Research On Mechanical Properties And Failure Mechanism Of Nano-SiO₂ Modified Resin-coated Sand Control

As one important chemical sand control method,resin-coated sand in the artificial borehole wall sand control obtains a good application effect casing deformation well.But with the deepening development of gas and oil field,in order to meet the increasing demand for sand control,more and more higher requirements should be put forward in the mechanical properties of resin-coated sand,the method of adding nano-sized SiO₂ in the resin-coated sand achieves great improvements.In the experiment,modified nano-SiO₂ resin-coated sand is created by adding nano-sized SiO₂ in the resin.the best enhancement effect was prepared by the treatment of coupling agent with ultrasonic dispersion of hydrophilic nano-SiO₂ modified resin sand body and the compressive strength increased by 33.75% compared with the one without adding,the compressive strength of the resin-coated sand is measured to get better nano-sized SiO₂ resin-coated sand method and the nano-sized SiO₂,and scanning electron microscope and infrared spectrum are used to analyze the mechanism of improving the compression strength of the resin-coated sand.The nano-particles play an important role in strengthening and toughening the resin.In this paper,the impact strength of resin cured product is measured by using impact testing machine to study the effect of nano-SiO₂ on resin toughening,the impact strength of nano-SiO₂ modified resin increased by 39.08% compared with the unmodified one,and resin impact cross section is tested by using scanning electron microscopy to analyze the toughening mechanism of nano material.Rigorous bounds method of composite material elastic constant theory is analyzed,modulus ratio between fillers and matrix is studied,as well as the impact of filler volume fraction on elastic modulus of composite material.The relative relationship between the three methods Eshelby equivalent inclusion theory,generalized self-consistent method,Mori-Tanaka,and the Hashin-Shtrikman bounds is analyzed,derivation on prediction model of Nanoparticles modified resin of elastic modulus is done on the basis of theoretical model analysis and laboratory experiment,prediction model is calculated through examples.The addition of nano-SiO₂ greatly increased the sand control strength of resin-coated sand control,and provide certain theoretical and technical support for the application of artificial borehole wall sand control in loose sandstone reservoir sand control under other complex well conditions.