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Articles 2011 - 2040 of 4561
Full-Text Articles in Engineering
Exploration And Development Process Of Coalbed Methane In Eastern Margin Of Ordos Basin And Its Enlightenment, Yang Xiuchun, Xu Fengyin, Wang Hongya, Li Shuguang, Lin Wenji, Wang Wei, Hao Shuai
Exploration And Development Process Of Coalbed Methane In Eastern Margin Of Ordos Basin And Its Enlightenment, Yang Xiuchun, Xu Fengyin, Wang Hongya, Li Shuguang, Lin Wenji, Wang Wei, Hao Shuai
Coal Geology & Exploration
The buried depth of coal seam in the eastern margin of Ordos Basin changes greatly, and the characteristics of coalbed methane reservoir formation and reservoir reconstruction methods vary greatly with different buried depths. At present, coalbed methane exploration gradually extends from a shallow area of 1 000 m to a deeper area of 2 000 m. To study the theory and technology of efficient exploration and development of coalbed methane resources under different burial depths, this paper reviews the exploration and development practices in the eastern margin of Ordos Basin in the past 30 years. According to the changes of …
Review Of The Progress Of Geological Research On Coalbed Methane Co-Production, Guo Chen, Qin Yong, Yi Tongsheng, Ma Dongmin, Wang Shengquan, Shi Qingmin, Bao Yuan, Chen Yue, Qiao Junwei, Lu Lingling
Review Of The Progress Of Geological Research On Coalbed Methane Co-Production, Guo Chen, Qin Yong, Yi Tongsheng, Ma Dongmin, Wang Shengquan, Shi Qingmin, Bao Yuan, Chen Yue, Qiao Junwei, Lu Lingling
Coal Geology & Exploration
Coalbed methane (CBM) co-production is an important way to improve the efficiency of CBM development in multi-seam areas, but the special nature of reservoir formation makes the co-mining method and production effect complex and variable, which presents challenges for efficient development. Experts in the field of CBM from China have carried out a lot of basic research and engineering practice on CBM reservoir formation and the feasibility of co-production in multiple seams, which have gained fruitful results, providing strong support for deepening the CBM geological theory and promoting industrial development. To provide reference for subsequent research, engineering implementation and industrial …
Enrichment Theory Of Large Area And High Abundance Marine Shale Gas And Its Geological Evaluation Technology Progress And Application, Wang Hongyan, Liu Dexun, Yu Yuanjiang, Zhao Qun, Qiu Zhen, Dong Dazhong, Shi Zhensheng, Sun Shasha, Jiang Zhenxue, Liu Honglin, Zhou Shangwen, Bai Wenhua
Enrichment Theory Of Large Area And High Abundance Marine Shale Gas And Its Geological Evaluation Technology Progress And Application, Wang Hongyan, Liu Dexun, Yu Yuanjiang, Zhao Qun, Qiu Zhen, Dong Dazhong, Shi Zhensheng, Sun Shasha, Jiang Zhenxue, Liu Honglin, Zhou Shangwen, Bai Wenhua
Coal Geology & Exploration
The enrichment characteristics and main controlling factors of marine shale gas, geological evaluation and comprehensive area selection of sweet spots are the core content and key to the breakthrough of shale gas exploration and development in Sichuan Basin and its periphery. On the basis of intensive study of geology and geophysical multidisciplinary joint research, field investigation, survey and sampling analysis of key outcrops, core observation and fine description of key exploration wells, this paper presents the enrichment theory and connotation of geological evaluation technology of large area and high abundance shale gas as well as its recent advances, field applications …
Accumulation Model And Exploration And Development Suggestions Of Coal Measure Gas Hydrates In Sanlutian Area Of Muli Coalfield, Qinghai Province, Cao Daiyong, Qin Rongfang, Wang Anmin, Chen Limin, Li Jing, Wei Yingchun
Accumulation Model And Exploration And Development Suggestions Of Coal Measure Gas Hydrates In Sanlutian Area Of Muli Coalfield, Qinghai Province, Cao Daiyong, Qin Rongfang, Wang Anmin, Chen Limin, Li Jing, Wei Yingchun
