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Rheology and diffusivity of bitumen with liquid and supercritical CO_2

机译：液态和超临界CO_2沥青的流变学和扩散性

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摘要

Carbon dioxide (CO2) sequestration in depleted reservoirs is a practical solution to mitigate the emission of greenhouse gases. In financial considerations of the CO2 sequestration projects, CO2 can be considered as a solvent which can mobilize stranded oils underground. In this paper, we apply our novel high-pressure rheometry coupled with the pressure-decay technique, developed in our previous studies, to precisely determine the viscosities and mutual diffusivities for mixtures of bitumen with CO2 at the temperature range of 30 degrees C-110 degrees C and at pressures as high as 10 MPa, where CO2 is in liquid or supercritical forms. The developed novel technique overcomes the shortcomings of the pressure decay method by significant reduction in the experimentation time and eliminating uncertainties in determining the equilibrium pressure values. The reduced variable model is successfully adopted to describe the effects of temperature, pressure and CO2 concentration on the viscosity of the mixtures. The viscosity data for the mixtures show a continuous drop regardless of the state of CO2. Unlike the viscosity values, the diffusivity of CO2 into the bitumen is dependent on the state and pressure of CO2. The diffusivity values increase with temperature which are well described by the Arrhenius equation. While pressure had a significant effect on the diffusivity values in the gaseous state, shown in our previous study, the diffusivity values are less sensitive to pressure in the liquid and supercritical forms. It is also found that liquid CO2 has the highest diffusivity in bitumen compared to supercritical and gaseous CO2. The diffusivity values were compared to the few data in the literature for pressures above 10 MPa for CO2-bitumen mixtures.
机译：在枯竭的水库中封存二氧化碳（CO2）是减轻温室气体排放的切实可行的解决方案。从二氧化碳封存项目的财务考虑，可以将二氧化碳视为可以将滞留油运到地下的溶剂。在本文中，我们将我们先前研究中开发的新型高压流变仪与压力衰减技术结合使用，以精确确定在30摄氏度C-110温度范围内沥青与CO2混合物的粘度和相互扩散率，温度高达10 MPa，CO2呈液态或超临界形式。所开发的新技术通过显着减少实验时间并消除了确定平衡压力值的不确定性，从而克服了压力衰减方法的缺点。成功地采用了减少变量模型来描述温度，压力和CO2浓度对混合物粘度的影响。混合物的粘度数据显示连续下降，而与CO2的状态无关。与粘度值不同，CO2在沥青中的扩散率取决于CO2的状态和压力。扩散率值随温度增加而增加，这由Arrhenius方程很好地描述。如我们先前的研究所示，虽然压力对气态扩散系数具有显着影响，但扩散系数对液态和超临界形式的压力较不敏感。还发现与超临界和气态二氧化碳相比，液态二氧化碳在沥青中的扩散率最高。将扩散率值与文献中有关CO2沥青混合物的压力高于10 MPa的一些数据进行比较。

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  • 来源
    《Fuel》 |2019年第15期|431-438|共8页
  • 作者

    Behzadfar Ehsan; Karamikamkar Solmaz; Hatzikiriakos Savvas G.;

  • 作者单位

    Lakehead Univ, Dept Chem Engn, Thunder Bay, ON P7B 5E1, Canada;

    Univ Toronto, Dept Mech & Ind Engn, Toronto, ON M5S 3G8, Canada;

    Univ British Columbia, Dept Chem & Biol Engn, Vancouver, BC V6T 1Z3, Canada;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Diffusivity; Pressure-decay; Rheometry; CO2; Bitumen;

    机译：扩散率;压力衰减;流变学;CO2;位;

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