Analytical model for simulating and analyzing the influence of interfacial slip on fracture height propagation in shale gas layers

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• 作者：Jinzhou Zhao ; Yu Peng ; Yongming Li ; Wenlian Xiao
• 关键词：Hydraulic fracturing ; Interfacial slip ; Shale gas ; Fracture height ; Treating pressure
• 刊名：Environmental Earth Sciences
• 出版年：2015
• 出版时间：May 2015
• 年：2015
• 卷：73
• 期：10
• 页码：5867-5875
• 全文大小：1,271 KB
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• 作者单位：Jinzhou Zhao (1)
  Yu Peng (1)
  Yongming Li (1)
  Wenlian Xiao (1)
  
  1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, 610500, China
  
• 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

During hydraulic fracturing, fractures with interfacial slip are distorted into complex geometries with horizontal components that prevent simulations by the conventional fracture height propagation models. Interfacial slip is a general phenomenon caused by structural weak interfaces in shale gas, such as natural fractures with different angles, thin interlayers and structure disconformity planes. This paper aims to study the influence of interfacial slip on fracture height propagation and investigate measures to prevent fracture height overgrowth during shale gas fracturing simulations. To know the effect of interfacial slip on hydraulic fracture height propagation clearly, this paper introduces the K criterion and COD criterion to establish a new analytical model based on the equivalent planar fracture assumption to simulate fracture height propagation with interfacial slip. The computed results show the difference between the K criterion fracture height propagation model and the COD criterion fracture height propagation model is tiny due to the two criterions having the same function in fracture mechanics. The results also show that the pressure drop caused by vertical distorting structures could be higher than the stress difference between the upper layer and the pay layer, so that the interfacial slip has a significant controlling effect on hydraulic fracture height propagation; and the interfacial slip is one of the reasons why the observed fracture height was always lower than the one predicted by conventional models. However, in shale gas fracturing, the extremely high net pressure caused by high treating pressure and pumping speed in very special treatments still has the possibility to drive the fracture height to propagate and decrease stimulated reservoir volume. Therefore, the influence of interfacial slip on fracture height propagation must be taken into consideration in shale gas fracturing simulations, and in some cases, the net pressure should also be restrained to avoid fracture height overgrowth.