Detection Performance Of The Azimuthal Electromagnetic Wave Logging Instrument At Coal-Rock Interface In Horizontal Wells,
2022
China Coal Research Institute, Beijing 100013, China; Xi’an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi’an 710077, China
Detection Performance Of The Azimuthal Electromagnetic Wave Logging Instrument At Coal-Rock Interface In Horizontal Wells, Zhang Yi, Kang Zhengming, Feng Hong, Han Xue, Li Fei, Li Xin
Coal Geology & Exploration
The advance and accurate identification of coal-rock interfaces is one of the key technologies to realize intelligent mining, improve mining efficiency and reduce cost. Azimuthal electromagnetic wave logging has achieved good results in lithologic interface identification of petroleum logging, but the identification of coal-rock interface is seldom studied. For the purpose of studying the applicability and detection performance of azimuthal electromagnetic wave in the coalfield logging environment, the one-dimensional generalized reflection coefficient method is used to calculate the magnetic field component, and the fast Hankel transform is used to accelerate the integral calculation speed. What is more, the effects of …
Development Of A Methane Concentration Monitoring Sensor In Underground Boreholes Of Coal Mines,
2022
Xi’an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi’an 710077, China
Development Of A Methane Concentration Monitoring Sensor In Underground Boreholes Of Coal Mines, Cong Lin
Coal Geology & Exploration
At present, during underground drilling operations in coal mines, the methane concentration monitoring system can only reflect the total drainage volume of methane at the borehole, and cannot observe the effect of methane drainage of a certain section of the borehole. With the increase of the borehole depth for underground methane drainage, the effect of methane drainage changes greatly along the length of the borehole. There is a big difference in the effective extraction radius at different hole depths, leading to greater difficulty in arranging the boreholes for methane extraction, and increased uncertainty. In response to this problem, a methane …
Development And Test Analysis Of Borehole In-Situ Rock Mass Shear Measurement System,
2022
China Coal Research Institute, Beijing 100013, China; Xi’an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi’an 710077, China
Development And Test Analysis Of Borehole In-Situ Rock Mass Shear Measurement System, Zhang Youzhen, Liu Yanjie, Zhong Zicheng
Coal Geology & Exploration
The pre-drilled rock shear measurement system can measure the internal friction angle and cohesion of in-situ rock in mines. Compared with the traditional laboratory test and field tests, such method can keep the essential state of rock mass to the maximum extent, and obtain the test data conveniently and quickly. Firstly, the overall design idea of the system was elaborated, and the pre-drilled in-situ rock shear equipment was successfully developed and the data acquisition and storage software platform was built. Secondly, the test data processing method was developed, based on the working principle of the shearing instrument, and the specific …
Effects Of Different Tempering Temperatures On The Microstructure And Mechanical Properties Of A Low-Carbon High-Strength Steel,
2022
Xi’an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi’an 710077, China
Effects Of Different Tempering Temperatures On The Microstructure And Mechanical Properties Of A Low-Carbon High-Strength Steel, Lu Tian, Wen Guodong, Ma Xiaolin, Li Jun, Ju Pei, Wang Shiqing
Coal Geology & Exploration
The mechanical properties of low carbon high strength steel materials used in drilling equipment can be improved effectively by adjusting tempering temperatures of different heat treatments to obtain different material composition. The heat treatment and tempering temperatures were set at 610℃, 630℃ and 650 ℃ respectively, and the microstructure of this low-carbon high-strength steel was compared and analyzed by metallographic microscope and Scanning Electron Microscope(SEM). After tempering, the microhardness, tensile properties and impact energy of the structure were measured respectively by the microhardness tester, universal material testing machine and impact testing machine. The research results show that the performance of …
Water Inrush Warning System Of Deep Limestone In Panxie Mining Area Based On Multi-Source Data Mining,
2022
National Engineering Research Center for Coal Mine Gas Control, Huainan 232001, China; Ping’an Coal Mining Engineering Technology Research Institute Co., Ltd., Huainan 232001, China
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,
2022
China Coal Research Institute, Beijing 100013, China; Xi’an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi’an 710077, China; Shaanxi Key Laboratory of Prevention and Control Technology for Coal Mine Water Hazard, Xi’an 710077, China
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,
2022
Xi’an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi’an 710077, China
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,
2022
China Energy Shendong Coal Group Co., Ltd., Yulin 719315, China
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,
2022
Xi’an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi’an 710077, China
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,
2022
China Coal Technology and Engineering Group (CCTEG)
Geochemical Characteristics And Significance Of Water Produced By Coalbed Methane Wells In Lu’An Mining Area,
2022
Lu’an Chemical Group Co., Ltd., Changzhi 046200, China
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,
2022
School of Mechanics and Engineering, Liaoning Technical University, Fuxin 123000, China
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,
2022
School of Earth and Environment, Anhui University of Science and Technology, Huainan 232001, China
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,
2022
Shanxi Tiandi Wangpo Coal Industry Co., Ltd., Jincheng 048021, China
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, …
Acoustic Emission Characteristics And Fracture Response Behavior Of Hard Rock-Like Material Under Influence Of Loading Rate,
2022
School of Civil Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China