Coal Geology & Exploration
The Natural Gas Hydrate(NGH) is known as the most promising strategic resource in the 21st century because of its huge energy density, convenient use, high combustion value, and cleanness, and it is an alternative energy source with huge potential for conventional oil and gas resources. The occurrence of the NGH in the Sanlutian area of Muli Coalfield in Qinghai Province is the result of the interaction between the abundant gas sources and the hydrate stability zone in cold highland areas. The NGH in coal-bearing strata is defined as the coal measure gas hydrate, belonging to unconventional coal measure gases. To …
Difference Analysis Of Methane Diffusion Properties Between Tectonic Coal And Primary Coal, Meng Zhaoping, Zhang Kun, Shen Zhen
Difference Analysis Of Methane Diffusion Properties Between Tectonic Coal And Primary Coal, Meng Zhaoping, Zhang Kun, Shen Zhen
Coal Geology & Exploration
Primary coal destroyed by geological stresses will form different types of coal structures, and the accumulation and migration of coalbed methane(CBM) are affected by the changes in pore structures, adsorption/desorption, diffusion and permeability. In this paper, the methane isothermal adsorption experiment, and low-temperature liquid nitrogen and carbon dioxide adsorption experiment were carried out on the samples of primary coal and tectonic coal of No.3 coal seam of Zhaozhuang Coal Mine in Qinshui Basin, so as to analyze the adsorption/desorption properties and pore structure characteristics of primary coal and tectonic coal. The methane diffusion difference and control mechanism of primary coal …
Physical Simulation Of In-Situ Microbial Methanation In Coal Reservoirs With The Participation Of Supercritical Co2, Su Xianbo, Wang Lufei, Zhao Weizhong, Xia Daping, Zhou Yixuan, Wang Qian
Physical Simulation Of In-Situ Microbial Methanation In Coal Reservoirs With The Participation Of Supercritical Co2, Su Xianbo, Wang Lufei, Zhao Weizhong, Xia Daping, Zhou Yixuan, Wang Qian
Coal Geology & Exploration
Supercritical CO2 can destroy the molecular structure of coal and increase the production of biomethane. To investigate the gas production potential under the in-situ conditions of coal reservoirs with the participation of supercritical CO2, the original reservoir pressure, reservoir temperature, and gas composition of the target coal seam in a coalbed methane block in Xinjiang were used as the in-situ reservoir conditions. The self-designed anaerobic fermentation device for coal reservoirs was used to simulate the in-situ anaerobic fermentation process, and the biogas production, coal surface functional groups and microbial community structure under the in-situ conditions were analyzed. …
Molecular Simulation Of The Effect Of Co2/N2 Binary Gas On Methane Adsorption In Coal, Sun Zhixue, Min Cheng, Zhang Wanlu, Jiang Yongping, Yu Xuefeng, Cui Bin
Molecular Simulation Of The Effect Of Co2/N2 Binary Gas On Methane Adsorption In Coal, Sun Zhixue, Min Cheng, Zhang Wanlu, Jiang Yongping, Yu Xuefeng, Cui Bin
Coal Geology & Exploration
The binary gas flooding technology (CO2/N2-ECBM) has become an important means of increasing the production of coalbed methane(CBM). It is of great significance to clarify the CO2/N2 competitive adsorption law in coal seams and its influence on the physical properties of coal seams. The molecular simulation software Materials Studio was used to establish a coal molecular model according to the actual temperature and pressure of the CBM block in Yanchuannan. On the basis of the Grand Canonical Monte Carlo(GCMC) method, the influence of each injection stage in the technology of CO2/N …
Characteristics And Significance Of Proppant In Hydraulic Fractures In Coal Reservoirs, Wang Shengwei, Xiong Zhangkai, Lyu Shuaifeng, Gao Chao
