Volume 45 Issue 6
Dec.  2017
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ZHANG Fan, MA Geng, LIU Xiao, FENG Dan. Experimental study on initiation pressure and mechanism of fracture propagation of hydraulic fracturing in coal and rock mass[J]. COAL GEOLOGY & EXPLORATION, 2017, 45(6): 84-89. DOI: 10.3969/j.issn.1001-1986.2017.06.014
Citation: ZHANG Fan, MA Geng, LIU Xiao, FENG Dan. Experimental study on initiation pressure and mechanism of fracture propagation of hydraulic fracturing in coal and rock mass[J]. COAL GEOLOGY & EXPLORATION, 2017, 45(6): 84-89. DOI: 10.3969/j.issn.1001-1986.2017.06.014
shu

Experimental study on initiation pressure and mechanism of fracture propagation of hydraulic fracturing in coal and rock mass

  • 1. School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China;

  • 2. Research Institute of Henan Energy Resource and Chemical Industry Group Co., Ltd., Zhengzhou 450046, China;

  • 3. Collaborative Innovation Center of Coalbed Methane and Shale Gas for Central Plains Economic Region, Jiaozuo 454003, China;

  • 4. State Key Laboratory for Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China

Funds: 

Key Project of Science and Technology Research of Henan Provincial Department of Education(13A440320)

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  • Received Date: December 09, 2016
  • Published Date: December 24, 2017
    Graphical Abstract
    • Abstract
  • To study the hydraulic fracturing initiation pressure and mechanism of fracture propagation in coal and rock mass, the physical simulation experiment program "exerting three-dimensional stresses-injecting fluid from the top" of coalbed hydraulic fracturing was established based on engineering applications by using briquette samples and self-developed hydraulic fracturing testing system. According to the above program combining the existing experimental conditions, the water pressure and hydraulic fracture were analyzed under varied conditions. The experimental results show that initiation pressure increases in the process of increasing flow rate. Hydraulic fractures propagate along the direction perpendicular to σh under the condition of σH > σv > σh. With the increase of σH, the initiation pressure of coal rock increases at first and then decreases when σv and σh are constant, in addition, the fracture propagation path becomes more straight. As σH is much larger than σv and σh, the fracture propagation path gets more complex and the angle of bifurcate fractures is larger. The results are of significance and importance for the improvement of hydraulic fracturing theory in coal rock mass.
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    • References (21)
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