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Laboratory investigation of hydraulic fracture networks in formations with continuous orthogonal fractures

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  • Fan, Tie-gang
  • Zhang, Guang-qing

Abstract

Researchers have recently realized that hydraulic fracture networks are significant for the exploitation of unconventional reservoirs (tight gas, shale gas, coalbed methane, etc.). Studies have shown that slickwater fracturing treatments can create complex fractures that increase the ‘stimulated reservoir volume’ in naturally fractured formations. However, the influence of the created hydraulic fracture network is not well understood. Laboratory experiments are proposed to study the evolution of hydraulic fracture networks in naturally fractured formations with specimens that contain two groups of orthogonal cemented fractures. The influence of dominating factors was studied and analyzed, with an emphasis on natural fracture density and injection rate. We concluded that hydraulic fracture networks are formed by the interactive process between the reopening and connecting of the natural fractures through slickwater fracturing in the specimens, indicated by frequent pressure fluctuations. The spatial envelope of the fracture network is an approximate ellipsoid with the major axis deviating from the orientation of the maximum horizontal stress. It is suggested from the pressure curve that great natural fracture density and high injection rates tend to raise the treatment pressure and the pressure profiles could reflect different characteristics of extending behaviors.

Suggested Citation

  • Fan, Tie-gang & Zhang, Guang-qing, 2014. "Laboratory investigation of hydraulic fracture networks in formations with continuous orthogonal fractures," Energy, Elsevier, vol. 74(C), pages 164-173.
    • Handle: RePEc:eee:energy:v:74:y:2014:i:c:p:164-173
    DOI: 10.1016/j.energy.2014.05.037
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    References listed on IDEAS

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    1. McGlade, Christophe & Speirs, Jamie & Sorrell, Steve, 2013. "Unconventional gas – A review of regional and global resource estimates," Energy, Elsevier, vol. 55(C), pages 571-584.
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    2. Yu, Likui & Wu, Xiaotian & Hassan, N.M.S. & Wang, Yadan & Ma, Weiwu & Liu, Gang, 2020. "Modified zipper fracturing in enhanced geothermal system reservoir and heat extraction optimization via orthogonal design," Renewable Energy, Elsevier, vol. 161(C), pages 373-385.
    3. Jihuan Wu & Xuguang Li & Yu Wang, 2023. "Insight into the Effect of Natural Fracture Density in a Shale Reservoir on Hydraulic Fracture Propagation: Physical Model Testing," Energies, MDPI, vol. 16(2), pages 1-17, January.
    4. Jianxiong Li & Shiming Dong & Wen Hua & Yang Yang & Xiaolong Li, 2019. "Numerical Simulation on Deflecting Hydraulic Fracture with Refracturing Using Extended Finite Element Method," Energies, MDPI, vol. 12(11), pages 1-19, May.
    5. Yuxiang Cheng & Yanjun Zhang, 2020. "Experimental Study of Fracture Propagation: The Application in Energy Mining," Energies, MDPI, vol. 13(6), pages 1-31, March.
    6. Xu, Chao & Ma, Sibo & Wang, Kai & Yang, Gang & Zhou, Xin & Zhou, Aitao & Shu, Longyong, 2023. "Stress and permeability evolution of high-gassy coal seams for repeated mining," Energy, Elsevier, vol. 284(C).
    7. Jianming He & Chong Lin & Xiao Li & Xiaole Wan, 2016. "Experimental Investigation of Crack Extension Patterns in Hydraulic Fracturing with Shale, Sandstone and Granite Cores," Energies, MDPI, vol. 9(12), pages 1-16, December.
    8. Zhihong Lei & Yanjun Zhang & Zhongjun Hu & Liangzhen Li & Senqi Zhang & Lei Fu & Gaofan Yue, 2019. "Application of Water Fracturing in Geothermal Energy Mining: Insights from Experimental Investigations," Energies, MDPI, vol. 12(11), pages 1-22, June.
    9. Zhou, Yan & Guan, Wei & Cong, Peichao & Sun, Qiji, 2022. "Effects of heterogeneous pore closure on the permeability of coal involving adsorption-induced swelling: A micro pore-scale simulation," Energy, Elsevier, vol. 258(C).
    10. Zhao, Liqiang & Chen, Yixin & Du, Juan & Liu, Pingli & Li, Nianyin & Luo, Zhifeng & Zhang, Chencheng & Huang, Fushan, 2019. "Experimental Study on a new type of self-propping fracturing technology," Energy, Elsevier, vol. 183(C), pages 249-261.
    11. Jianming He & Lekan Olatayo Afolagboye & Chong Lin & Xiaole Wan, 2018. "An Experimental Investigation of Hydraulic Fracturing in Shale Considering Anisotropy and Using Freshwater and Supercritical CO 2," Energies, MDPI, vol. 11(3), pages 1-13, March.
    12. He, Jianming & Li, Xiao & Yin, Chao & Zhang, Yixiang & Lin, Chong, 2020. "Propagation and characterization of the micro cracks induced by hydraulic fracturing in shale," Energy, Elsevier, vol. 191(C).
    13. Josifovic, Aleksandar & Roberts, Jennifer J. & Corney, Jonathan & Davies, Bruce & Shipton, Zoe K., 2016. "Reducing the environmental impact of hydraulic fracturing through design optimisation of positive displacement pumps," Energy, Elsevier, vol. 115(P1), pages 1216-1233.
    14. Zhaohui Chong & Qiangling Yao & Xuehua Li, 2019. "Experimental Investigation of Fracture Propagation Behavior Induced by Hydraulic Fracturing in Anisotropic Shale Cores," Energies, MDPI, vol. 12(6), pages 1-16, March.
    15. Zheng, Peng & Xia, Yucheng & Yao, Tingwei & Jiang, Xu & Xiao, Peiyao & He, Zexuan & Zhou, Desheng, 2022. "Formation mechanisms of hydraulic fracture network based on fracture interaction," Energy, Elsevier, vol. 243(C).

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