Characteristics And Significance Of Proppant In Hydraulic Fractures In Coal Reservoirs, Wang Shengwei, Xiong Zhangkai, Lyu Shuaifeng, Gao Chao
Coal Geology & Exploration
The distribution form and internal characteristics of proppant after coal seam hydraulic fracturing determine the fracturing effect to a great extent. The proppant in the hydraulic fracture exposed in the underground roadways of the coal mine is taken as the research object. The morphology and accumulation characteristics of the proppant were observed, and the relationship between the morphology and accumulation characteristics of the proppant and its stacking process was analyzed. Then, the morphology and accumulation characteristics of the proppant obtained at the typical part of the hydraulic fracture are described, which provides a basis that restores the stacking process of …
Influencing Factors On Gas Production Effect Of Acid Fractured Cbm Wells In Deep Coal Seam Of Daning-Jixian Block, Li Shuguang, Wang Hongna, Xu Borui, Zhen Huaibin, Wang Chengwang, Yuan Pu
Influencing Factors On Gas Production Effect Of Acid Fractured Cbm Wells In Deep Coal Seam Of Daning-Jixian Block, Li Shuguang, Wang Hongna, Xu Borui, Zhen Huaibin, Wang Chengwang, Yuan Pu
Coal Geology & Exploration
The No.8 deep coal seam in Daning-Jixian Block is large, thick, widely distributed, and rich in coalbed methane(CBM) resources. After volume acid fracturing, a breakthrough has been achieved in the producing test. However, the productivity of the testing wells varies greatly, and the major controlling factors of productivity are not clear, severely restricting the CBM development. In this paper, the testing wells in the No.8 coal seam with a buried depth of more than 2 000 m of the Upper Carboniferous Benxi Formation in Daning-Jixian Block were taken as the research object, and 28 typical evaluation indicators were selected from …
Geological Adaptability Analysis And Operational Parameter Optimization For Staged Fracturing Horizontal Wells In Coal Seam Roof, Jiang Zaibing, Li Haozhe, Xu Yaobo, Zhang Qun, Li Guihong, Fan Yao, Jiang Wenping, Shu Jiansheng, Pang Tao, Cheng Bin
Geological Adaptability Analysis And Operational Parameter Optimization For Staged Fracturing Horizontal Wells In Coal Seam Roof, Jiang Zaibing, Li Haozhe, Xu Yaobo, Zhang Qun, Li Guihong, Fan Yao, Jiang Wenping, Shu Jiansheng, Pang Tao, Cheng Bin
Coal Geology & Exploration
The technique of staged fracturing horizontal wells in coal seam roof is effective for efficient extraction of coalbed methane (CBM) in broken soft and low-permeability coal seams. With the help of the major national science and technology projects of the 13th Five Year Plan for National Economic and Social Development, the efficient extraction technology of CBM by staged fracturing horizontal wells in coal seam roof was studied. By using theoretical analysis and numerical simulation, the fracture propagation patterns in different in-situ stress states were compared, and the influence of the angle between the horizontal well layout orientation and the minimum …
Gas Content And Productivity Controlling Factors Of Coal Reservoir In Sijiazhuang Area, Qinshui Basin, Li Guofu, Zhang Wei, Li Meng, Pan Jienan, Liu Liangliang, Chen Zhaoying, Zhang Yongcheng, Bai Yang
Gas Content And Productivity Controlling Factors Of Coal Reservoir In Sijiazhuang Area, Qinshui Basin, Li Guofu, Zhang Wei, Li Meng, Pan Jienan, Liu Liangliang, Chen Zhaoying, Zhang Yongcheng, Bai Yang
Coal Geology & Exploration
In order to study the characteristics of coalbed methane accumulation and production controlling factors in the northeastern Qinshui Basin, based on the data of coalbed methane drilling and drainage in the Sijiazhuang area, the geological structure, coal seam thickness and buried depth, maceral of the Sijiazhuang coals are analyzed. The geological control mechanism of gas-bearing coal reservoirs is studied, combined with the fracturing and drainage technology of coal-bed methane wells, the production characteristics of coal-bed methane and its influencing factors are discussed. The results show that: (1) The gas-bearing properties of coal reservoirs in the study area are greatly affected …
