Research on controlling mechanism of fracture propagation of multi-stage hydraulicfracturing horizontal well in roof of broken soft and low permeability coal seam
Received date: 2017-07-01
Revised date: 2017-09-28
Online published: 2018-02-10
Coalbed methane drainage of broken soft and low permeability coal seam from ground surface has always been a technical bottleneck that prevents CBM industrialization and coal mine gas disaster prevention and control work for a long time.It is also a worldwide technical problem.Based on the establishment of coalbed methane mode of multi-stage hydraulic fracturing horizontal well in roof strata of broken soft and low permeability coal seam，applying numerical simulation method，the mechanism of fracture propagation of multi-stage hydraulic fracturing and horizontal wells in roof strata of broken soft and low permeability coal seam was studied.It is revealed that the hydraulic fractures not only can grow from the high stress value of roof strata towards and throughout lower stress value of broken soft and low permeability coal seam，and also the length of fractures formed in underlying broken soft and low permeability coal seam is longer than that of directly fractured in broken soft and low permeability coal seam due to fractures propagation in the direction of length in relatively friable roof strata producing tear effect on broken soft and low permeability coal seam at the same time of fractures propagation of the mode of multi-stage hydraulic fracturing horizontal well in roof strata of broken soft and low permeability coal seam.Fracturing effect of multi-stage hydraulic fracturing horizontal well in roof strata of broken soft and low permeability coal seam was verified in field.The distribution of broken soft and low permeability coal seams in Late Paleozoic in China is widely distributed，which are mostly high gas outburst coal mine.The research results of this paper can be used for the CBM drainage in this kind of coal seam，in particular，which can be used as a reference and guidance for the rapid coal gas pre-pumping in the heading of coal seam strip of outburst coal seams，regional gas outburst control and gas disaster prevention.The drainage model has a good prospect of application.
Wu Xiu-ping，Zhang Qun . Research on controlling mechanism of fracture propagation of multi-stage hydraulicfracturing horizontal well in roof of broken soft and low permeability coal seam[J]. Natural Gas Geoscience, 2018 , 29(2) : 268 -276 . DOI: 10.11764/j.issn.1672-1926.2017.11.019
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