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Influence of Water Injection Fracturing on Crack Damage in Soft Coal and Application in Gas Extraction

DOI: 10.4236/jpee.2014.24001    1,939 Downloads   2,527 Views   Citations

ABSTRACT

In order to study the hypotonic and rheological particularity of “three soft” coal seam in west Henan, China, this paper explored the stress and damage characteristics of crack in coal under condition of water injection fracturing based on ABAQUS platform; The cohesive element in T-P damage evolution criterion was used to describe the approximately linear relationship between crack width and extending distance in soft coal. The simulation results show that stress evolution and crack damage in soft coal is a gradually developing process under condition of water injection fracturing. When the static pressure is 4 - 10 MPa, and the injection time is about 1 - 2 hours, the damage range of crack in soft coal can basically reach an ideal data of 80 - 100 m, and then greatly improve the hypotonic performance of “three soft” coal seam.

Conflicts of Interest

The authors declare no conflicts of interest.

Cite this paper

Wang, Z. , Jin, J. , Hang, Z. and Hu, X. (2014) Influence of Water Injection Fracturing on Crack Damage in Soft Coal and Application in Gas Extraction. Journal of Power and Energy Engineering, 2, 1-6. doi: 10.4236/jpee.2014.24001.

References

[1] Wang, Z.R., Chen, L.X., Cheng, C.R. and Li, Z.X. (2007) Forecast of Gas Geological Hazards for “Three-Soft” Coal Seams in Gliding Structural Areas. Journal of China University of Mining and Technology, 17, 484-488. http://dx.doi.org/10.1016/S1006-1266(07)60130-8
[2] Meyer, B.R. and Bazan, L.W. (2011) A Discrete Fracture Network Model for Hydraulically Induced Fractures Theory. SPE Hydraulic Fracturing Technology Conference, The Woodlands, 24-26 January 2011, 216-225.
[3] Olson, J.E. and Dahi-Taleghani, A. (2009) Modeling Simultaneous Growth of Multiple Hydraulic Fractures and Their Interaction with Natural Fractures. SPE Hydraulic Fracturing Technology Conference, The Woodlands, 19-21 January 2009, 118-121.
[4] Wang, J.J., Zhang, H.P., Zhao, M.J. and Lin, X. (2009) Mechanisms of Hydraulic Fracturing in Cohesive Soil. Water Science and Engineering, 2, 95-102.
[5] Sommerton, W.J., Soylemezoglu, I.M. and Dudley, R.C. (1975) Effect of Stress on Permeability of Coal. International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, 12, 129-145. http://dx.doi.org/10.1016/0148-9062(75)91244-9
[6] Tang, J.P., Pan, Y.S., Li, C.Q. and Shi, Q. (2006) Experimental Study of Desorption and Seepage of Coalbed Methane under Solid-Fluid Coupling. Journal of China University of Mining & Technology, 35, 274-278.
[7] Louis, C. (1969) A Study of Ground Water Flow in Jointed Rock and its Influence on the Stability of Rock Masses. 10th Edition, Imperial College of Science and Technology, London.
[8] Biot, M.A. (1941) General Theory of Three-Dimensional Consolidation. Journal of Applied Physics, 12, 155-164. http://dx.doi.org/10.1063/1.1712886
[9] Yin, G.Z., Li, X.Q., Zhao, H.B. and Li, X.S. (2008) Experimental Research on Effect of Geostress on Outburst Coal’s Seepage. Chinese Journal of Rock Mechanics and Engineering, 27, 2557-2561.
[10] Hu, G.Z., Wang, H.T., Fan, X.G. and Yuan, Z.G. (2008) Investigation on Law of Methane Gas Flow in Coal with Coal-Gas Outburst Hazard and Low Permeability. Chinese Journal of Rock Mechanics and Engineering, 28, 2527- 2534.

  
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