Research and application of anti-reflection technology of hydraulic fracturing

doi:10.16265/j.cnki.issn 1003-3033.2020.10.009

Abstract

Abstract: In order to solve problems of low permeability and low gas extraction rate in coal seams, permeability enhancement of hydraulic fracturing was numerically simulated by using discrete element software RFPA^2D-flow. Firstly, effect of different water pressure on single-hole fracture propagation was simulated. Secondly, multi-point hydraulic fracturing was simulated, and influence of single fracturing of center hole and simultaneous fracturing of peripheral hole on development state of crack growth was analyzed. Finally, taking Mabao coal mine as working background, anti-reflection effect of hydraulic fracturing was comprehensively evaluated based on theoretical analysis and research and field industrial test. The results show that redistribution of borehole stress can ensure accuracy and reliability of numerical simulation results. Induced stress can affect propagation direction of fracture developed later, making it easier to form a network structure with that developed first, thus verifying anti-reflection mechanism of hydraulic fracturing. In addition, when water pressure is 27 MPa, simulation result of effective radius of fracturing is 2.8 m, which is basically consistent with actual radius of 3 m.

Key words: hydraulic fracturing, coal seam anti-reflection, gas drainage, numerical simulation, effective radius

CLC Number:

X936

JIA Jinzhang, GE Jiaqi, ZHEN Wenhao, ZHAO Dan. Research and application of anti-reflection technology of hydraulic fracturing[J]. China Safety Science Journal, 2020, 30(10): 63-68.

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