Experimental evaluation on well pattern adaptability of ultra-low permeability reservoir using sandstone flat model

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• 作者：Qian-hua Xiao (1)
  Guo-qi Wei (1) (2)
  Zheng-ming Yang (1) (2)
  Xuan Xu (2)
  Wen-bo Tian (1)
  Ya-pu Zhang (2)
  
• 关键词：micro ; fractured development ; sandstone flat model ; adaptability of well pattern ; pressure sweep efficiency ; deliverability index
• 刊名：Journal of Central South University
• 出版年：2014
• 出版时间：June 2014
• 年：2014
• 卷：21
• 期：6
• 页码：2334-2340
• 全文大小：
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• 作者单位：Qian-hua Xiao (1)
  Guo-qi Wei (1) (2)
  Zheng-ming Yang (1) (2)
  Xuan Xu (2)
  Wen-bo Tian (1)
  Ya-pu Zhang (2)
  
  1. Institute of Porous Flow and Fluid Mechanics, China Academy of Sciences, Langfang, 065007, China
  2. Langfang Branch, Petro China Exploration and Development Research Institute, Langfang, 065007, China
  
• ISSN：2227-5223

文摘

As for ultra-low permeability reservoir, the adaptability of common nine-spot well pattern is studied through large-scale flat models made by micro-fractured natural sandstone outcrops. Combined with non-linear porous flow characteristics, the concept of dimensionless pressure sweep efficiency and deliverability index are put forward to evaluate the physical models-well pattern adaptability. Through experiments, the models-pressure distribution is measured and on which basis, the pressure gradient fields are drawn and the porous flow regions of these models are divided into dead oil region, non-linear porous flow region, and quasi-linear porous flow region with the help of twin-core non-linear porous flow curve. The results indicate that rectangular well pattern in fracture reservoirs has the best adaptability, while the worst is inverted nine-spot equilateral well pattern. With the increase of drawdown pressure, dead oil region decreases, pressure sweep efficiency and deliverability index increase; meantime, the deliverability index of rectangular well pattern has much more rational increase. Under the same drawdown pressure, the rectangular well pattern has the largest pressure sweep efficiency.