Department of Mechanical and Industrial Engineering and Institute for Sustainable Energy, University of Toronto , 5 King's College Road, Toronto, Ontario M5S 3G8, Canada.
Anal Chem. 2018 Feb 20;90(4):2461-2467. doi: 10.1021/acs.analchem.7b05358. Epub 2018 Feb 5.
Carbon capture, storage, and utilization technologies target a reduction in net CO emissions to mitigate greenhouse gas effects. The largest such projects worldwide involve storing CO through enhanced oil recovery-a technologically and economically feasible approach that combines both storage and oil recovery. Successful implementation relies on detailed measurements of CO-oil properties at relevant reservoir conditions (P = 2.0-13.0 MPa and T = 23 and 50 °C). In this paper, we demonstrate a microfluidic method to quantify the comprehensive suite of mutual properties of a CO and crude oil mixture including solubility, diffusivity, extraction pressure, minimum miscibility pressure (MMP), and contact angle. The time-lapse oil swelling/extraction in response to CO exposure under stepwise increasing pressure was quantified via fluorescence microscopy, using the inherent fluorescence property of the oil. The CO solubilities and diffusion coefficients were determined from the swelling process with measurements in strong agreement with previous results. The CO-oil MMP was determined from the subsequent oil extraction process with measurements within 5% of previous values. In addition, the oil-CO-silicon contact angle was measured throughout the process, with contact angle increasing with pressure. In contrast with conventional methods, which require days and ∼500 mL of fluid sample, the approach here provides a comprehensive suite of measurements, 100-fold faster with less than 1 μL of sample, and an opportunity to better inform large-scale CO projects.
碳捕集、封存和利用技术旨在减少净 CO 排放，以减轻温室气体的影响。全球最大的此类项目涉及通过强化采油来储存 CO，这是一种技术上和经济上可行的方法，结合了储存和采油。成功实施依赖于在相关储层条件（P = 2.0-13.0 MPa 和 T = 23 和 50°C）下对 CO-油性质进行详细测量。在本文中，我们展示了一种微流控方法，可定量测量 CO 与原油混合物的综合相互性质套件，包括溶解度、扩散系数、萃取压力、最小混相压力 (MMP) 和接触角。通过荧光显微镜定量测量了荧光油固有荧光特性，对 CO 暴露下逐级升压过程中的油膨胀/萃取进行了时间推移测量。通过膨胀过程确定了 CO 的溶解度和扩散系数，测量结果与先前的结果非常吻合。通过随后的油萃取过程确定了 CO-油 MMP，测量结果与先前值相差 5%以内。此外，在整个过程中测量了油-CO-硅的接触角，接触角随压力增加而增加。与需要数天和 ∼500 mL 流体样品的传统方法相比，该方法提供了一套全面的测量结果，速度快 100 倍，所需样品少于 1 μL，并有机会更好地为大规模 CO 项目提供信息。
