Thermos-Solid-Gas Coupling Dynamic Model and Numerical Simulation of Coal Containing Gas

Xiao, Fukun; Meng, Xin; Li, Lianchong; Liu, Jianfeng; Gang, Liu; Liu, Zhijun; Xu, Lei

doi:10.1155/2020/8837425

Cited by 5 publications

(4 citation statements)

References 5 publications

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“…Before the explosion stress wave reaches the measuring point unit, the measuring point unit is subjected to the same pressure as that in the x -axis direction, so it shows tensile stress in the x -direction stress diagram. After the explosion stress wave reaches the measuring point unit, the gas pressure and explosion stress wave act together to rapidly increase the stress of the measuring point unit and increase the peak stress when there is no gas pressure [ 22 ].…”

Section: Results and Analysismentioning

confidence: 99%

Blasting Law of Liquid CO2 Phase Change in Coal Mine Based on Numerical Simulation

Fang

2022

International Journal of Analytical Chemistry

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In order to obtain the best CO2 blasting drilling efficiency and improve the gas permeability coefficient of the coal seam in the mining area, a research method of liquid CO2 phase change blasting in the coal seam based on electrochemical numerical simulation is proposed. In this paper, the electrochemical numerical simulation of coalbed methane caused by liquid CO2 phase change blasting is studied through theoretical analysis, the antireflection mechanism of liquid carbon dioxide gas explosion on broken coal seam is obtained, and the initial fracture length of coal body caused by gas explosion stress wave is deduced by the mathematical model. A method for improving CBM desorption with nonmechanical coal was proposed, namely, a method for electrochemically strengthening CBM desorption. A comprehensive theory and application system of liquid carbon dioxide phase change gas explosion and anti-reflection technology are established by combining theoretical analysis, experimental research, and numerical simulation with field industrial comparative experiment. According to the gas tracing method, the precise measurement of the working face shows that the impact radius of the collision caused by the explosion of the liquid carbon dioxide phase change gas is 2 m. Gas emissions increased the emissions of coal seam drilling in the affected areas by 4 to 8 times, and the gas emission attenuation coefficient decreased from 0.76 times to 0.93 times. The carbon dioxide phase change gas cracking theory and antireflection theory and their application technology system are systematically studied. The research shows that the liquid carbon dioxide phase transfer gas blasting and infiltration technology is not limited by the geological conditions of the coal seam and has the characteristics of high efficiency and inherent climate. In view of the wide area of coal mines and the harsh geological conditions of coal seams, carbon dioxide phase change gas-induced cracking antireflection technology has application prospects and expandability.

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Section: Results and Analysismentioning

confidence: 99%

Blasting Law of Liquid CO2 Phase Change in Coal Mine Based on Numerical Simulation

Fang

2022

International Journal of Analytical Chemistry

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“…In this simulation, a uniformity coefficient is used to evaluate the physical property uniformity in coal and rock materials. The actual mechanical properties of coal and rock materials are connected to uniformity, and these values are used to input the micromechanical parameter values for the numerical simulation [45][46][47]. The Weibull distribution is used to assign properties to the coal and rock materials, while the damage constitutive relationship is based on the Mohr-Coulomb criterion [48,49].…”

Section: Test Results Of Coal Seam Hydraulicmentioning

confidence: 99%

Research on Hydraulic Fracturing Technology of Long Boreholes along Strata of High Vast Thick Coal Seam

Wang,

Li,

Liu

et al. 2024

Advances in Civil Engineering

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Gas extraction is a major technique for regional gas regulation and coal and gas comining in China. Assuring effective gas extraction operations is a crucial step in ensuring the supply of energy. The effect range of extraction drilling, pressure relief degree, and standard period of gas extraction are all constrained because of the geological constraints affecting coal gas permeability and occurrence. Combined with the advantages of directional drilling and high-efficiency pumping technology and antireflection enhanced pumping technology of hydraulic fracturing, directional long-drilling hydraulic fracturing can effectively improve the efficiency of gas control and expand the scale of gas control. The present study focuses on the exploration of directional long-hole hydraulic fracturing technique in thick coal seams with high gas content using Dafosi Mine as a case study. The research findings demonstrate that hydraulic fracturing contributes to the enlargement of pore size, pore density, and pore connectivity in coal seams. In-depth research was conducted on the expansion of coal seam fractures during the hydraulic fracturing process using the RFPA3D-flow numerical simulation program. Additionally, a comprehensive analysis of stress distribution around the fractures under the flow-solid coupling condition was performed. To further improve the effectiveness of hydraulic fracturing technique, the research team optimized the fracturing tools and construction processes in the four coal seams of Dafosi Mine. The impact of segmented hydraulic fracturing in coal seam bare hole drilling was also studied. Furthermore, an investigation method specific to the coal seam bare hole segmented hydraulic fracturing effects applicable to Dafosi Mine was developed. The maximum fracture extension pressure, minimum fracture closure pressure, and fracture morphology change characteristics during drilling and fracturing were measured, and the fracturing influence radius of coal seam was determined to be 46−58 m, the gas extraction concentration after fracturing increased by 2.20–4.22 times, and the 100-m extraction flow increased by 4.93–11.03 times. It gives other mines technical assistance so they can keep advocating and utilizing the horizontal directional long-drilling stage hydraulic fracturing technique.

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“…Based on gas migration in the coal seam, the following assumptions are proposed: − (1) the pores and fractures within the coal are saturated with gas, and adsorption and desorption of gas occur instantaneously, satisfying the Langmuir equation. (2) Coal is an isotropic and linear elastic material composed of a double-pore medium.…”

Section: Mathematical Modelmentioning

confidence: 99%

Spatiotemporal Relationship for Well-Type Selection and Layout Optimization of Surface Wells Based on the REV Permeability Model

Wang,

Lu,

Chen

et al. 2023

ACS Omega

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Thermos-Solid-Gas Coupling Dynamic Model and Numerical Simulation of Coal Containing Gas

Cited by 5 publications

References 5 publications

Blasting Law of Liquid CO2 Phase Change in Coal Mine Based on Numerical Simulation

Blasting Law of Liquid CO2 Phase Change in Coal Mine Based on Numerical Simulation

Research on Hydraulic Fracturing Technology of Long Boreholes along Strata of High Vast Thick Coal Seam

Spatiotemporal Relationship for Well-Type Selection and Layout Optimization of Surface Wells Based on the REV Permeability Model

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