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The gas migration provides a "material basis" for the gas extraction from the fractured zone of the goaf. The pressure-relief gas from the layer adjacent to the coal seam, as well as the residual gas from the mining process, flow through fracture channels and accumulate in the goaf, creating an area of gas enrichment.
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Bai, T. ; Chen, Z. ; Aminossadati, S.M. et al. / Impact of flow regimes on coal fines generation during coal seam gas production process. 50th U.S. Rock Mechanics/Geomechanics Symposium. American Rock Mechanics Association (ARMA), 2016. pp. 356-365 (50th US Rock Mechanics / Geomechanics Symposium 2016).
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Coal seam gas (CSG) is a natural gas, consisting primarily of methane, which collects in underground coal seams by bonding to the surface of coal particles. Conventional oil and gas Environmental regulations for conventional oil and gas non-mining activities.
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protective coal seam and gas was pre-drained from each coal seam. After the protective coal seam was mined, coal mining was carried out at 24,208 work-ing face. GAS FLOW CHARACTERISTICS IN PROTECTIVE COAL SEAM MINING Distribution Laws of Stress and Permeability in Coal Seams Among many factors, permeability of coal and
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The 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 …
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The gas content and methane concentration in the 15# coal seam are higher than those in the 3# coal seam. The relationship between gas content within a coal seam and burial depth depends on ...
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In fact, gas migration of seepage and diffusion in a real coal seam is a parallel and series coexistence process; however, the process can be simplified as a …
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Coal seam gas pressure is an important index to evaluate the risk of coal outbursts. The accuracy of measurement is closely related to the quality of hole sealing, and reasonable grouting pressure is one of …
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Coal Seam Characterization: The process of evaluating and describing the properties and characteristics of coal seams, including thickness, rank, gas content, and …
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Two models of two-phase flow for the development of single coal seam layer and multicoal seam layers were developed, respectively, to simulate the fluid flow …
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1. Introduction. The natural occurrence of methane gas in coal seams, commonly referred to as Coal Seam Gas (CSG), possesses substantial global resources estimated at 39 trillion cubic meters (Tcm), accounting for approximately 14% of the technically recoverable unconventional gas reserves (McGlade et al., 2013).Therefore, …
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depths. The results show that the main controlling factor of gas content in a coal seam is the burial depth of the coal seam, and the gas content tends to increase with the increasing depth. A geological structure has an effect on the occurrence of coal seam gas in a local area, and the gas content in the coal seam near a fault is 1.6 times that
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PDF | On Jun 26, 2016, Tianhang Bai and others published Impact of flow regimes on coal fines generation during Coal Seam Gas production process | Find, read and cite all the research you need on ...
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Another future use would be so-called "power to gas" [5] where electricity is used to split water into oxygen and hydrogen, the latter being stored and at a later point in time converted back to ...
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Coal Seam Degasification. Pramod Thakur, in Coal Bed Methane, 2014. 8.1.2 Reservoir Properties of Coal Seams. Coal seam degasification techniques to be used in a mine depend on the reservoir properties of the coal seams being mined. Good methane control planning depends on accurate information on the reservoir properties of the coal seam …
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The pressure within the coal seam is relieved prior to the pressure within the coal seam decreasing to some stabilized pressure by permitting the injected gas and other fluids to flow out from the wellbore at a rate essentially equivalent to the maximum rate permitted by the wellbore and surface wellbore flow control equipment.
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CSG is natural gas that is found in coal deposits. CSG is extracted through wells drilled into coal seams. The production involves the initial extraction of water from the coal seams to reduce the pressure and release the gas from the coal. The water in the gas is separated when the CSG is brought to the surface. The water extracted from
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This causes gas to desorb from the coal matrix at the matrix/cleat interfaces, creating a methane concentration gradient across the coal matrix. Gas diffuses through the matrix and is released into the cleat system. When the gas saturation exceeds a critical value in the cleats, gas will flow to the wellbore.
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DOI: 10.1016/J.IJRMMS.2021.104769 Corpus ID: 234816378; Modeling coupled gas flow and geomechanics process in stimulated coal seam by hydraulic flushing @article{Liu2021ModelingCG, title={Modeling coupled gas flow and geomechanics process in stimulated coal seam by hydraulic flushing}, author={Ting Liu and Baiquan …
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The effects of directional compaction, non-Darcy flow and anisotropic swelling on the extraction of natural gas in coal seam reservoirs are important but not well understood so far.
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Many different completion techniques, such as vertical-well multiseam completions and multiple lateral wellbores drilled into a single coal seam, have been used to develop coalbed methane (CBM) …
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Coal-and-gas outburst (CGO) is a major challenge to safe and efficient coal mining worldwide. As the primary energy source of CGO, coal seam gas determines the impact dynamic characteristics of the coal–gas two-phase flow. Therefore, the process of gas pressure evolution obtained from an experiment was used as the initial condition to …
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Coal fines are generated during both the dewatering and Coal Seam Gas (CSG) production stages. ... the flow regimes during CSG production process can be summarised in Fig. 1. One of the most important operational difficulties for CSG wells relates to production of coal fines, which reduces gas productivity and presents a …
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1 AUSTRALIAN NATIONAL GREENHOUSE ACCOUNTS Coal Seam Gas: Estimation and Reporting of Greenhouse Gas Emissions This fact sheet provides an overview of issues around the estimation and reporting of greenhouse gas emissions from coal seam gas projects in Australia and recent international developments. Coal seam gas
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The transport mechanism for the gas desorption and diffusion in a coal seam is illustrated in Figure 1. Once the gas pressure outside a coal seam is decreased due to production, the...
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The moisture content of low-rank coal is one of the most critical properties in coal-fired power plant operation (Luo, Zhang, and Chen 2017; Phiciato and Yaskuri 2019; Yu et al. 2013). A large ...
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Download scientific diagram | Schematic diagrams ((a) gas extraction in coal seam; (b) the process of gas extraction; (c) DDZ and NDZ). from publication: Dual-Zone Gas Flow Characteristics for Gas ...
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1 INTRODUCTION. Gas disaster is one of the important factors threatening the safety production of coal mines. 1-3 As the main energy source of China, ensuring efficient coal mining is an important …
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In order to improve the gas drainage efficiency of low permeability coal seams, based on the theoretical analysis of liquid CO2's phase change permeability improvement, negative temperature damage ...
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