Capillary-Driven Transport of Dissolved Salt to the Drying Zone During \(\hbox {CO}_{2}\) Injection in Homogeneous and Layered Porous Media

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• 作者：Saskia M. Roels ; Ntiana El Chatib ; Costas Nicolaides…
• 关键词：$$\hbox {CO}_{2}$$ CO 2 sequestration ; Salt precipitation ; Core flooding ; Capillary ; driven flow
• 刊名：Transport in Porous Media
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：111
• 期：2
• 页码：411-424
• 全文大小：1,856 KB
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• 作者单位：Saskia M. Roels (1)
  Ntiana El Chatib (1)
  Costas Nicolaides (1)
  Pacelli L. J. Zitha (1)
  
  1. Delft University of Technology, Stevinweg 1, 2628 CN, Delft, The Netherlands
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Geotechnical Engineering
  Industrial Chemistry and Chemical Engineering
  Civil Engineering
  Hydrogeology
  Mechanics, Fluids and Thermodynamics
  
• 出版者：Springer Netherlands
• ISSN：1573-1634

文摘

A major challenge of \(\hbox {CO}_{2}\) injection into saline aquifers is the risk of formation clogging due to salt precipitation. Capillary-driven flow of brine can provide a continuous transport of dissolved salt toward the dry zone around the injection well where it ultimately precipitates due to evaporation. In this study, core flooding experiments were performed in homogeneous coarse-textured cores and in layered cores consisting of a coarse-textured layer overlying a fine-textured layer. \(\hbox {CO}_{2}\) was injected through a well in the upper part of the cores, and the bottom parts functioned as brine sources. Impairment in injectivity was found due to accumulation of precipitated salt caused by capillary-driven flow from the brine sources to the upper dryer region. Compared to flow domains without a brine source, we found that capillary-driven upward flow at first prevents complete clogging because the porous medium remains wet, but eventually leads to a more severe clogging of the entire domain. The results show that after sufficient dry-out, a coarse-textured injection layer can draw brine from an underlying fine-textured layer by capillary forces. A connected fine-textured layer can therefore contribute to salt precipitation and clogging of the injection layer. Keywords \(\hbox {CO}_{2}\) sequestration Salt precipitation Core flooding Capillary-driven flow