Production Characteristics Of Deep Coalbed Methane Gas Reservoirs In Daning-Jixian Block And Its Development Technology Countermeasures, Nie Zhihong, Shi Xiaosong, Sun Wei, Yan Xia, Huang Hongxing, Liu Ying, Feng Yanqing
Production Characteristics Of Deep Coalbed Methane Gas Reservoirs In Daning-Jixian Block And Its Development Technology Countermeasures, Nie Zhihong, Shi Xiaosong, Sun Wei, Yan Xia, Huang Hongxing, Liu Ying, Feng Yanqing
Coal Geology & Exploration
The Ordos Basin is rich in deep coalbed methane resources with a depth of more than 2 000 m, which is an important coalbed methane exploration and development area. A number of tests on deep coalbed methane have been carried out in Daning-Jixian Block, and preliminary results have been achieved, but the main technology of scale-efficient development needs to be studied. On the basis of the analysis of experimental data, production data and fracture monitoring data, and by the evaluation of the characteristics, production performance and fracturing effect of deep coalbed methane reservoirs in Daning-Jixian Block, the production characteristics of …
Progress Of Coalbed Methane Exploration And Development In China During The 13th Five-Year Plan Period And The Next Exploration Direction, Ye Jianping, Hou Songyi, Zhang Shouren
Progress Of Coalbed Methane Exploration And Development In China During The 13th Five-Year Plan Period And The Next Exploration Direction, Ye Jianping, Hou Songyi, Zhang Shouren
Coal Geology & Exploration
Based on survey data of coalbed methane exploration and development projects in China, the production status of coalbed methane fields and scientific & technological achievements, this paper analyzes the comprehensive control technical measures for stable and increasing production of coalbed methane fields, and the geological conditions and potential of deep coalbed methane exploration breakthrough. The coalbed methane horizontal well technology and the matching well pattern optimization and drainage technology are also summarized. The results show that the most effective technical measures for the comprehensive control of stable production of coalbed methane fields and low production wells in China are four …
Research Progress Of Multi-Source And Multi-Stage Genesis Of Co2-Enriched Cbm And The Enlightenments For Its Exploration And Development, Tang Shuling, Tang Dazhen, Sun Bin, Tao Shu, Zhang Taiyuan, Pu Yifan, Zhang Aobo, Zhi Yuanhao
Research Progress Of Multi-Source And Multi-Stage Genesis Of Co2-Enriched Cbm And The Enlightenments For Its Exploration And Development, Tang Shuling, Tang Dazhen, Sun Bin, Tao Shu, Zhang Taiyuan, Pu Yifan, Zhang Aobo, Zhi Yuanhao
Coal Geology & Exploration
CO2-enriched coalbed methane(CBM) carries important geological information on CBM genesis and accumulation, and is closely related to the exploration and evaluation of CBM resources. On the basis of the systematic summary of the current research progress of CBM genesis, the current research status of the genetic mechanism of CO2-enriched CBM reservoirs was scientifically analyzed by dissecting the special geological examples of CO2-enriched CBM reservoirs in the southern Junggar Basin, and the problems in the research process of CBM genesis were comprehensively pointed out. The study shows that the generation of CBM has multiple sources …
Theoretical Basis Of Dredging And Efficient Development Of High−Rank Coalbed Methane In China: A Case Study Of The Qinshui Basin, Zhu Qingzhong
Theoretical Basis Of Dredging And Efficient Development Of High−Rank Coalbed Methane In China: A Case Study Of The Qinshui Basin, Zhu Qingzhong
Coal Geology & Exploration
