Study on One-Step Hydrothermal Modification of Quartz Sand Proppant and Its Properties
In order to improve the dispersion stability of quartz sand in fracturing fluid,the surface of traditional quartz sand was modified by CTAC.The results show that 0.6%CTAC reacted with quartz sand at 80℃for 120 min,the sedimentation rate of quartz sand can be reduced by 44.85%.The contact angle between quartz sand and water increases from 28.233° to 87.853°.This indicates that the hydrophobicity of quartz sand sur-face has been greatly improved,repulsive force between quartz sand and water molecule thus increased.The surface free energy decreased from 83.342 mJ/m2 to 22.379 mJ/m2.The decrease of surface free energy make the system more stable.The reason for the decrease of sedimentation rate of modified quartz sand is explained from the perspective of energy.The zeta potential of modified quartz sand is twice that of unmodified quartz.The electrostatic stress between quartz sand particles is obviously increased,so that the particles are not easy to agglomerate and the system is more stable.
hydraulic fractureproppantquartz sandhydrophilic and hydrophobicsuspensiondispersion stability
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