Numerical Simulation of Fracture Extending in Coal Seam under Hydraulic Fracturing Engineering Based on Fractal Theory
Received date: 2015-01-20
Revised date: 2015-05-08
Online published: 2015-10-10
According to the fractal characteristics of porosity of porous media and fracture extending in the hydraulic strengthening process,the fractal theoretical relationship between porosity and permeability in the coal seam is established.Further,the fractal calculation models of the fracture toughness and the filtration coefficient of fracturing fluid under the hydraulic fracturing are also built.Based on all of these studies above,the fracture extending model is set up under the assumed condition of pseudo-three-dimensional fracture extending model.The geometric parameters of fracture for the eight CBM wells in Zhengzhuang block of Qinshui coal basin,Shanxi province,are calculated by means of the fractal models.The results show that the fractures′ lengths of hydraulic fracture vary from 106.8m to 273.1m,and the widths range from 3.6m to 12.7m in the study block.Through comparing the calculation results with different models,it shows the results of the fractal model fit well with the field measured value,which reflects the applicability of the model at some extent.
ZHANG Xiao-dong,ZHANG Shuo,YANG Yan-lei,ZHANG Peng,WEI Gao-yang . Numerical Simulation of Fracture Extending in Coal Seam under Hydraulic Fracturing Engineering Based on Fractal Theory[J]. Natural Gas Geoscience, 2015 , 26(10) : 1992 -1998 . DOI: 10.11764/j.issn.1672-1926.2015.10.1992
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