Impact of water and nitrogen fracturing fluids on fracturing initiation pressure and flow pattern in anisotropic shale reservoirs

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• 作者：Xiangxiang Zhang^a ; J.G. Wang^a ; ^b ; ^{nuswjg@yahoo.com" class="auth_mail" title="E-mail the corresponding author} ; Feng Gao^a ; ^b ; Yang Ju^a ; ^c ; Jia Liu^b
• 关键词：Anisotropic shale ; Hydrofracturing ; Moving mesh ; Fracturing initiation pressure ; Seepage area
• 刊名：Computers and Geotechnics
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：81
• 期：Complete
• 页码：59-76
• 全文大小：2715 K

文摘

A numerical model is proposed to investigate the impact of water and nitrogen fracturing fluids on the fracturing initiation pressure and the flow pattern in anisotropic shale reservoirs. This model considers the anisotropy of shale deformation and permeability, the compressibility of fracturing fluid, and the fluid moving front. A crack initiation criterion is established with the stress intensity factor of mode I crack. Both crack initiation pressure and seepage area are verified and analyzed. These results show that shale deformation and permeability anisotropy, fracturing fluid compressibility, viscosity, and pressurization rate have significant impacts on fracturing initiation pressure and seepage area.