Effect of temperature on gas seepage characteristic based on coal-gas interaction model

The temperature has a significant impact on the coal seam gas extraction. A fully coupled model is established in this study, which takes into account the coal-gas interaction characteristic. The numerical result shows that the coalbed CH4 migratio and transport evolution coal bed CH4 reservoir is not only dependent on the coal matrix deformation, gas pressure and gas adsorption, but also closely related to temperature.

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A fully coupled thermo-hydro-mechanical model associated with inertia and slip effects

Thermal Science ◽

10.2298/tsci17s1259x ◽

2017 ◽

Vol 21 (suppl. 1) ◽

pp. 259-266 ◽

Cited By ~ 1

Author(s):

Yi Xue ◽

Zheng-Zheng Cao ◽

Cheng-Zheng Cai ◽

Fa-Ning Dang ◽

Peng Hou ◽

...

Keyword(s):

Coal Seam ◽

Mechanical Model ◽

Coalbed Methane ◽

Gas Flow ◽

Gas Adsorption ◽

Coal Bed ◽

Klinkenberg Effect ◽

Numerical Result ◽

Slip Effects ◽

Fully Coupled

The inertia and slip effects have a significant impact on the coal seam gas extraction. A fully coupled thermo-hydro-mechanical model is established in this study, which takes into account the influence of non-Darcy gas flow and Klinkenberg effect on the coal seam deformation and coalbed methane migration. The numerical result shows that the coalbed methane migration and transport evolution coal bed methane reservoir is not only dependent on the coal matrix deformation, gas pressure and gas adsorption, but also closely related to inertia effect and slip effect.

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Effect of damage on gas seepage mechanism in coal seam based on a coupled model

Thermal Science ◽

10.2298/tsci180319129x ◽

2019 ◽

Vol 23 (3 Part A) ◽

pp. 1323-1328

Author(s):

Yi Xue ◽

Zhengzheng Cao ◽

Faning Dang ◽

Songhe Wang ◽

Mingming He ◽

...

Keyword(s):

Coal Seam ◽

Gas Adsorption ◽

Damage Model ◽

Mechanical Damage ◽

Coupled Model ◽

Gas Migration ◽

Initial Stage ◽

Coal Deformation ◽

Gas Seepage ◽

Coal Damage

Damage has a significant impact on gas migration in coal seam. In this paper, a coupled hydraulic-mechanical-damage model is established, which takes into account the coupling relationship among coal damage, gas seepage and coal deformation. The simulation results show that the damage of coal body has little effect on seepage characteristic in the initial stage, but the influence of damage on gas seepage is increasing with the increase of time. Both the distribution of gas pressure and the gas adsorption content of coal body have a significant change.

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Study on an Analytical Solution of Gas Seepage Equation Considering the Adsorption Effect

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.744-746.1654 ◽

2015 ◽

Vol 744-746 ◽

pp. 1654-1661

Author(s):

Zhi Gang Zhang

Keyword(s):

Analytical Solution ◽

Numerical Solutions ◽

Gas Adsorption ◽

Development Planning ◽

Practical Significance ◽

Coal Bed ◽

Adsorption Effect ◽

Gas Seepage ◽

Standard Solution ◽

Adsorption Quantity

The functional relationship between rock and coal permeability and gas adsorption quantity has been determined, based on earlier experimental results. Then, by method of mathematical physics, the authors derived an analytical solution for a gas seepage equation in which the adsorption effect has been considered. This analytical solution could be used for developing the theory of Seepage Mechanics and Computational Fluid Dynamics, and for checking and correcting various numerical solutions as a standard solution, and for inspiring various calculating techniques such as difference schemes, grid generation, and others as well. The analytical solution derived in this paper has extremely important practical significance in conducting the arrangement of gas extraction operation in coal mine and the CBM (coal bed methane) development planning.

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