Mechanism of Water-fracturing-induced Permeability Increment of &ldquo;Three-Soft&rdquo; Coal Seam and Construction Parameters Determination

WANG Zhi-rong,HAN Zhong-yang,LI Shu-kai,HU Xiang-zhi

doi:10.11764/j.issn.1672-1926.2014.05.739

2014 , Vol. 25 >Issue 5: 739 - 746

DOI: https://doi.org/10.11764/j.issn.1672-1926.2014.05.739

Mechanism of Water-fracturing-induced Permeability Increment of “Three-Soft” Coal Seam and Construction Parameters Determination

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1.School of Water Conservancy and Environment Engineering,Zhengzhou University,Zhengzhou 450001,China;
2.Gas Well Engineering Research Center of Henan,Zhengzhou 450001,China

Received date: 2013-08-30

Revised date: 2013-11-04

Online published: 2014-05-10

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Abstract

In view of the low permeability and difficult extraction of gas in “three soft” coal seam in western Henan,China,this paper studied the deformation characteristics of gas generation and storage layers in Ⅲ coal seam.Based on ABAQUS platform and Gaocheng coal mine,a three-dimensional nonlinear fluid-solid coupling hydraulic fracturing model was established.Then,the rheology-damage-seepage coupling behavior of target layer was described by multi-parameter coupling simulation method,and the initiation and propagation of crack was simulated by cohesive element of T-P damage evolution criterion.In addition,the response mechanism of rock mass against dynamic load and the fracturing effect under dynamic condition were discussed.The results show that when the injection pressure is 4.5MPa,and injection time in about 2 hours,the influence radius of hydraulic fracturing in bedding coal seam can basically reach an ideal data of 80-100m and it greatly improves the low permeability of “three soft” coal seam.Practice also proves that correct construction method and optimal combination of technical parameters can effectively improve the permeability and gas extraction of coal seam,which has important significance to comprehensive utilization of gas in complex mining area.

Key words： Three soft; coal seam; Hydraulic fracturing; Fluid-solid coupling; Gas extraction

Cite this article

WANG Zhi-rong,HAN Zhong-yang,LI Shu-kai,HU Xiang-zhi . Mechanism of Water-fracturing-induced Permeability Increment of “Three-Soft” Coal Seam and Construction Parameters Determination[J]. Natural Gas Geoscience, 2014 , 25(5) : 739 -746 . DOI: 10.11764/j.issn.1672-1926.2014.05.739

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