China is rich in high-rank coalbed methane(CBM) resources, which accounts for more than 90% of the total production of CBM in China. The efficient development and utilization of high-rank coal and coalbed methane(CBM) resources is of great practical significance for ensuring national energy strategic security and helping to achieve the strategic goals of “carbon peak and carbon neutrality”. The coalbed methane industry in China is generally characterized by low exploration and development degree, poor adaptability of main technology, low rate of return on investment and small development scale. The large-scale and efficient development of coalbed methane is faced with great …
Influence Of Coal Lithotypes On Adsorption/Desorption Characteristics In Coal Reservoirs And Its Practical Significance: A Case Study In Baode Block, Hou Wei, Xu Fengyin, Zhang Lei, Zhang Wei, Meng Yanjun, Liu Qihu, Li Yongchen, Fan Hongbo, Wang Hongya, Zhang Shuangyuan, Zhang Wen
Influence Of Coal Lithotypes On Adsorption/Desorption Characteristics In Coal Reservoirs And Its Practical Significance: A Case Study In Baode Block, Hou Wei, Xu Fengyin, Zhang Lei, Zhang Wei, Meng Yanjun, Liu Qihu, Li Yongchen, Fan Hongbo, Wang Hongya, Zhang Shuangyuan, Zhang Wen
Coal Geology & Exploration
The difference of coal lithotypes is an important factor affecting the adsorption/desorption characteristics of coalbed methane (CBM) and the productivity of CBM wells. According to four coal samples of different lithotypes from No. 8+9 Coal Seam in Well BX-2, proximate analysis, maceral, wettability and isothermal adsorption/desorption experiments are carried out, and the influence of coal lithotypes on CBM adsorption/desorption characteristics and its mechanism is discussed. The results show that vitrinite content in dull, semi-dark, semi-bright and bright coal samples increases gradually, water and ash content decreases gradually, hydrophilicity decreases gradually, and the Langmuir volume increases gradually. Bright and semi-bright coal …
Characteristics Of Coal Reservoirs And Favorable Areas Classification And Optimization Of Cbm Planning Blocks In Guizhou Province, Xiang Wenxin, Sang Shuxun, Wu Zhangli, Tu Bin, Guo Zhijun, Han Sijie, Zhou Xiaozhi, Zhou Peiming
Characteristics Of Coal Reservoirs And Favorable Areas Classification And Optimization Of Cbm Planning Blocks In Guizhou Province, Xiang Wenxin, Sang Shuxun, Wu Zhangli, Tu Bin, Guo Zhijun, Han Sijie, Zhou Xiaozhi, Zhou Peiming
Coal Geology & Exploration
The scientific evaluation of favorable CBM blocks concerns the deployment of CBM exploration and development and the maximization of benefits. On the basis of the existing geological and engineering data, the geological background, resource characteristics, occurrence characteristics and reservoir characteristics of CBM are studied in the 18 blocks with unregistered mining rights in Guizhou Province. According to the principle of coal rank classification and evaluation, the optimum block among the 18 blocks is selected by using the multi-level fuzzy comprehensive evaluation method. The results are as follows. (1) The coal seams of Longtan Formation in the 18 planning blocks of …
Multi-Scale Prediction Of Coal Seam Fracture Development In Mg Block, Eastern Margin Of Ordos Basin, Zhu Guanghui, Li Zhongcheng, Shi Suzhen, Shi Hao, Lin Liming, Liu Yancheng, Zhang Xin
Multi-Scale Prediction Of Coal Seam Fracture Development In Mg Block, Eastern Margin Of Ordos Basin, Zhu Guanghui, Li Zhongcheng, Shi Suzhen, Shi Hao, Lin Liming, Liu Yancheng, Zhang Xin
Coal Geology & Exploration
Finding out the development characteristics of coal seam fractures is of great significance for coalbed methane exploitation and safe production of underground coal mines. Logging and seismic are effective means of geophysical identification of coal seam fractures. Electrical imaging, resistivity, density, sonic differential time, natural gamma, neutron porosity and array acoustic logs are used to describe the small scale fracture morphology of No.8 and No.9 coal seams of MG block in the eastern margin of Ordos Basin. The middle-scale fracture of No.8 and No.9 coal seams was predicted by prestack Azimuth AVO inversion in OVT domain. And the large-scale fracture …
