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<p>The effect of oil shale expansion and the addition of FeCl<sub>3</sub> on its pyrolysis behavior was studied by hydrothermal pyrolysis experiments of cylindrical oil shale at 350&#xa0;°C. The expansion of oil shale promotes the development of pores and fractures, which leads to the drastic pyrolysis of kerogen and the discharge of pyrolysis products. Besides, when the radial swelling increment of the oil shale is 33% of the free expansion, the pyrolysis reaction is basically guaranteed. When the radial expansion increment of the oil shale is greater than 33% of the free expansion amount, FeCl<sub>3</sub> can effectively improve the yield of expelled oil by promoting the fracture of polycyclic structure and C-O bond in the kerogen, accelerating the migration of bitumen and urging the water to participate in the reaction. In addition, when the radial swelling increment of oil shale increases, the content of small molecule compounds in the expelled oil is reduced. These findings demonstrated that hydraulic fracturing of oil shale reservoirs and adding FeCl<sub>3</sub> can effectively guarantee the success and economy of in-situ oil shale mining.</p>

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Catalytic hydrothermal pyrolysis behaviors of oil shale under restrained conditions

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月1日

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  • Yihan Wang,
  • Shijie Kang,
  • Lulu Jiao,
  • Yalu Han,
  • Zhao Liu,
  • Chengcai Jin

摘要

The effect of oil shale expansion and the addition of FeCl3 on its pyrolysis behavior was studied by hydrothermal pyrolysis experiments of cylindrical oil shale at 350 °C. The expansion of oil shale promotes the development of pores and fractures, which leads to the drastic pyrolysis of kerogen and the discharge of pyrolysis products. Besides, when the radial swelling increment of the oil shale is 33% of the free expansion, the pyrolysis reaction is basically guaranteed. When the radial expansion increment of the oil shale is greater than 33% of the free expansion amount, FeCl3 can effectively improve the yield of expelled oil by promoting the fracture of polycyclic structure and C-O bond in the kerogen, accelerating the migration of bitumen and urging the water to participate in the reaction. In addition, when the radial swelling increment of oil shale increases, the content of small molecule compounds in the expelled oil is reduced. These findings demonstrated that hydraulic fracturing of oil shale reservoirs and adding FeCl3 can effectively guarantee the success and economy of in-situ oil shale mining.