WEBNov 3, 2023 · The indirect method is to predict the gas content of coal seam by gas emission and adsorption isotherm curve 14,15,16. Permeability is a key factor to determine the development process and ...
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) .
WEBMar 4, 2024 · In the process of protected seam mining, the reduction in stress and the enhancement of the gas mobility that affects the protected seam are crucial manifestations of the protection effect. Taking the working face of E832010 and the upper D56 coal seam of the Six Mines of Ping Coal Company Limited as the study object, the research .
WEBBai, T, Chen, Z, Aminossadati, SM, Danesh, NN, Pan, Z, Liu, J Li, L 2016, Impact of flow regimes on coal fines generation during coal seam gas production process. in 50th Rock Mechanics/Geomechanics Symposium. 50th US Rock Mechanics / Geomechanics Symposium 2016, vol. 1, American Rock Mechanics Association (ARMA), pp. 356365, .
WEBJun 14, 2023 · The FLAC 3D numerical simulation software simulated the gas extraction process from the coal seam using directional boreholes. Optimal drilling parameters were determined by analyzing plasticity, stress, and enhanced permeability zone distribution patterns during gas extraction with different borehole radii. A .
WEBDec 15, 2021 · 1. Introduction. According to the Global Energy Statistical Yearbook 2020, the total proven reserves of natural gas worldwide amount to trillion m total production is billion m 3, and the total consumption is 3, billion m 3 with a share of % in primary energy [1].Coal seam gas (CSG) accounts for 6%–9% of .
WEBSep 20, 2019 · Coal Seam Gas: Evaluation, Extraction, and Environmental Issues. September 2019. DOI: /. In book: Sustainable Energy and Environment () Authors: Debadutta Mohanty ...
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 .
WEBMay 26, 2023 · Coal as the main energy source in the process of industrialization is necessary to ensure rapid economic development (Balat et al. 2010; Wang et al. 2020; Xiang et al. 2021).However, the coal bed conditions are complex in China (, high gas content) potential causing ous safety problems in the process of coal mining, especially .
WEBMay 10, 2024 · During the gas extraction drilling process, especially the soft coal seam drilling process, due to the constraints of geological conditions, technical conditions, and other factors, it is easy to encounter stuck holes, blowout, lost circulation, and hole collapse, which affect the realization of efficient gas management. In the petroleum industry, .
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 .
WEBJun 30, 2013 · The major steps for this drilling and completion technique are. Drilling the production hole to the top of the coal seam. Running and cementing casing. Drilling a hole through the coal seam. Increasing the diameter of the hole by a technique known as underreaming (Fig. 1)
WEBApr 1, 2022 · Section snippets Basic assumptions. Coal seams generally contain both coal matrix and fractures, which are typical of dualporosity media [52]. To simplify the methane gas flow process in coal as much as possible, we refer to previous literature [12], [51] when building the dualporosity model of coal bodies and make the following .
WEBOct 1, 2020 · Typically, the gas reserves are loed in coal seams which are several hundred meters below ground. The extraction process involves depressurization of the seams [3], which results in the collection of substantial amounts of CSG associated water which is saline in character [4].
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 ...
WEBDownload scientific diagram | Coal seam gas production process (created by the author using data from Rice and Nuccio 2000) from publiion: A study on the carbon dioxide injection into coal seam ...
WEBMay 1, 2021 · This process of parameter estimation in the absence of direct calibration is called regionalisation. ... In particular, these pathways include the effects of groundwater extraction – which is common to coal seam gas extraction and to both surface and underground mining – and of the controlled collapse of underground voids.
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 ...
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 .
WEBFeb 1, 2024 · Characteristics of plugging methods for horizontal inseam gas extraction boreholes in coal seams can be seen in Table 1. Table 1. ... Determination of sealing depth of inseam boreholes for seam gas drainage based on drilling process of a drifter. Eng. Geol., 210 (2016), pp. 115123. View PDF View article View in Scopus Google Scholar.
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 .
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 .
WEBJul 7, 2023 · Gas disasters have become one of the factors seriously affecting mine safety production. 2,3 Gas pressure is an important indior for preventing gas disasters, which directly reflects the gas content in coal seams and the potential danger level of coal and gas outbursts. 4−6 However, accurate measurement of coal seam gas pressure is very ...
WEBNov 6, 2014 · Enhanced coal bed methane recovery (ECBM) is the process in which a displacing gas, such as CO 2 (CO 2ECBM) or N 2 (N 2ECBM) is introduced into the coal seam through an injection well and held there for a sufficient period to enable a substantial amount of methane to be desorbed from the surfaces of the coal seam. Following the .
WEBOct 27, 2023 · The gas extraction quantity is affected by gas pressure, permeability, and coal seam buried depth in the actual process of gas extraction, which is variable and complex. There is an interaction influence between each factor, which provides us with valuable guidance for analyzing the coupling change law of gas extraction quantity.
WEBJun 7, 2022 · new technology of largediameter mechanical cavemaking to promote gas extraction. in a coal seam. This technology mainly uses the pressure of a water injection pump. to control the automatic ...
WEBSep 1, 2015 · Despite long extraction times, the amount of extracted gas is very low due to low gas permeability in Chinese coal seams. Therefore, the coal seam requires significant structural changes to improve the efficiency of the gasextraction process and reduce the gasextraction time (Zhou et al., 2012).
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 ...
WEBRealizing efficient gas drainage in low permeability coal seams has always been a difficult problem for coal miners. Based on this, this paper proposes a new technology of largediameter mechanical cavemaking to promote gas extraction in a coal seam. This technology mainly uses the pressure of a water injection pump to control the automatic .
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 .
WEBApr 19, 2022 · As a result, it is difficult for the coal seam sealing process to meet engineering quality sealing requirements, which results in problems such as low gas concentration during the extraction process.
WEBJan 13, 2023 · The method of predicting whether it is an outburst danger zone stipulated in the "Coal and Gas Outburst Prevention Rules" is based on the coal seam gas pressure of MPa and the content of 8 m 3 / t as the critical value. Reducing the gas pressure of coal seam to MPa during the extraction process is an important discriminant index.
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