Skip Nav Destination Research Article| March 16, 2022 Assessing The Effect Of Melt Extraction From Mushy Reservoirs On Compositions Of Granitoids: From A Global Database To A Single Batholith, J. Cornet, O. Bachmann, J. Ganne, A. Fiedrich, C. Huber, C. D. Deering, X. Feng
Skip Nav Destination Research Article| March 16, 2022 Assessing The Effect Of Melt Extraction From Mushy Reservoirs On Compositions Of Granitoids: From A Global Database To A Single Batholith, J. Cornet, O. Bachmann, J. Ganne, A. Fiedrich, C. Huber, C. D. Deering, X. Feng
Michigan Tech Publications, Part 1
Mafic and ultramafic plutonic rocks are often considered to be crystal cumulates (i.e., they are melt-depleted), but such a classification is much more contentious for intermediate to silicic granitoids (e.g., tonalite, granodiorite, granite, and syenite). Whether or not a given plutonic rock has lost melt to feed shallower subvolcanic intrusive bodies or volcanic edifices has key implications for understanding igneous processes occurring within the crust throughout the evolution of the Earth. We use statistical analyses of a global volcanic and plutonic rock database to show that most mafic to felsic plutonic rock compositions can be interpreted as melt-depleted (i.e., most …
Electro‐Driven Materials And Processes For Lithium Recovery—A Review, Anna Siekierka, Marek Bryjak, Amir Razmjou, Wojciech Kujawski, Aleksandar N. Nikoloski, Ludovic F. Dumée
Electro‐Driven Materials And Processes For Lithium Recovery—A Review, Anna Siekierka, Marek Bryjak, Amir Razmjou, Wojciech Kujawski, Aleksandar N. Nikoloski, Ludovic F. Dumée
Research outputs 2022 to 2026
The mass production of lithium‐ion batteries and lithium‐rich e‐products that are required for electric vehicles, energy storage devices, and cloud‐connected electronics is driving an unprecedented demand for lithium resources. Current lithium production technologies, in which extraction and purification are typically achieved by hydrometallurgical routes, possess strong environmental impact but are also energy‐intensive and require extensive operational capabilities. The emergence of selective membrane materials and associated electro‐processes offers an avenue to reduce these energy and cost penalties and create more sustainable lithium production approaches. In this review, lithium recovery technologies are discussed considering the origin of the lithium, which can be …
Water Inrush Warning System Of Deep Limestone In Panxie Mining Area Based On Multi-Source Data Mining, Bi Bo, Chen Yongchun, Xie Hao, An Shikai, Xu Yanfei
Water Inrush Warning System Of Deep Limestone In Panxie Mining Area Based On Multi-Source Data Mining, Bi Bo, Chen Yongchun, Xie Hao, An Shikai, Xu Yanfei
Coal Geology & Exploration
Under the long-term water-rock interaction, the hydrochemical composition of deep limestone water in each aquifer is different. Such factors as crustal movement and mining influence have led to the hydraulic connection between aquifers. Major water inrush accidents often occur when the deep high-pressure limestone water bursts into the mine with the shallow limestone water as a channel. On the basis of water level data of 182 surface hydrological observation holes in nine coal mines in Panxie Mining Area of Huainan Coalfield from 2015 to 2018, and the temporal and spatial law of water level change of each hydrological observation hole …
Characteristics Of Roof Water Inflow And Control Technology For High Intensity Mining In Dongsheng Mining Area，Shenfu Coalfield, Xu Feng, Jin Dewu, Yang Maolin, Wang Shidong, Huang Huan, Dang Yakun
