Study on Synthesis of Highly Efficient Hydrophobic Nanoparticles and Their Oil Displacement Characteristics in Low Permeability Oil Fields
In order to improve the oil displacement efficiency of low-permeability oil fields,high-efficiency hydrophobic silver nanoparticles(SHAg)were synthesized through chemical reduction method,and its stability,dispersion and oil displacing performance in core displacement experiments in oil field simulated water were systematically evaluated.The results showed that the hydrophobicity of SHAg could be effectively adjusted by controlling the mass fraction of trimethylchlorosilane(TMCS).When the TMCS mass fraction was 0.5%,the contact angle of SHAg reached 112.4°,showing excellent hydrophobicity.In addition,SHAg exhibited good stability and dispersion in simulated oil field water,especially at a NaCl mass fraction of 5%,with an average particle size of only 83.6 nm.Core displacement experiment results showed that the oil displacement efficiency of the displacement fluid containing 400 mg·L-1 SHAg was as high as 59.7%,which was significantly higher than the basic oil displacement efficiency of pure water flooding.This research not only reveals the potential of hydrophobic nanoparticles in improving the oil displacement efficiency of low-permeability oil fields,but also provides important theoretical basis and technical support for actual oil field application.
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