Relationship between oil recovery and CO2 storage efficiency under the influence of gravity segregation in a CO2 EOR system

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• 作者：Jinju Han ; Hyemin Park ; Wonmo Sung
• 关键词：Gravity segregation ; CO2 EOR ; CO2 storage ; Oil recovery ; Miscibility ; CO2 injection rate
• 刊名：Environmental Earth Sciences
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：75
• 期：1
• 全文大小：1,486 KB
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• 作者单位：Jinju Han (1)
  Hyemin Park (1)
  Wonmo Sung (1)
  
  1. Department of Natural Resources and Environmental Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul, 133-791, Republic of Korea
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：None Assigned
• 出版者：Springer Berlin Heidelberg
• ISSN：1866-6299

文摘

Integrating the technologies of EOR and CO₂ sequestration could economically bring large quantities of CO₂ storage capacity and increase recoverable oil, which could be called 鈥済reen oil鈥? Gravity segregation, particularly in CO₂ gas flooding, is an important factor for the successful application of CO₂ flooding. A major goal of this study was to analyze how miscibility conditions and CO₂ injection rate affect both oil recovery and CO₂ storage efficiency under an environment of gravity segregation. This paper presents experimental observations of both EOR and CO₂ sequestration for CO₂ flooding in immiscible and near-miscible conditions at various CO₂ injection rates using two-dimensional vertical Berea sandstone slabs (20 脳 20 cm). The experiments were run under immiscible and near-miscible conditions with various CO₂ injection rates. CO₂ was injected continuously up to a maximum three-pore-volume injection into sandstone saturated with n-decane. From the results, both oil recovery and CO₂ storage efficiency in the near-miscible conditions were much better than the immiscible conditions in the case of a vertical system containing a gravity segregation environment. Ultimately, in the relationship between oil recovery and CO₂ storage efficiency, from this study, we propose that they behaved similarly, with a trend corresponding to the CO₂ injection rate in immiscible conditions, whereas they showed the opposite relationship in near-miscible conditions. Keywords Gravity segregation CO₂ EOR CO₂ storage Oil recovery Miscibility CO₂ injection rate