A new approach to obtaining relative permeability curves during chemical flooding process in a low-permeable reservoir

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• 作者：Yu Zhao ; Kaoping Song ; Mingxing Bai ; Ning Sun
• 关键词：Low permeable ; Chemical flooding ; Relative permeability ; Modified capillary number ; Pore–throat radius ratio ; Wettability ; Interfacial tension
• 刊名：Environmental Earth Sciences
• 出版年：2015
• 出版时间：June 2015
• 年：2015
• 卷：73
• 期：11
• 页码：7001-7009
• 全文大小：1,020 KB
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• 作者单位：Yu Zhao (1)
  Kaoping Song (1)
  Mingxing Bai (1) (2)
  Ning Sun (1)
  
  1. Department of Petroleum Engineering, Northeast Petroleum University, Daqing, 163318, China
  2. Institute of Petroleum Engineering, Clausthal University of Technology, 38678, Clausthal-Zellerfeld, Germany
  
• 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

It is always difficult to obtain the relative permeability curve for a low-permeable reservoir using chemical flooding, as there are so many problems associated with the current measurement methods, especially when interfacial tension σ, wettability cosθ and pore–throat radius ratio m are considered as the main factors that influence the shape of the relative permeability curve, and thereby the oil recovery. This paper presents a new concept of modified capillary numbers (N _CM), associated with these three factors. First, laboratory experiments were carried out to get relationship between N _CM and the residual oil saturation S _OR under different conditions. Second, oil–water relative permeability curves for a target oil layer using the steady-state flow method were determined. Using these two steps, a relative permeability curve under different conditions of interfacial tension σ, wettability cosθ and pore–throat radius ratio m has been drawn. Based on the calculated relative permeability curves, the oil displacement efficiency and flow capacity were determined. Subsequently, the relationships between the relative permeability curve, oil displacement efficiency, flow capacity and the factors for a low-permeable reservoir were established using chemical flooding.