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<p>In this work, the hydrophobic and oleophilic epoxy semi-coated quartz sand proppant decorated with stearic acid functionalized TiO<sub>2</sub> nanoparticles is successfully prepared. The unique semi-coated structure is characterized by SEM, SDF, and TEM. Compared with raw quartz sand proppant, the water contact angle of the epoxy semi-coated quartz sand proppant can even reach 141.6°, which is due to the rough surface and hydrophobic coating induced by semi-coated epoxy and hydrophobic stearic acid-modified TiO<sub>2</sub>. Meanwhile, the water contact angle could be adjusted by controlling the weight content of quartz sand. Moreover, the semi-coated proppant can maintain its hydrophobicity after treated by boiling water for 4&#xa0;h, indicating improved thermal stability. The physical properties including bulk density (1.44&#xa0;g/cm<sup>3</sup>), apparent density (1.40&#xa0;g/cm<sup>3</sup>), acid solubility (3.43%), and breakage rate (1.26%) of the semi-coated proppant decorated with stearic acid functionalized TiO<sub>2</sub> nanoparticles are improved. The thermal stability, acid solubility, and flow conductivity are analyzed as well. This work could provide a new idea for the preparation of quartz sand proppant to enhance the petroleum and gas production through hydraulic fracturing technology.</p>

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Preparation and properties of epoxy semi-coated quartz sand proppant decorated with stearic acid functionalized TiO2 nanoparticles

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年3月1日

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  • Jiang Guo,
  • Jiajing Xie,
  • Baoqiang Lv,
  • Longqiao Hu,
  • Yukun Sun,
  • Yu Duan,
  • Wenling Wu,
  • Fujian Zhou,
  • Jianfeng Zhu

摘要

In this work, the hydrophobic and oleophilic epoxy semi-coated quartz sand proppant decorated with stearic acid functionalized TiO2 nanoparticles is successfully prepared. The unique semi-coated structure is characterized by SEM, SDF, and TEM. Compared with raw quartz sand proppant, the water contact angle of the epoxy semi-coated quartz sand proppant can even reach 141.6°, which is due to the rough surface and hydrophobic coating induced by semi-coated epoxy and hydrophobic stearic acid-modified TiO2. Meanwhile, the water contact angle could be adjusted by controlling the weight content of quartz sand. Moreover, the semi-coated proppant can maintain its hydrophobicity after treated by boiling water for 4 h, indicating improved thermal stability. The physical properties including bulk density (1.44 g/cm3), apparent density (1.40 g/cm3), acid solubility (3.43%), and breakage rate (1.26%) of the semi-coated proppant decorated with stearic acid functionalized TiO2 nanoparticles are improved. The thermal stability, acid solubility, and flow conductivity are analyzed as well. This work could provide a new idea for the preparation of quartz sand proppant to enhance the petroleum and gas production through hydraulic fracturing technology.