高温水蒸汽作用后油页岩渗透特性及各向异性演化的试验研究

doi:10.13722/j.cnki.jrme.2020.1072

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摘要油页岩是各向异性明显的沉积岩，以水蒸汽作为载热流体热解油页岩的过程中，岩体内部结构会发生复杂的变化。为了研究水蒸汽温度对油页岩渗透率及各向异性特征的影响规律，设计注水蒸汽热解油页岩的反应装置，对平行层理和垂直层理2个方向上的油页岩样品进行渗透率测试试验，计算得到渗透率各向异性系数，同时进行不同加热模式下油页岩渗透率的对比。研究结果显示：首先，垂直层理方向油页岩的渗透率较小，其量级最大也仅为10－2 mD，当热解温度从314 ℃增加到382 ℃的过程中，渗透率增幅明显，达到了2 933倍；其次，平行层理方向油页岩渗透率的量级要远大于垂直层理方向油页岩渗透率，当热解温度从382 ℃增加到555 ℃，渗透率增幅显著；再次，当热解温度为314 ℃时，渗透率各向异性系数达到最大值，热解温度从382 ℃增加到555 ℃的过程中，渗透率各向异性系数较小，基本上呈缓慢增加趋势；最后，蒸汽加热和直接干馏2种加热模式下油页岩渗透率的区别主要体现在平行层理方向上，当热解温度从314 ℃增加到382 ℃，高温水蒸汽作用后油页岩在平行层理方向渗透率的增大程度要显著于直接干馏模式。

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	王磊1
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	杨栋1
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	康志勤1
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关键词 ：岩石力学, 水蒸汽, 渗透率, 热破裂, 各向异性, 渗流场, 加热模式

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 ℃.

Key words： rock mechanics water vapor permeability thermal cracking anisotropy seepage field heating mode

引用本文:

王磊1，2，杨栋1，2，康志勤1，2. 高温水蒸汽作用后油页岩渗透特性及各向异性演化的试验研究[J]. 岩石力学与工程学报, 2021, 40(11): 2286-2295.
WANG Lei1，2，YANG Dong1，2，KANG Zhiqin1，2. Experimental study on permeability characteristics and anisotropy evolution of oil shale after high-temperature water vapor treatment. , 2021, 40(11): 2286-2295.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2020.1072 或 http://rockmech.whrsm.ac.cn/CN/Y2021/V40/I11/2286

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