5. Conclusion. (1) An improved coupled modeling method for coalbed methane extraction after hydraulic fracturing is proposed. It mainly includes two parts: hydraulic fracturing modeling and coupling modeling for coalbed methane extraction. In the first part, we introduce a state damage variable based on damage mechanics theory to record the ...
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1. Introduction Coalbed methane (CBM) is an important associated resource, which is generated during the coal formation process and stored within the coal seam. Since coal has gradually entered the deep mining stage, its geology has become more complex, and its properties of low permeability are becoming more prominent.
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Water contamination is a significant concern when it comes to coal seam gas extraction. The process involves injecting large volumes of water, mixed with chemicals, into the ground to release the gas. This can potentially contaminate underground water sources, leading to environmental and health risks for nearby communities. ...
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In fact, 20 times the amount of energy you would do from a similar coal seam gas extraction process. MARK HORSTMAN: ... View the clip 'Coal seam gas production' for more information.
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Coal seam gas, also known as coalbed methane (CBM), is a natural gas that is often found trapped within coal deposits deep below the Earth's surface. The process of extracting CSG involves drilling into the coal seams and capturing the gas for commercial use.
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Gas extraction is the main method to reduce gas content and eliminate gas accidents, and due to the influence of mining stress in the coal seam mining process, there are elastic damage zones and plastic damage zones of coal seams [3, 7]. Therefore, in order to improve the efficiency of gas extraction, it is necessary to study the elastic ...
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In order to develop precise hole placement technology for gas extraction, this paper combines industrial testing, the evolution law of coal rock damage permeability, and the coal doublepore doublepermeability model; establishes a coupling model of the coal damage deformation field and matrixfracture double diffusion seepage field; and determines precise hole placement spacing for a coal ...
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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 process to meet engineering quality sealing ...
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Gas preextraction technology in a coal reservoir can not only reduce greenhouse gas (GHG) emissions but also effectively recover coalbed methane (CBM). In this work, we use a geomechanicalcoupled gas flow (GCF) model to simulate and analyze the preextraction effect of a miningdisturbed coal seam. First, the simulation results of the GCF model are compared with field test data to verify the ...
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1 Introduction. Recovery of coalbed methane (CBM) from coal seams can not only benefit mining safety, reduce greenhouse gas emissions, and also increase clean energy supply (Karacan et al., 2011; Moore, 2012).In the Junggar Basin, the CBM resources have been estimated at trillion cubic meters, which is the third largest CBM basin in China after the Qinshui Basin and Ordos Basin (Fu et al ...
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Exploring the evolution characteristics of gas seepage between boreholes during the drainage process is critical for the borehole's layout and highefficiency gas drainage. Based on the dualporous medium assumption and considering the effect of stress redistribution on coal seam gas seepage characteristics, a coal seam gas seepage model with a threedimensional roadway and borehole crossing ...
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In order to reveal the process and mechanism of gas flow in a lowpermeability coal seam, a new multiplerelaxationtime lattice Boltzmann method (MRTLBM) model of gas migration in coal micro/nanopores based on Langmuir monolayer adsorption theory, the slip boundary scheme and Bosanquet effective viscosity was established. The software MATLAB was used to carry out the simulation study of ...
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Enhanced coal bed methane recovery using gas injection can provide increased methane extraction depending on the characteristics of the coal and the gas that is used. Accurate prediction of the extent of gas adsorption by coal are therefore important. Both experimental methods and modeling have been used to assess gas adsorption and its effects, including volumetric and gravimetric techniques ...
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How gas extraction can unearth cleaner energy sources Monash Lens While fracking is highly controversial, the lessons from pursuing coal seam gas are already helping us understand and improve on a form of renewable energy also found deep underground geothermal energy. Read more at Monash Lens.
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In order to solve the problem that the gas in the upper corner is easy to exceed the limit in the mining process of the deep outburst coal seam. Based on the theory of "Oring" and the distribution of stratigraphy in the field, the development law of mining fissures in the overlying rock layer during the workface retrieval was studied by combining theoretical calculation and ...
