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Applied Geophysics

, Volume 16, Issue 2, pp 243–251 | Cite as

Crack propagation and hydraulic fracturing in different lithologies

  • Zhen-Kun Hou
  • Han-Lie ChengEmail author
  • Shu-Wei Sun
  • Jun Chen
  • Dian-Qing Qi
  • Zhi-Bo Liu
Production Geophysics

Abstract

We simulated hydraulic fracturing in different lithologic rocks in the horizontal drilling by using the true physical model experiment and large rock specimens, carried out the real-time dynamic monitoring with adding tracer and then did post-fracturing cutting and so on. Based on this monitoring results, we compared and assessed the factors affecting expansion in shale, shell limestone, and tight sandstone and the fracture expansion in these rocks. In shale, the reformed reservoir volume is the highest, fracture network is formed in the process of fracturing. In tight sandstone, the fracture surface boundaries are curved, and the fracture surface area accounts for 25–50% of the entire specimen. In shell limestone, the complexity of the fracture morphology is between shale and tight sandstone, but no fracture network is developed. Brittleness controls the fracture surface area. In highly brittle rocks, the fracture surface area is high. Fracture toughness mainly affects the initiation and propagation of cracks. A fracture network is formed only if bedding planes are present and are more weaker than their corresponding matrix. The horizontal in situ deviatoric stress affects the crack propagation direction, and different lithologies have different horizontal in situ deviatoric stress thresholds. Low fluid injection rate facilitates the formation of complex cracks, whereas high fluid injection rate favors the development of fractures. Fluid injection weakly controls the complexity of hydraulic fracturing in low-brittleness rocks, whereas low-viscosity fracturing fluids favor the formation of complex cracks owing to easy enter microcracks and micro-pore. Displacement has a greater impact on high brittle rocks than low brittle rocks.

Keywords

shale limestone sandstone hydraulic fracturing crack propagation rock mechanics 

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Copyright information

© The Editorial Department of APPLIED GEOPHYSICS 2019

Authors and Affiliations

  • Zhen-Kun Hou
    • 1
  • Han-Lie Cheng
    • 2
    Email author
  • Shu-Wei Sun
    • 3
  • Jun Chen
    • 4
  • Dian-Qing Qi
    • 2
  • Zhi-Bo Liu
    • 2
  1. 1.Guangzhou Institute of Building Science Co., Ltd.GuangzhouChina
  2. 2.LandOcean Energy Services Co., Ltd.BeijingChina
  3. 3.School of Energy and Mining EngineeringChina University of Mining and Technology (Beijing)BeijingChina
  4. 4.No.4 Oil Production PlantHuabei Oil Field Ltd., PetroChinaLangfangP.R. China

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