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 .
WEBOct 26, 2023 · 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 .
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 .
WEBJun 6, 2022 · The coal output of a single cave is approximately t/m, and the pressure relief effect is obvious. When the measurement range is 50 m, the average gas concentration for the mechanical cavitation drilling is 50%. The net amount of gas drainage is m 3 /min. The net volume of single cycle drainage is 60,480 m 3.
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 ...
WEBFeb 26, 2022 · The highest gas pressure and the maximum gas content in the coal seam were MPa and m 3 /t, respectively. There was a high coal and gas outburst hazard in the coal seam and, therefore, it was necessary to improve the elaborate identifiion and realtime monitoring on the outbursthazardous zones in the coal seam.
WEBSep 2, 2014 · This animation provides an overview of the coal seam gas extraction process, from drilling the well to what happens to the extracted gas and water. Also expl...
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 .
WEBOct 1, 2019 · 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 ...
WEBLiquefied natural gas (LNG) is a natural gas that has been cooled to minus 162°C, a process that is commonly done for gas export purposes as it reduces the volume of the transported gas. ... Conventional gas Coal seam gas; Cumulative production Reserves (2P) Resources (2C) Cumulative production Reserves (2P) Resources (2C) Adavale: 9: .
WEBJun 21, 2023 · Coal Seam Gas. Coal Seam Gas (CSG) is a naturally occurring methane gas found in most coal seams and is similar to conventional natural gas. In Australia the commercial production of CSG commenced in 1996 in the Bowen Basin, Queensland. Since then production has increased rapidly, particularly during the first decade of the .
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)
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.
WEBMay 15, 2024 · As the initial coal seam temperature during the gas extraction process increases, the disparity between the coal seam temperature and the initial temperature becomes more pronounced, as illustrated in Figure 21. This is because as the initial coal seam temperature rises, the desorption amount of gas at the same extraction time also .
WEBMethane is the major component of gas in coal, comprising 80%–95% of the total gas content. The balance is made up of ethane, propane, butane, carbon dioxide, hydrogen, oxygen, and argon. All coal seams begin to oxidize when exposed to ventilation air in a mine and produce some carbon monoxide and hydrogen sulfide.
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 ...
WEBCoalbed methane extraction. Coalbed methane extraction (CBM extraction) is a method for extracting methane from a coal deposit. Coal bed methane (CBM) is one of the factors restricting the safe production of coal in underground coal mines. It is also a form of highquality energy that can be used in many fields such as power generation, heating ...
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 .
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.
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. In this paper, based on the analysis of coal pore and fissure characteristics, and in view of the current situation of gas drainage and .
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 ...
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 .
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
WEBMay 1, 2016 · Coal seam gas (CSG) is a growing industry in Queensland and represents a potential major employer and deliverer of financial prosperity for years to come. CSG is a natural gas composed primarily of methane and is found trapped underground in coal beds. During the gas extraction process, significant volumes of associated water are also .
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 .
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, .
WEBFeb 12, 2021 · The surface extraction methods of gas (coalbed methane) in coal mine areas of China are mainly predraining under original conditions and extraction under mining pressure relief (Xu and Qian 2000; Karacan 2007, 2009; Karacan and Goodman 2009; Yuan 2016).The latter is more timeeffective for solving the problems of coal mine .
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 .
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 29, 2023 · In order to increase the permeability of low permeability and high gas coal seam and improve the efficiency and utilization of gas extraction, the permeability enhancement technology of deep hole presplitting blasting is proposed, and the mechanism of blasting induced cracking of deep hole presplitting blasting is analyzed. .
WEBApr 1, 2022 · Gas extraction and transport process in coal seam (a) gas flow field (b) mesh generation. Fig. 3 (b) shows the mesh division and the node numbering of the solution area. The mesh nodes in the x axis direction past the point (0, N ) belong to the fracture flow field, and the intersection of x axis and r axis horizontal along vertical mesh ...
WEBNov 24, 2023 · The coal seam gas transport process is nonisothermal,, there is heat exchange during gas desorption, desorption, and seepage [25 ... with the progress of gas extraction, the gas pressure in the coal seam decreases, the effective stress in the coal seam increases, and the coal skeleton compresses while the coal matrix shrinks, .
WEBApr 1, 2023 · Zhangcun coal mine is loed at the northeast of Changzhi City in Shanxi Province, China. The 3# coal seam is characterized by thickness of ∼6 m, high gas content of m 3 /t, and low permeability of × 10 −17 m shown in Fig. 3 (a), gas extraction is adopted to deplete gas from coal seam, and the inseam boreholes with .
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