Dynamic diffusion-based multifield coupling model for gas drainage

Liu, Ting; Lin, Baiquan; Yang, Wei; Liu, Tong; Kong, Jie; Huang, Zhanbo; Wang, Rui; Zhao, Yang

doi:10.1016/j.jngse.2017.04.026

Cited by 96 publications

(54 citation statements)

References 48 publications

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“…where E is the Young's modulus (Pa); v is the Poisson's ratio; β is the thermal expansion coefficient (K −1 ); V m is the molar constant of gas; R is the universal gas constant (J/mol•k); δ ij is the Kronecker function; a i is the Langmuir volume constant (m 3 /kg); b i is the Langmuir pressure constant (Pa −1 ); P i is the gas pressure(MPa); ρ c is the density of coal (kg/m 3 ); and T is the temperature of the coal (K). The strain and displacement components satisfy the Cauchy equation [28,37]:…”

Section: Stress-strain Equationmentioning

confidence: 99%

Numerical Simulation of the Effect of Injected CO2 Temperature and Pressure on CO2-Enhanced Coalbed Methane

et al. 2020

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The injection of CO2 to displace CH4 in coal seams is an effective method to exploit coalbed methane (CBM), for which the CO2 injection temperature and pressure are important influential factors. We performed simulations, using COMSOL Multiphysics to determine the effect of CO2 injection temperature and pressure on CO2-enhanced coalbed methane (CO2-ECBM) recovery, according to adsorption/desorption, seepage, and diffusion of binary gas (CO2 and CH4) in the coal seam, and deriver a thermal–hydraulic–mechanical coupling equation of CO2-ECBM. The simulation results show that, as CO2 injection pressure in CO2-ECBM increases, the molar concentration and displacement time of CH4 in the coal seam significantly decrease. With increasing injection temperature, the binary gas adsorption capacity in the coal seam decreases, and CO2 reserves and CH4 production decrease. High temperatures are therefore not conducive for CH4 production.

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Section: Stress-strain Equationmentioning

confidence: 99%

Numerical Simulation of the Effect of Injected CO2 Temperature and Pressure on CO2-Enhanced Coalbed Methane

et al. 2020

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“…model required more known parameter values such as fracture pressure and pore pressure, which are difficult because of the complexity of coal seam geological conditions. Therefore, verifying the correctness of the model is relatively difficult [21]. Zhang et al regarded coal seam as a combination of fracture and matrix systems.…”

Section: State Of the Artmentioning

confidence: 99%

“…The y direction is regarded as the vertical direction. By incorporating Hooke's law, the geometric equation for coal rock deformation, and the correctional effective stress equation into the above equations, the differential equations for the deformation field in which displacement is variable can be obtained as follows [21,32]:…”

Section: Control Equations For the Coal Rock Deformationmentioning

confidence: 99%

Numerical Analysis and Prediction of Coal Mine Methane Drainage Based on Gas–Solid Coupling Model

Tang

Zheng

et al. 2019

Teh. vjesn.

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Methane drainage using boreholes is one of the most effective means of preventing coal mine methane disasters. However, the distributions of stress and permeability around the borehole and the effective influence radius of methane drainage are not clearly known. To solve this problem, a mathematical model of gas-solid coupling of coal rock was first established in this study based on the Kozeny-Carman equation. In this model, the coal rock was considered as a fracture-porosity dual medium. Methane's flow was seepage in the fracture system and diffused in the pore system. Second, the finite volume method was used to discretize the coupling model. The Newton-Raphson iteration and generalized minimal residual algorithm method were used to solve the nonlinear coupling equation after diffusion. Finally, Fortran language was used to simulate the process of methane drainage using a borehole. Results showed that there was respectively stress concentration on the left and right sides of the borehole. This area was associated with the lower permeability in these zones and destroyed the borehole, which is the one of the main reasons for the low efficiency of methane drainage. The relationship between the effective influence radius and the drainage time could be described by a power function. The effective influence radius of the borehole, cumulative methane drainage volume, and residual methane content distribution obtained by simulation were well consistent with the data obtained by the actual measurements, which proves the credibility of the gas-solid coupling and solving methods. This study provides some theoretical reference for methane drainage and the solution of multi-physics field coupling model in coal mines.

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“…Coal and gas outbursts during underground coal mining are characterized by the sudden ejection of large masses of coals or volumes of gases . Such outbursts may result in significant damage to equipment (Figure A) and may also result in injury and fatalities . Since the first‐recorded outburst happened in the Isaac coal mine in Lule coal field in 1843, more than 40 000 outbursts have been reported worldwide .…”

Section: Introductionmentioning

confidence: 99%

“…[1][2][3][4] Such outbursts may result in significant damage to equipment ( Figure 1A) and may also result in injury and fatalities. [5][6][7][8] Since the first-recorded outburst happened in the Isaac coal mine in Lule coal field in 1843, more than 40 000 outbursts have been reported worldwide. 9 The most disastrous mine outbursts resulted in 187 deaths in the Nowa Ruda Colliery (Poland) in 1941, 148 deaths in the Daping coal mine (China) in 2004, and 214 deaths in the Sunjiawan coal mine (China) in 2005.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation on dynamic strength and energy dissipation characteristics of gas outburst‐prone coal

Fan

Elsworth

et al. 2019

Energy Science & Engineering

111

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We report laboratory experiments to investigate the dynamic failure characteristics of outburst‐prone coal using a split Hopkinson pressure bar (SHPB). For comparison, two groups of experiments are completed on contrasting coals—the first outburst‐prone and the second outburst‐resistant. The dynamic mechanical properties, failure processes, and energy dissipation of both outburst‐prone and outburst‐resistant coals are comparatively analyzed according to the obtained dynamic compressive and tensile stress‐strain curves. Results show that the dynamic stress‐strain response of both outburst‐prone and outburst‐resistant coal specimens comprises stages of compression, linear elastic deformation, then microfracture evolution, followed by unstable fracture propagation culminating in rapid unloading. The mechanical properties of both outburst‐prone and outburst‐resistant coal specimens exhibit similar features: The uniaxial compressive strength and indirect tensile strength increase linearly with the applied strain rate, and the peak strain increases nonlinearly with the strain rate, whereas the elastic modulus does not exhibit any clear strain rate dependency. Differences in the dynamic failure characteristics between outburst‐prone and outburst‐resistant coals also exist. The hardening effect of strain rate on outburst‐prone coal is more apparent than on outburst‐resistant coal, which is reflected in the dynamic increase factor at the same strain rate. However, the dynamic strength of outburst‐prone coals is still lower than that of outburst‐resistant coals due to its low quasi‐static strength. The dissipated energy of outburst‐prone coal is smaller than that of outburst‐resistant coal. Therefore, the outburst‐prone coal, characterized by low strength, high deformability, and small energy dissipation when dynamically loaded to failure, is more favorably disposed to the triggering and propagation of gas outbursts.

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Dynamic diffusion-based multifield coupling model for gas drainage

Cited by 96 publications

References 48 publications

Numerical Simulation of the Effect of Injected CO2 Temperature and Pressure on CO2-Enhanced Coalbed Methane

Numerical Simulation of the Effect of Injected CO2 Temperature and Pressure on CO2-Enhanced Coalbed Methane

Numerical Analysis and Prediction of Coal Mine Methane Drainage Based on Gas–Solid Coupling Model

Experimental investigation on dynamic strength and energy dissipation characteristics of gas outburst‐prone coal

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