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| Experimental study on permeability characteristics and anisotropy evolution of oil shale after high-temperature water vapor treatment |
| WANG Lei1，2，YANG Dong1，2，KANG Zhiqin1，2 |
| (1. Key Laboratory of In-situ Property Improving Mining of Ministry of Education，Taiyuan University of Technology，Taiyuan，Shanxi 030024，China；2. The In-situ Steam Injection Branch of State Center for Research and Development of Oil Shale Exploitation，Taiyuan University of Technology，Taiyuan，Shanxi 030024，China) |
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Abstract The internal structure of oil shale，as a sedimentary rock with obvious anisotropy，will change complexly in the process of pyrolysis with water vapor as heat carrier fluid. In order to study the influence of the steam temperature on the permeability and anisotropy of oil shale，a reaction device of oil pyrolysis by water vapor injection was designed. The permeability test of oil shale samples in parallel and vertical directions was carried out，and the permeability anisotropy coefficient was calculated. At the same time，the permeability of oil shale under different heating modes was compared. The results show that the permeability of oil shale in the direction vertical to the bedding is small with a maximum of 10－2 mD，and increases 2 933 times when the pyrolysis temperature increases from 314 ℃ to 382 ℃. The order of the permeability in the direction parallel to the bedding is much larger than that in the vertical direction. When the pyrolysis temperature increases from 382 ℃ to 555 ℃，the parallel permeability also increases significantly. It is also indicated that，when the pyrolysis temperature is 314 ℃，the permeability anisotropy coefficient reaches the maximum，and that，in the process of the pyrolysis temperature increasing from 382 ℃ to 555 ℃，the permeability anisotropy coefficient is small and basically increases slowly. The difference of the permeability of oil shale between steam heating and direct retorting is mainly reflected in the direction parallel to the bedding，and the permeability of oil shale in the direction parallel to the bedding after high-temperature water vapor treatment increases more significantly than that after direct retorting when the pyrolysis temperature increases from 314 ℃ to 382 ℃.
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2021, Vol. 40 
