NDLI: Mechanism of the Two-Phase Flow Model for Water and Gas Based on Adsorption and Desorption in Fractured Coal and Rock

Content Provider	Springer Nature Link
Author	Chen, Shikuo Yang, Tianhong Ranjith, P. G. Wei, Chenhui
Copyright Year	2016
Abstract	Coalbed methane (CBM) is an important high-efficiency, clean-energy raw material with immense potential for application; however, its occurrence in low-permeability reservoirs limits its application. Hydraulic fracturing has been used in low-permeability CBM exploration and as a new technique for preventing gas hazards in coal mines. Fractures are the main pathways of fluid accumulation and migration, and they exert some control over the stability of rock mass. However, the differences in progression between the original fractures of the coal mass and the new discrete fractures caused by hydraulic fracturing remain unclear, and the unsaturated seepage flows require further study. Therefore, a cross-scale hydraulic fractured rock mass numerical model was developed by using the 3D fractured extrusion coupling variables reconstruction technique. This paper uses fracture surface parameters combined with the fractal dimension and multi-medium theory to provide a high-precision characterization and interpretation of the fracture mechanics. The mechanism of the permeability evolution of fractured coal and rock under stress-releasing mining combined with water injection was studied by considering gas adsorption and desorption as well as the coupling characteristic of seepage-stress in fractured rock masses. Aperture, contact area ratio, and stress in permeability and fracture development have a strong influence on the permeability and seepage path, which in turn control the effective radius by absolute water injection. All of these factors should be considered when studying the structural characteristics of rock masses.
Starting Page	571
Ending Page	586
Page Count	16
File Format	PDF
ISSN	07232632
Journal	Rock Mechanics and Rock Engineering
Volume Number	50
Issue Number	3
e-ISSN	1434453X
Language	English
Publisher	Springer Vienna
Publisher Date	2016-11-15
Publisher Place	Vienna
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Fractured coal and rock Multi-scale Water injection Fracture flow Gas adsorption and desorption Geophysics/Geodesy Civil Engineering
Content Type	Text
Resource Type	Article
Subject	Geology Geotechnical Engineering and Engineering Geology Civil and Structural Engineering

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