Progress In The Research On Drilling Technology And Equipment In Coal Mining Areas Of China,
2019
Xi'an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi'an 710077, China
Progress In The Research On Drilling Technology And Equipment In Coal Mining Areas Of China, Li Quanxin, Shi Zhijun, Tian Hongliang, Yao Ke, Liu Jianlin, Yao Yafeng, Xu Chao, Fang Jun, Liu Fei
Coal Geology & Exploration
Drilling technology and equipment play a key role in coalbed methane(gas) development and ensuring coal mine safe production in coal mining areas. The complicated geological and mining conditions of coal seams in China determine that the drilling technology and equipment must be based on the basic situation of coal mining areas and take the way of independent innovation. The representative achievements of drilling technology and equipment in coal mining area during the Eleventh Five-Year Plan and the Twelfth Five-Year Plan were systematically summarized in this paper. Additionally, it presents comprehensive introduction to the great achievements of surface drilling and underground …
Design Of Parameter Monitoring Software For Full Hydraulic Drilling Rig Based On Embedded Technology,
2019
Xi'an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi'an 710077, China
Design Of Parameter Monitoring Software For Full Hydraulic Drilling Rig Based On Embedded Technology, Liao Jiangnan, Jiang Nan, Song Haitao, Dong Hongbo, Ma Bin
Coal Geology & Exploration
In order to reduce the development cost of the coal mine hydraulic drilling rig monitoring and diagnosis system, realize the versatility and portability of the monitoring and diagnosis system, and simplify the operation process, an embedded parameter monitoring software for the domestic mainstream full hydraulic drilling rig was designed. The software took STM32F407 microprocessor as the running environment and was developed in the environment of Visual Studio 2013 with C language. After completing GUI simulation on emWin Simulation, the software function verification experiment was carried out on the ZDY4000LR drilling rig. The experiment shows that the software ran stably and …
Design Of Remote Control System Of Drilling Rig In Coal Mines,
2019
Xi'an Research Institute Co. Ltd., China Technology and Engineering Group Corp., Xi'an 710077, China; School of Mechanical Engineering, Xi'an Jiaotong University, Xi'an 710049, China
Design Of Remote Control System Of Drilling Rig In Coal Mines, Weng Yinsheng, Wu Di, Lu Feifei, Wang Longpeng
Coal Geology & Exploration
In order to solve the influence of the dangerous conditions in the deep mine, such as large percus-sive ground pressure and high temperature and humidity of the roadways in deep mines on drilling operation, a remote control drilling rig control system is designed. The control system consists of local control terminal and remote control terminal, both communicating by CAN(Controller Area Network) bus and optical fiber for data and image. Local control terminal core uses automobile PLC(Programmable Logic Controller) as the control core to realize data acquisition and control, develops program in CoDeSys. The remote control terminal, based on MCU and …
Trajectory Design Of Oblique Section In Nearly Horizontal Directional Hole In Inclined Formation In Underground Coal Mine,
2019
Xi'an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi'an 710077, China
Trajectory Design Of Oblique Section In Nearly Horizontal Directional Hole In Inclined Formation In Underground Coal Mine, Zhang Yingjie, Zhao Yongzhe, Yang Zhong, Mo Haitao
Coal Geology & Exploration
Trajectory design of the near-horizontal directional drilling technology in underground coal mine is one of key aspects to successfully implement the technology. The trajectory of hole in a nearly horizontal formation is designed generally by two-dimensional method, and this method usually leads to the problem that the deflecting section of the hole travels out of the inclined target formation.Therefor, the calculation methods of the drilled formation true thickness were studied in the paper, the method using the unit normal vector of formation was proposed, and computation table in Excel was developed to guide trajectory design of near-horizontal directional drilling. The …
Geological Consideration For Site Selection Of Underground Coal Gasifier,
2019
Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process of the Ministry of Education, China University of Mining and Technology, Xuzhou 221008, China
Geological Consideration For Site Selection Of Underground Coal Gasifier, Han Lei, Qin Yong, Wang Zuotang
Coal Geology & Exploration
Underground coal gasification(UCG) is a revolution in traditional coal mining technology, and the site selection of underground coal gasifier is a prerequisite for a successful UCG project. Refining and analyzing the previous research results, the principle of UCG and the geological controls of site selection of underground coal gasifier were reviewed. The results show that lignite is the most suitable for UCG. UCG should choose thickness greater than 2 m, angle is less than 70° and buried depth of coal seam is 300 to 2 000 meters. At the same time, the UCG process may pollute the groundwater, and the …
Fracture Extension Law Of Hydraulic Fracture In Coal With Different Structure,
2019
School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China
Fracture Extension Law Of Hydraulic Fracture In Coal With Different Structure, Jia Qifeng, Ni Xiaoming, Zhao Yongchao, Cao Yunxing
Coal Geology & Exploration
To find out the fracture extension law of coal hydraulic fracturing with different coal body structures can lay a foundation for reasonable well pattern deployment. Taking Shizhuang block of Qinshui basin as the research object, the fracture of coal core was observed, and four kinds of coal with fracture development degree were divided. Based on the theory of rock mass mechanics, the stress field calculation model of fracture tip and the judgment criterion of whether hydraulic fracture can pass through natural fracture in hydraulic fracturing process were established. According to the measured data of CBM wells, the reliability of theoretical …
