Volume 46 Issue 2
Apr.  2018
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LUO Zhongshan, CAO Han, SUN Pinghe, PENG Canwei, NI Zhunlin. Influence of hydraulic fracturing pulse frequency on precasting sealing effect of coal rock[J]. COAL GEOLOGY & EXPLORATION, 2018, 46(2): 190-195. DOI: 10.3969/j.issn.1001-1986.2018.02.029
Citation: LUO Zhongshan, CAO Han, SUN Pinghe, PENG Canwei, NI Zhunlin. Influence of hydraulic fracturing pulse frequency on precasting sealing effect of coal rock[J]. COAL GEOLOGY & EXPLORATION, 2018, 46(2): 190-195. DOI: 10.3969/j.issn.1001-1986.2018.02.029
shu

Influence of hydraulic fracturing pulse frequency on precasting sealing effect of coal rock

  • 1. Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring of Ministry of Education, Central South University, Changsha 410083, China;

  • 2. School of Geosciences and Info-Physics, Central South University, Changsha 410083, China;

  • 3. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China

Funds: 

National Natural Science Foundation of China(41302124)

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  • Received Date: June 11, 2017
  • Published Date: April 24, 2018
    Graphical Abstract
    • Abstract
  • The technology of pulsed hydraulic fracluring is an important means to transform low permeability reservoir, through the double action of water wedge effect and pulse fatigue damage, the fracture network is communicated to improve the conductivity of low permeability reservoir. In the laboratory test of pulsating hydraulic fracturing, the sealing problem of prefabricated hole in the sample is the key to determine the success of hydraulic fracturing test. The initiation pressure is also an important index to evaluate the sealing effect of pulse sealing section. In this paper, the relationship of the mechanical properties between the weak joint surface of the sealing section and coal rock is established, and the influence of different frequencies on the initiation pressure of coal rock is established, and the influence of different frequencies on the initiation pressure of coal rock is studied. Finally, based on the initiation pressure, the fitting of the damage value of initiation pressure obtained that empirical formula of prefabricated hole sealing pressure, gived a basis for sealing of pulse hydraulic fracturing.
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    • References (19)
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