WEBMar 1, 2017 · The China national coal mining depth is going deeper and deeper as the average annual rate of 10–50 m [20].The mining depth of many coal mines in MidEast of China has reached 800–1200 m below surface ( 800 m in Huaibei, 850 m in Huainan, and 1000 m in Xuzhou).At these mining depths, the coal seam overburden stress .
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WEBSep 19, 2023 · The gas migration process in the coal seam can be divided into gas desorption and diffusion in the matrix to the fractures and then into the borehole through seepage. ... Zhang J, Liu Y, Ren P, Han H, Zhang S (2021) A fully multifield coupling model of gas extraction and air leakage for inseam borehole. Energy Rep 7:1293–1305
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WEBMay 9, 2018 · Coal seam gas (CSG) is an increasingly important source of natural gas all over the world. Although the influence of conventional oil and gas extraction on surface subsidence has been widely ...
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WEBSep 20, 2019 · Coal Seam Gas: Evaluation, Extraction, and Environmental Issues. September 2019. DOI: /. In book: Sustainable Energy and Environment () Authors: Debadutta Mohanty ...
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WEBDec 21, 2017 · Coal seam gas extraction process (Sajjad et al. 2015). To enlarge fractures and fissures, the compressed liquid, which is a blend of water, sand, and some additives, is driven into the coal seam. The coal seam depressurizes by the process, which permits the trapped gas to become free.
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WEBJan 1, 2023 · A Nonequilibrium model for coal multiphysics. In this section, a nonequilibrium coal multiphysics model is formulated, which includes three governing equations representing mechanical deformation of coal seams, gas flow in the fractures and matrixfracture mass transport, respectively. The new nonequilibrium porosity and permeability .
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WEBThe coal seam gas debate. In this section. Dr Alex St John, Science, Technology, Environment and Resources. Key issue. Coal seam gas (CSG) is a polarising issue in some communities. Proponents argue that CSG is a vital energy resource, necessary for continued gas supply. Opponents claim that CSG could have serious environmental and .
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WEBJun 1, 2021 · 1. Introduction. As the companion of coal seam, coal mine gas (CMG) is a major hazard source to coal mining practice. During the mining process, gas disasters such as gas explosion, gas combustion, and coal and gas outburst may occur, resulting in serious casualties and property losses. 1, 2 Especially when it enters deep mining, .
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WEBDOI: / Corpus ID: ; Study on gas seepage from coal seams in the distance between boreholes for gas extraction article{Zhao2018StudyOG, title={Study on gas seepage from coal seams in the distance between boreholes for gas extraction}, author={Dan Zhao and Jian Liu and Jingtao Pan}, journal={Journal of Loss .
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WEBNov 1, 2022 · The above methods of strengthening coal seam gas extraction introduces one or more gases into the coal seam. The influence of such methods on coal seam gas migration still needs further discussion. ... In summary, other key scientific issues involved in the process of coal mine gas extraction are to reveal the flow state of fluid in the cross ...
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WEBThe appliion of this concept transforms equilibrium permeability models to nonequilibrium ones. Equilibrium models represent only two end points (before gas extraction/injection and after the completion of gas extraction/injection) while our nonequilibrium one represents the complete evolution of coal permeability between two .
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WEBFeb 25, 2021 · Coal bed methane (CBM) is a primary clean energy source found in coal seams. The recovery ratio of CBM is very low, especially with ground extraction, due to the strong adsorption of CH4 on the pores and fissures of coal and low permeability of the coal bed. On the basis of the theory of energy balance, a theory of enhanced CBM (ECBM) .
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WEBAug 16, 2011 · As explained by Dennis Cooke at the Conversation, a major community concern about coal seam gas extraction is the process of fracking. Under this process, vast amounts of highpressure water ...
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WEBMay 21, 2015 · By integrating coal production with gas extraction, coal seam gas becomes a useful resource. Advantage is taken of the effect of strata movement on gas pressurerelief and flow during the coal mining process to establish a single production system for simultaneous coal and gas extraction.
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WEBAlthough numerous studies have tried to explain the mechanism of directional hydraulic fracturing in a coal seam, few of them have been conducted on gas migration stimulated by directional hydraulic fracturing during coal mine methane extraction. In this study, a fully coupled multiscale model to stimulate gas extraction from a coal seam stimulated .
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WEBSep 27, 2021 · DSI is a function of the gas pressure, and its magnitudes are regulated by the Langmuir constants of both the solid grains and the coal bulk. Furthermore, a DSIbased coal permeability model is incorporated into the coupled multiphysics model for coal seam gas production. The model results of both laboratoryscale and fieldscale show .
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WEBApr 19, 2022 · Coal is affected by the concentrated stress disturbance of mining, the disturbance of drilling hole formation, and the concentrated stress of coal shrinkage and splitting of gas desorption from the hole wall; these result in a large number of secondary cracks that collect and leak gas. As a result, it is difficult for the coal seam sealing .
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WEBThe initial phase of CSG production usually involves the extraction of formation water from the coal seams in order to reduce the water pressure and release gas from the coal. At the surface, water in the gas is separated and piped elsewhere for use or further treatment. Gas from underground coal gasifiion (UCG) is sometimes confused with ...
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WEBApr 17, 2019 · 1 INTRODUCTION. China is one of the countries with the largest coalbed methane resources. The exploration and development of CBM resources are of great significance for ensuring the safe production of the coal mine, improving the energy structure and purifying the environment in China. 13 CBM is a kind of unconventional .
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WEBApr 1, 2016 · The gas production from the conventional fields in the Surat Basin steadily increased from an average of 10 BCF/yr in the 1970s to peak at BCF in the 1994/95 fiscal year (Fig. 3).Production from Denison Trough (Bowen Basin) gas fields supplemented Surat production from 1988, supplying industrial users in Gladstone (via .
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WEBMay 9, 2018 · Coal seam gas (CSG) is an increasingly important source of natural gas all over the world. Although the influence of conventional oil and gas extraction on surface subsidence has been widely recognized and studied, few studies are carried out on the surface subsidence in coal seam gas fields and its impact on surface infrastructure and .
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WEBSep 15, 2023 · Liquid CO 2 injection into coal seam for CH 4 displacement is one of the important means to strengthen gas extraction and carbon sequestration in recent years. After liquid CO 2 is injected into coal seam, physical and chemical interactions occur with coal through the process of "liquid phase seepagephase transformation supercharging .
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WEBMay 1, 2016 · Based on the multiphysics field theory, the hydraulicmechanical coupling model of gas extraction in the unloading coal seam was established, and the gas extraction process by drilling borehole in ...
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WEBApr 1, 2013 · 1. Introduction. Reservoir compaction may accentuate the nonDarcy flow and induce the anisotropy of permeability during both conventional gas production and unconventional gas (such as coal seam gas) extraction (Clarkson et al., 2007, Majewska et al., 2010, Zeng et al., 2003).The gas flow in porous media is usually pressuredriven .
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WEBIn industrial chemistry, coal gasifiion is the process of producing syngas—a mixture consisting primarily of carbon monoxide (CO), hydrogen (H 2), carbon dioxide (CO 2), methane (CH 4), and water vapour (H 2 O)—from coal and water, air and/or oxygen.. Historically, coal was gasified to produce coal gas, also known as "town gas".Coal gas .
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