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One potential source of energy is extraction of unconventional gases, such as basincentered gas, tight gas, coal seam gas (CSG) and shale gas [1]. The extraction of natural gas from low permeability unconventional reservoirs requires methods to improve access to the reservoir. 'Hydraulic fracturing' is one such technique which has made gas ...
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In this paper, using the continuumdiscontinuum element method (CDEM), the fragmentation and outburst process of coal specimen are simulated, and the main factors affecting coal breaking and outburst are explored. The results show that after the coal seam is uncovered, coal generates obvious failure and outburst trend. Near coalfree surface, the fracture coal blocks generate significant ...
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Coal seam predrainage technology is widely used to prevent and control gas in China's highgas coal seams, and upward drilling is a safe and reliable technology. Using the Luling Coal Mine as the study location, according to the actual situation of the site, a layerthrough drilling process was proposed. Relying on a crosslayer extraction borehole, coal seam water injection efficiency ...
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The insitu gasification process (ISG) produces methane, hydrogen and other valuable components. The synthetic gas (syngas) can be used to produce electricity directly or further refined into a variety of products including synthetic methane and ammonia. The ISG demonstration project was built to inform the design for a potential commercial ...
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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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Environmental impact of coal mining and coal seam gas production on surface water quality in the Sydney basin, Australia. Environ Monit Assess. 2017 Aug;189(8):408. doi: /s . It also contributes to greenhouse gas emissions, both through the direct release of methane during extraction and the burning of the gas for energy.
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Integrated coal production and gas extraction must be considered as a system which involves the exploration and measurement of stress field redistribution, deformation and failure of coal and rock, gas pressure and permeability, and gas desorption and migration during the process of coal mining. Fundamental theory
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The widely spread CarboniferousPermian coal seam group in southern China has great potential for coalbed methane resources, but the extensively developed tectonically deformed coal seriously restricts its development. Taking the Dahebian block in western Guizhou as the study area, the geological model of coalbed methane reservoirs in the tectonically deformed coal seam group was established ...
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This study used computer simulation to select appropriate process designs to make coal seam gas (CSG) associated water comply with beneficial reuse regulations. ... 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 ...
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This hole collapse leads to a failure to seal the hole and effectively extract the C 4, C 3, and C 2 coal seam gas from the upper part of the C 7+8 coal seam, making it difficult to ensure that the C 2 coal seam gas extraction process meets the required standard. Based on this, the crosslayer hole expansion and permeability enhancement ...
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Within the USA, both coal seam gas (8% of total natural gas produced) and shale gas industries (30% of total) are in substantial growth phases. Although A. Gore, D and Davies, P (2013) Department of Environment and Geography, Macquarie University, Background paper on produced water and solids in relation to coal seam gas production: Report
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In the process of coal mine gas extraction, it is necessary to ensure the effective gas extraction in all directions in the mine so as to prevent and control the gas disaster. ... Xiaocun C, Hui T (2018) Technical scheme and application of pressurerelief gas extraction in multicoal seam mining region. Int J Min Sci Technol 28(3):483489 ...
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For the gas extraction process, the larger the plastic zone created by the coal body around the borehole, the wider the range of fissures created and the greater the permeability, the more conducive to gas extraction and the increase in extraction rate. ... "Numerical Simulation of Gas Extraction in Coal Seam Strengthened by Static Blasting ...
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Groundwater impacts the removal of groundwater during the gas extraction process may lead to water bores, located in the same aquifer, being impacted (see Gas Guide Chapter 6) ... During the process of producing coal seam gas (CSG), groundwater is extracted in order to reduce water pressure in the coal seams to allow methane gas to be ...
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The selection of proppants is critical in the coal seam gas extraction process, where the softer coal rock surface restricts the use of high strength proppants due to its vulnerability of embedding into the surface. 2) coal properties elastic modulus of coal is the most important factor deciding the proppant behaviour in the extraction ...
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Coal seam gas extraction is not only a source of clean and natural energy but also a means to address the pressing issue of gas control . Undoubtedly, methane, a crucial element of coal mine gas, is a potent greenhouse gas [ 8 ].
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A material supplier from Belgium would like to produce limestone powder for his custome...
India is rich in various mineral resources and it is an important mineral processing market
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