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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In the process of coal seam gas extraction, a large number of extraction boreholes are arranged in the coal seam. When there are more extraction boreholes arranged along the strike and dip of the coal seam, the values of m and n are larger. The number of inquadrangle borehole layouts will mainly depend on 2 mn items. Compared with the ...
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Section snippets Theory. Borehole gas predrainage is the most common way in the extraction process of gas resources [26]. However, the stress concentration phenomenon around the borehole readily leads to localized damage to the borehole wall and the formation of many crushed coal masses and broken coal, which are the main channels for gas flow around the borehole.
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The gas flow equation of Eq. (33) and the deformation equation of Eq. (7) together describe the interactions among the deformation of coal, free gas flow and gas absorption/desorption in the cleat system and the matrix of coal seam. Fig. 1 graphically presents the fully coupling processes of this developed model in the coal seam gas production. . Mechanical deformation will compact the pore ...
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Coal Seam Gas Extraction by Integrated Drillings and Punchings from the Floor Roadway considering HydraulicMechanical Coupling Effect Geofluids / 2022 / Article Special Issue NonAqueous Fracturing for Unconventional Oil, Gas, and Geothermal Reservoirs View this Special Issue Research Article | Open Access
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Coalbed methane (CBM), is also known as coalbed gas and coal seam gas/methane (CSG/CSM), which are terms referring to the unconventional natural gas resource stored in coal beds and are expected to be an important energy resource of global significance in the future (Rightmire 1984; Rice 1993; Flores 1998, 2013; Palmer 2010; Yang and Liu 2021). ...
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water. This releases natural gas from the coal. The gas and water are separated and the gas is piped to compression plants for transportation via gas transmission pipelines. In some cases hydraulic fracturing, or 'fracking', is used to extract coal seam gas. Hydraulic fracturing is the process of injecting fluid under high pressure into a coal
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During the stable gas production stage, the highest AMCCF value was %, and the PZCF was less than mm. It hardly produced coal fines during the gas production decay stage, and the PZCF was generally less than 1 μm. (4) The control of faults on coal fines production weakened as the distance from a fault increased.
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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 the environment. This paper discusses modelling of the ...
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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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1. Introduction. The efficient extraction of gas ensures the safe production of coal mines. It also contributes to clean energy and reduces methane emissions in the process of coal mining. 1,2 In fact, it can be used as a carbon emission reduction approach for coal enterprises and a positive response to the goal of "carbon peaking and carbon neutrality".
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Low permeability of a reservoir directly makes gas extraction in deep coal seams more difficult. However, under the strong disturbance of mining, substantial gas emissions from coal seam may cause gas overrun in the working face and even bring gas explosion accidents.
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Coal is a black or brownishblack sedimentary rock that can be burned for fuel and used to generate is composed mostly of carbon and hydrocarbons, which contain energy that can be released through combustion (burning). Coal is the largest source of energy for generating electricity in the world, and the most abundant fossil fuel in the United States.
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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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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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As the coal mining depth increases, the coal seam gas pressure and gas content increase, mining conditions become more complicated, and the coal seam permeability decreases. ... hydraulic method is to use the hydraulic shocking impact to form a network of fractures. 20 A schematic diagram of the CH 4 extraction process by fracturing is shown in ...
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The China national coal mining depth is going deeper and deeper as the average annual rate of 1050 m [20].The mining depth of many coal mines in MidEast of China has reached 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 ranges from 22 to 33 MPa and the coal seam gas pressure and gas content ...
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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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Coal mine gas accidents have been one of the most serious disasters in the process of coal mining in China that seriously affect the safety of mine production and the life safety of miners. (1−5) At present, the fundamental method to prevent coal seam gas disasters is to increase the permeability of coal seam.
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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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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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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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Coal seam gas overall process The development of unconventional gas resources such as shale gas and coal seam gas has boomed over the past few years [1]. Coal seam gas (CSG) also known as coal bed methane (CBM) is comprised of natural gas that is extracted from low to high rank coal beds [2], [3].
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To produce coal seam gas (CSG), wells are drilled into underground coal seams, bringing water (CSG water) from the seams to the surface. This process reduces pressure in the seams which allows CSG to be released. The quality of CSG water quality varies greatly, however it is generally rich in salts and other minerals.
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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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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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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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