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首页> 外文期刊>Environmental Science & Technology >Experimental Study of Crossover from Capillary to Viscous Fingering for Supercritical CO_2-Water Displacement in a Homogeneous Pore Network
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Experimental Study of Crossover from Capillary to Viscous Fingering for Supercritical CO_2-Water Displacement in a Homogeneous Pore Network

机译：均相孔网中超临界CO_2-水置换的毛细管指状到粘性指状交叉的实验研究

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Carbon sequestration in saline aquifers involves displacing brine from the pore space by supercritical CO_2 (scCO_2). The displacement process is considered unstable due to the unfavorable viscosity ratio between the invading scCO_2 and the resident brine. The mechanisms that affect scCO_2-water displacement under reservoir conditions (41 ℃, 9 MPa) were investigated in a homogeneous micrornodel. A large range of injection rates, expressed as the dimensionless capillary number (Ca), was studied in two sets of experiments: discontinuous-rate injection, where the micrornodel was saturated with water before each injection rate was imposed, and continuous-rate injection, where the rate was increased after quasi-steady conditions were reached for a certain rate. For the discontinuous-rate experiments, capillary fingering and viscous fingering are the dominant mechanisms for low (logCa ≤ -6.6l) and high injection rates (logCa ≥ -5.21), respectively. Crossover from capillary to viscous fingering was observed for logCa = -5.91 to -5.21, resulting in a large decrease in scCO_2 saturation. The discontinuous-rate experimental results confirmed the decrease in nonwetting fluid saturation during crossover from capillary to viscous fingering predicted by numerical simulations by Lenormand et al. (J. Fluid Meck 1988, 189, 165-187). Capillary fingering was the dominant mechanism for all injection rates in the continuous-rate experiment, resulting in monotonic increase in scCO_2 saturation.
机译：盐水层中的碳固存涉及通过超临界CO_2（scCO_2）置换孔隙空间中的盐水。由于侵入的scCO_2与驻留盐水之间的不利粘度比，驱替过程被认为是不稳定的。以均一的微型管研究了在储层条件（41℃，9 MPa）下影响scCO_2-水驱替的机理。在两组实验中研究了大范围的注入速率，表示为无量纲毛细管数（Ca）：不连续速率注入，其中在施加每种注入速率之前微纳德水饱和，以及连续速率注入，准稳态条件达到一定速率后速率增加。对于不连续速率实验​​，毛细管指法和粘性指法分别是低（logCa≤-6.6l）和高注入速率（logCa≥-5.21）的主要机制。 logCa = -5.91至-5.21观察到了从毛细管指状到粘性指状的交叉，导致scCO_2饱和度大大降低。不连续速率的实验结果证实了由Lenormand等人的数值模拟预测的从毛细管指状到粘性指状过渡期间非润湿液饱和度的降低。 （J.Fluid Meck 1988，189，165-187）。在连续速率实验​​中，毛细管指法是所有注入速率的主要机制，导致scCO_2饱和度单调增加。

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  • 来源
    《Environmental Science & Technology》 |2013年第1期|212-218|共7页
  • 作者

    Ying Wang; Changyong Zhang; Ning Wei; Mart Oostrom; Thomas W. Wietsma; Xiaochun Li; Alain Bonneville;

  • 作者单位

    State Key Laboratory for Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China;

    Pacific Northwest National Laboratory, 902 Battelle Boulevard, P.O. Box 999, MSIN K8-96, Richland, Washington 99352, United States;

    State Key Laboratory for Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China;

    Pacific Northwest National Laboratory, 902 Battelle Boulevard, P.O. Box 999, MSIN K8-96, Richland, Washington 99352, United States;

    Pacific Northwest National Laboratory, 902 Battelle Boulevard, P.O. Box 999, MSIN K8-96, Richland, Washington 99352, United States;

    State Key Laboratory for Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China;

    Pacific Northwest National Laboratory, 902 Battelle Boulevard, P.O. Box 999, MSIN K8-96, Richland, Washington 99352, United States;

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