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Migration behavior of supercritical and liquid CO2 in a stratified system: Experiments and numerical simulations

机译：超临界和液态二氧化碳在分层系统中的迁移行为：实验和数值模拟

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Multiple scenarios of upward CO2 migration driven by both injection-induced pressure and buoyancy force were investigated in a horizontally and vertically stratified core utilizing a core-flooding system with a 2-D X-ray scanner. Two reservoir-type scenarios were considered: (1) the terrestrial reservoir scenario (10 MPa and 50 degrees C), where CO2 exists in a supercritical state and (2) the deep-sea sediment reservoir scenario (28 MPa and 25 degrees C), where CO2 is stored in the liquid phase. The core-flooding experiments showed a 36% increase in migration rate in the vertical core setting compared with the horizontal setting, indicating the significance of the buoyancy force under the terrestrial reservoir scenario. Under both reservoir conditions, the injected CO2 tended to find a preferential flow path (low capillary entry pressure and high-permeability (high-k) path) and bypass the unfavorable pathways, leaving low CO2 saturation in the low-permeability (low-k) layers. No distinctive fingering was observed as the CO2 moved upward, and the CO2 movement was primarily controlled by media heterogeneity. The CO2 saturation in the low-k layers exhibited a more sensitive response to injection rates, implying that the increase in CO2 injection rates could be more effective in terms of storage capacity in the low-k layers in a stratified reservoir. Under the deep-sea sediment condition, the storage potential of liquid CO2 was more than twice as high as that of supercritical CO2 under the terrestrial reservoir scenario. In the end, multiphase transport simulations were conducted to assess the effects of heterogeneity on the spatial variation of pressure buildup, CO2 saturation, and CO2 flux. Finally, we showed that a high gravity number (N-gr) tended to be more influenced by the heterogeneity of the porous media.
机译：利用带二维X射线扫描仪的岩心驱替系统，在水平和垂直分层岩心中研究了由注入引起的压力和浮力共同驱动的向上CO2运移的多种情况。考虑了两种储层类型的情景：（1）陆上储层情景（10 MPa和50摄氏度），其中CO2以超临界状态存在；以及（2）深海沉积物储层情景（28 MPa和25摄氏度）。 ，其中CO2储存在液相中。岩心驱油实验表明，垂直岩心环境下的运移速率与水平岩心环境相比提高了36％，这表明在地面储层情景下浮力的重要性。在两种储层条件下，注入的CO2倾向于找到优先的流动路径（低毛细管进入压力和高渗透率（高k）路径）并绕过不利的路径，从而在低渗透率（low-k）中留下低CO2饱和度）层。由于CO2向上移动，未观察到明显的指法，并且CO2移动主要受介质异质性控制。低k层中的CO2饱和度对注入速率表现出更敏感的响应，这意味着就分层储层中低k层中的存储容量而言，增加CO2注入速率可能更有效。在深海沉积条件下，在陆相储层中，液态二氧化碳的储存潜力是超临界二氧化碳的两倍以上。最后，进行了多相输运模拟，以评估非均质性对压力累积，CO2饱和度和CO2通量的空间变化的影响。最后，我们表明，高重力值（N-gr）往往受到多孔介质非均质性的影响。

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  • 来源
    《Water resources research》 |2015年第10期|7937-7958|共22页
  • 作者

    Oh Junho; Kim Kue-Young; Han Weon Shik; Park Eungyu; Kim Jeong-Chan;

  • 作者单位

    Korea Inst Geosci & Mineral Resources, Daejeon, South Korea|Kyungpook Natl Univ, Dept Geol, Daegu, South Korea;

    Korea Inst Geosci & Mineral Resources, Daejeon, South Korea;

    Univ Wisconsin, Dept Geosci, Milwaukee, WI 53201 USA;

    Kyungpook Natl Univ, Dept Geol, Daegu, South Korea;

    Korea Inst Geosci & Mineral Resources, Daejeon, South Korea;

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