Characteristics Of Roof Water Inflow And Control Technology For High Intensity Mining In Dongsheng Mining Area，Shenfu Coalfield, Xu Feng, Jin Dewu, Yang Maolin, Wang Shidong, Huang Huan, Dang Yakun
Coal Geology & Exploration
In view of the threat of roof water disasters in coal mining in western China, the water inflow data of 50 working faces are counted in Dongsheng Mining Area of Shenfu Coalfield, and five typical water inflow characteristics are summarized, which are dynamic recharge-led sustained growth type, the increasing first and then stabilizing type with “dynamic-static” reserves acting together, continuous stability of micro inflow, differential hydrogeological conditions locally prominent type, and the increasing first and then decreasing type dominated by static reserves. According to the law of each type of water inrush, the corresponding ideas and measures of water disaster …
Comprehensive Correlation Technology Of Coal And Rock Layers In Mines For Intelligent Mining, Wang Haijun, Liu Shande, Ma Liang, Zhu Yuying, Shu Jiansheng, Wang Xiangye
Comprehensive Correlation Technology Of Coal And Rock Layers In Mines For Intelligent Mining, Wang Haijun, Liu Shande, Ma Liang, Zhu Yuying, Shu Jiansheng, Wang Xiangye
Coal Geology & Exploration
The coal-rock correlation runs through the whole process of the coal geological exploration and the mine production stage. In view of the difficult problems of the coal-rock correlation in the mine production stage, such as short distance, multi-coal seams and complex structure, taking Huoshaopu Coal Mine in Panxian Coalfield of Guizhou Province as the research object, through the analysis of the geological exploration data, combined with the surface gas investigation boreholes, the underground geological survey, the gas parameter test, the marker layer suitable for the mine production stage was extracted from the coal-rock correlation marker layers established during the geological …
Application Of Advanced Regional Treatment Technology Of Hard Roof In Buertai Coal Mine Of Shendong Coal Group, Yang Junzhe, Wang Zhenrong, Lyu Qingxu, Yang Sen, Li Guo, Zheng Kaige
Application Of Advanced Regional Treatment Technology Of Hard Roof In Buertai Coal Mine Of Shendong Coal Group, Yang Junzhe, Wang Zhenrong, Lyu Qingxu, Yang Sen, Li Guo, Zheng Kaige
Coal Geology & Exploration
The hard roof is a difficult problem in rock stratum control. The breaking and instability of high hard rock strata often induces strong coal pressure disasters, seriously threatening the safety production in coal mines. Hard roof control is one of the major problems in coal mine safety production. In response to the problems of large thickness, high hardness of the coal seam roof and its difficulty in collapse in Buertai Coal Mine in Shendong Mining Area, the hydraulic fracturing mechanism and technical advantages of directional long borehole segmented hydraulic fracturing are analyzed. The location of boreholes is determined based on …
Evaluation Of Coalbed Methane Extraction Effect Based On 3d Geological Modeling Technology: An Example Of Sihe Mine In Jincheng City, Jiang Zaibing, Yang Jianchao, Li Yong, Pang Tao
Evaluation Of Coalbed Methane Extraction Effect Based On 3d Geological Modeling Technology: An Example Of Sihe Mine In Jincheng City, Jiang Zaibing, Yang Jianchao, Li Yong, Pang Tao
Coal Geology & Exploration
Three-dimensional geological modeling can intuitively and visually evaluate the effect of coalbed methane(CBM) dynamic drainage, and provide guidance for subsequent adjustments to development plans. With the help of 3D geological modeling software, No.3 Coal Seam of west-second panel is taken as the research object. A geological model that can reflect the spatial geometric changes and structural characteristics of coal seams, and the dynamic changes of coal reservoir attribute parameters is established based on the analysis of geological and productivity data and numerical simulation, to realize the dynamic evaluation of the CBM extraction effect in the study area. The constructed three-dimensional …
