature,and High-salinity Oil Reservoirs
Development of Superhydrophobic Nano-SiO2 and Its Field Application in Low-permeability,High-temperature,and High-salinity Oil Reservoirs
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In this study,to meet the stringent requirements on the hydrophobicity of nano-SiO2 particles for use in depressurization and enhanced injection operations in high-temperature and high-salinity oil reservoirs,secondary chemical grafting modification of nano-SiO2 is performed using a silane coupling agent to prepare superhydrophobic nano-SiO2 particles.Using these superhydrophobic nano-SiO2 particles as the core agent,and liquid paraffin or diesel as the dispersion medium,a uniform dispersion of nano-SiO2 particles is achieved under high-speed stirring,and a chemically enhanced water injection system with colloidal stability that can be maintained for more than 60 d is successfully developed.Using this system,a field test of depressurization and enhanced injection is carried out on six wells in an oilfield,and the daily oil production level is increased by 11 t.The cumulative increased water injection is 58784 m3,the effective rate of the measures was 100%,and the average validity period is 661 d.
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