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Convection and Diffusion of Supercritical Carbon Dioxide in High-Pressure Porous Media Filled with Water

超临界二氧化碳在高压多孔介质中的对流与扩散

基本信息

批准号：
13450081
负责人：
HIRAI Shuichiro
金额：
$ 8.96万
依托单位：
Tokyo Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2003
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-13450081/
关键词：
geological sequestration carbon dioxide porous media MRI LBM 北中隔離

项目摘要

This paper describes experimental and numerical research on two-phase flow of supercritical CO_2 and water in porous media under sequestration conditions. We used a magnetic resonance imaging technique to directly visualize the distribution of supereritical CO_2 injected into porous media containing water. in situ water saturation distributions in a Berea sandstone core and a packed bed of glass beads were successfully visualized under conditions that simulate those at 700 -1000-m depths in an aquifers at the depth in the range from 700m to 1000m. By applying the coreflood interpretation method to our saturation data, we could describe the local Darcy phase velocities as a function of saturation. Finally, the effect of buoyancy on displacement process and gravity dominated pure counter-current flow is discussed by comparing the data obtained at two conditions that model the aquifers at depths of 1000 m and 700 m. We found that buoyancy largely controls the pure counter-current flow in … More well permeable porous media for conditions at 700 and 1000-m depths. We had developed a numerical code, which simulates two-phase flow of supercritical C0_2 and water in porous media including the effect of interfacial tension, wettability, buoyancy, and viscosity ratio, by a lattice Boltzmann method. A present study shows that the wettability and interfacial tension affect the relative permeability to deviate from Darcy law at low body forces such as buoyancy. Therefore, the effect of wettability and interfacial tension on the relative permeability should be taken into account to estimate the long-term fate of sequestered C0_2 by large-scalp reservoir simulations. The relative permeability of C0_2 decreases with an increase of the capillary pressure of water, As a result, the capillary pressure could make the flow of C0_2 slower than that has estimated in former simulations. Since the effect of the capillary pressure is significant in cap-rocks, the deviation from Darcy law is vital to the leakage of C0_2 through the cap-rocks. Less

本文对超临界co2与水在多孔介质中固存条件下的两相流动进行了实验和数值研究。利用磁共振成像技术直接观察了注入含水多孔介质中超临界CO_2的分布。在模拟700 ~ 1000米含水层700 ~ 1000米深度的条件下，成功地可视化了Berea砂岩岩心和玻璃微珠充填层的原位水饱和度分布。通过将岩心注水解释方法应用于饱和度数据，我们可以将局部达西相速度描述为饱和度的函数。最后，通过对比1000 m和700 m两种条件下模拟含水层的数据，讨论了浮力对位移过程和重力主导的纯逆流的影响。我们发现浮力在很大程度上控制了700米和1000米深度条件下的纯逆流。利用晶格玻尔兹曼方法，建立了一个数值程序，模拟了超临界co2和水在多孔介质中的两相流动，包括界面张力、润湿性、浮力和粘度比的影响。目前的研究表明，在浮力等低体力作用下，润湿性和界面张力影响相对渗透率偏离达西定律。因此，应考虑润湿性和界面张力对相对渗透率的影响，通过大头皮油藏模拟来估计封存co2的长期命运。随着水毛管压力的增大，C0_2的相对渗透率降低，毛管压力使C0_2的流动速度比以往的模拟结果慢。由于毛管压力在盖层中的作用是显著的，因此偏离达西定律对co2通过盖层的泄漏至关重要。少