Table Of Contents, The Editors
Geochemical Characteristics And Significance Of Water Produced By Coalbed Methane Wells In Lu’An Mining Area, Hua Mingguo, Tian Lin, Zhang Yan, Li Jia, Cao Yongheng
Geochemical Characteristics And Significance Of Water Produced By Coalbed Methane Wells In Lu’An Mining Area, Hua Mingguo, Tian Lin, Zhang Yan, Li Jia, Cao Yongheng
Coal Geology & Exploration
Hydro-geochemistry analysis is an important method for CBM exploration and development research. In this paper, the distribution characteristics of salinity, H/O stable isotope and ion concentration in sample water was investigated, and the optimal CBM development area was analyzed by the characteristics of regional structural distribution and the CBM development history. The testing water was from the No.3 CBM well of the Shanxi Formation Permian system in the Lu’an Mining area in the south-central part of Qinshui Basin. The results show that there are three high salinity areas in the mining area, with an average groundwater salinity of 2 000-3200 …
Mechanical Properties And Acoustic Emission Characteristics Of Sandstone Under Natural And Saturated Conditions, Zhang Yin, Li Zhe, Song Shikang, Zhao Yi, Li Hao
Mechanical Properties And Acoustic Emission Characteristics Of Sandstone Under Natural And Saturated Conditions, Zhang Yin, Li Zhe, Song Shikang, Zhao Yi, Li Hao
Coal Geology & Exploration
In order to study the mechanical properties and acoustic emission (AE) characteristics of sandstone with different grain sizes in the process of damage and failure under saturated and natural conditions, we carried out uniaxial compression tests and AE tests on three kinds of sandstone under saturated and natural conditions to study the mechanical properties and AE characteristics under the uniaxial stress state. The test results show that the average compressive strength of coarse-grained sandstone, medium-grained sandstone, and fine-grained sandstone are 54.23 MPa, 53.56 MPa, 59.46 MPa respectively under natural conditions, and 35.62 MPa, 31.79 MPa and 29.10 MPa under saturated …
The Reflected Radio Wave Method For Detecting Coal Seam Faults In Mining Face, Gu Huanqi, Wu Rongxin, Shen Guoqing, Hu Ze
The Reflected Radio Wave Method For Detecting Coal Seam Faults In Mining Face, Gu Huanqi, Wu Rongxin, Shen Guoqing, Hu Ze
Coal Geology & Exploration
Mine radio wave exploration can be used for coal seam geological structure exploration. With its advantages of portability and good effect, it has become a conventional and necessary means for coal seam geological structure exploration. At present, the energy attenuation of radio wave signal in coal seam is fast, and the transmission radio wave detection of working face is restricted in large width coal seam. On this basis, the radio wave reflection exploration method of coal seam working face is proposed. Firstly, the electric model of two-dimensional coal measure strata is constructed by numerical simulation to analyze the field strength …
Down-Hole Ø550 Mm Super Large Diameter Coal Seam Borehole Drilling Technology And Equipment And Its Engineering Application, Sun Yongxin
Coal Geology & Exploration
For the prpose of improving the gas control efficiency and reduce the cost in the goaf of “U” ventilation face, the ø550 mm super-large diameter borehole was used to replace the cross-heading buried pipe for gas drainage in goaf. According to the characteristics of super-large diameter borehole and the technical problems existed in construction, a ZDY15000LP super-large diameter spiral drilling rig with maximum torque 15000 N·m, maximum penetration 700 kN, and maximum stroke 1.3 m has been developed, which adopted the two-body layout of main engine and pump station, and the innovative design of key parts such as main engine, …