Acoustic Emission Characteristics And Fracture Response Behavior Of Hard Rock-Like Material Under Influence Of Loading Rate, Zhang Zekun, Song Zhanping, Cheng Yun, Huo Runke, Song Wanxue, Wang Kuisheng, Wang Tong, Yang Tengtian, Liu Wei
Coal Geology & Exploration
For the purpose of clarifying the correlation between Acoustic Emission(AE) and rupture response characteristics and loading rate in the failure and instability of hard rocks, uniaxial compression tests and acoustic emission tests were conducted on hard rock-like material samples at different loading rates to analyze the characteristics of mechanical parameters, AE phenomena and rupture response characteristics of hard rock-like material, and to obtain the early warning information of the rock failure based on the information on AE parameters. The results show that the peak strength, elastic modulus and peak strain of hard rock-like material have the loading rate effect. The …
Accident Analysis Of Mining Industry In The United States – A Retrospective Study For 36 Years,
2022
Department of Mineral Engineering, New Mexico Institute of Mining and Technology, Socorro, NM, USA and John and Willie Leone Family Department of Energy and Mineral Engineering, University Park, The Pennsylvania State University, State College, PA, USA
Accident Analysis Of Mining Industry In The United States – A Retrospective Study For 36 Years, Elham Rahimi, Younes Shekarian, Naser Shekarian, Pedram Roghanchi
Journal of Sustainable Mining
A retrospective study on accident analysis of the United States mines for 36 years was achieved using statistical analysis on the MSHA's accident databases between 1983 and 2018. A regression model of generalized estimation equation (GEE) was used for unbalanced panel data that provided 95,812 observations for 19,924 mine-ID-year in aggregate, coal, metal, and non-metal mines. The contributions of various parameters, including mine type, injured body part, days lost, age, and experience on the rate of accidents and injuries were investigated across the commodity types. The results showed coal miners in the East region are at a higher risk of …
Design And Fabrication Of Nanostructured Electrodes For Complementary Electrochemical And Photoelectrochemical Water Splitting,
2022
The American University in Cairo AUC
Design And Fabrication Of Nanostructured Electrodes For Complementary Electrochemical And Photoelectrochemical Water Splitting, Kholoud El Sayed Abousalem
Theses and Dissertations
Designing highly active, durable, and nonprecious electrodes for overall water splitting is of urgent scientific importance to realize sustainable hydrogen production. Accordingly, the need to search efficient energy production systems is of crucial necessity. In this thesis, two various systems for sustainable hydrogen production have been reported using electrochemical and photoelectrochemical pathways. In the first part of the thesis, electrochemical water splitting involving both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) has been established. To this end, an innovative approach is demonstrated to synthesize flower-like 3D homogenous trimetallic Mn, Ni, Co phosphide catalysts directly on nickel foam via …
The Adaptive Detection Technology Of Ultrasonic Flow In Mining Boreholes,
2022
Xi’an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi’an 710077, China
The Adaptive Detection Technology Of Ultrasonic Flow In Mining Boreholes, Dai Chenyu, Zhao Pengpeng, Xu Jing
Coal Geology & Exploration
For a better flow monitoring at the borehole of underground gas drainage in coal mines, and in response to the influence of factors such as complex composition, poor purity and poor stability of the medium in the pipeline on the measurement accuracy of drainage flow parameters, a set of adaptive detection system of ultrasonic flow for mining boreholes is designed with the time difference method as the measurement principle and the double threshold comparison method as the detection method. The overall scheme of the detection system is designed based on the analysis of the key problems affecting the measurement accuracy …
Construction And Demonstration Of The Transparent Geological Guarantee System In Tangjiahui Coal Mine,
2022
Huaihe Energy Western Coal and Power Group, Ordos 017000, China
Construction And Demonstration Of The Transparent Geological Guarantee System In Tangjiahui Coal Mine, Liu Jiegao, Cheng Jianyuan, Shu Yiguo, Liu Zaibin, Gao Yingui, Gao Yaoquan, Lu Ziqing
Coal Geology & Exploration
The intelligence construction of Tangjiahui Coal Mine is confronted with constrains such as water-conducting faults and pressure of Ordovician limestone water, and how to make the geological conditions transparent has become the technical bottleneck of intelligent mining. Tangjiahui Coal Mine puts emphasize on the prevention and control of water disasters and adopted five advanced technologies, including borehole transient electromagnetic technology, multi-borehole resistivity, seismic while excavating, seismic while mining, microseismic monitoring to build a real-time dynamic transparent geological guarantee system. The system realizes the prevention and control of water disasters, rapid excavation and intelligent mining based on transparent geological models, which …
Influential Factors Of The Electromagnetic Wave Instrument While Drilling In Coal Seam Horizontal Wells And Resistivity Simulation Calculation,
2022
School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China; Xi’an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi’an 710077, China
Influential Factors Of The Electromagnetic Wave Instrument While Drilling In Coal Seam Horizontal Wells And Resistivity Simulation Calculation, Chen Gang, Zhang Jiguan, Li Quanxin, Liu Zhiyi
Coal Geology & Exploration
In order to figure out the influential factors of the detection by the electromagnetic wave instrument while drilling in coal seam horizontal wells, we studied the impacts of roof and floor surrounding rock resistivity, instrument eccentricity, coal seam borehole collapse and coal seam thickness on the measurement of resistivity through finite element numerical simulation. The resistivity response law of the amplitude ratio and phase difference calculation under the condition of high-resistivity coal rock formation was analyzed. On this basis, a three-layer geological mathematical model was established to simulate the difference between analytical and numerical solutions of the amplitude ratio and …