Study On Pore Structure And Pressure-Sensitive Effect Of Tectonic Coal In Huaibei Xutuan Mine,
2019
China Coal Research Institute, Beijing 100013, China; Xi'an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi'an 710077, China
Study On Pore Structure And Pressure-Sensitive Effect Of Tectonic Coal In Huaibei Xutuan Mine, Dong Kui, Jia Jiancheng, Gong Zewen, Wu Yan
Coal Geology & Exploration
In order to discuss pore structure and pressure-sensitive effect of tectonic coal, coal samples of Huaibei Xutuan mine were measured by optical microscope, scanning electron microscope, mercury injection, and triaxial servo-controlled seepage equipment for thermo-fluid-solid coupling to reveal the pore structure and the influence of effective stress on permeability or permeability coefficient of structural coal. The results show that cataclastic structure of tectonic coal is regular, flat and has good connectivity; the pores of primary coal are mainly composed of micropores, micropores and transitional pores are dominant in tectonic coal has. The effective stress of ductile deformed coal has a …
Preparation Of Polished Slice Of Special Coal And Its Influence On Coal Petrology Analysis,
2019
Xi'an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi'an 710077, China
Preparation Of Polished Slice Of Special Coal And Its Influence On Coal Petrology Analysis, Liu Shande
Coal Geology & Exploration
Coal petrology analysis is widely used in coal facies research, geological exploration and coal blending test. Qualified polished coal slice is the premise of coal petrology analysis. In order to solve the preparation problem of special coal optical plates, such as brittle samples and aging coal optical plates, a complete preparation process was raised, and the feasibility of the process was verified. The results showed that Rmax was very little affected by secondary preparation, but the maceral group composition content was significantly affected, and the fluctuation of the anthracite' microcomponent was the greatest. When the maceral group composition quantification …
Reservoir-Forming Conditions Of Shale Gas In Badaowan Formation In Fukang Area, Xinjiang,
2019
State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Beijing 100083, China; College of Geosciences and Surveying Engineering, China University of Mining and Technology, Beijing 100083, China
Reservoir-Forming Conditions Of Shale Gas In Badaowan Formation In Fukang Area, Xinjiang, Zhang Min, Li Xianqing, Zhang Jizhen, Sun Jie, Liang Wanle, Duan Zhiyou, Li Hanqing
Coal Geology & Exploration
In order to evaluate the potential of shale gas of coal measures in Fukang area, Xinjiang, taking the shale of Jurassic coal measures in Badaowan Formation as an example, the study was carried out and the favorable accumulation area for shale gas was preliminarily put forward according to the drilling, core data and sample analysis results in this paper. The result shows that the accumulative thickness of Jurassic Badaowan Formation shale is big(200-400 m), the buried depth is shallow(<1 500 m), the organic carbon content is high(average TOC>2.0%), mainly of type Ⅲ and Ⅱ2, thermal evolution level is moderate(Rran is 0.8%-1.1%, mature), physical property of reservoir …
Modification Of Na-K-Mg Triangular Diagram And Selection Of Na-K Geothermometer,
2019
State Key Laboratory of Geological Disaster Prevention and Environmental Protection, Chengdu University of Technology, Chengdu 610059, China
Modification Of Na-K-Mg Triangular Diagram And Selection Of Na-K Geothermometer, Wang Xin, Qi Jihong, Xu Mo, Ma Xiaoyun
Coal Geology & Exploration
Na-K-Mg triangular diagram is a preliminary method of determining the water-rock equilibrium state. It does not specifically consider the effect of geothermometer equations and mineral compositions on the equilibrium state. Therefore, using the Na-K-Mg triangular diagram modified by different Na-K geothermometer equations to judge water-rock equilibrium state, and using the suitable Na-K geothermometer equation to calculate the temperature of geothermal reservoirs, is of great significance to divide the genetic types of geothermal systems and develop or utilize geothermal resources. It is found that any point in the modified Na-K-Mg triangular diagram is fully equilibrated with the curve determined by one …
Characteristics Of Height Of Water Flowing Fractured Zone Caused During Ful-Ly-Mechanized Caving Mining In Huanglong Coalfield,
2019
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 Height Of Water Flowing Fractured Zone Caused During Ful-Ly-Mechanized Caving Mining In Huanglong Coalfield, Li Chaofeng
Coal Geology & Exploration
In order to study the law of height of water flowing fractured zone caused by fully-mechanized caving mining in Huanglong coalfield, this paper has systematically collected the measured data in the region, and methods of mathematical statistics and regression analysis were used to study the relationship among the height of water flowing fractured zone, width of working face, depth of coal seam and height of coal mining. The results show that:When the width of working face was less than 240 m and the height of coal mining was 8.5 to 9.5 m, the height of water flowing fractured zone under …
Coal Mine Water Inrush Prediction Based On Lstm Neural Network,
2019
School of Information and Control Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China
Coal Mine Water Inrush Prediction Based On Lstm Neural Network, Dong Lili, Fei Cheng, Zhang Xiang, Cao Chaofan
Coal Geology & Exploration
According to the prediction of water inrush from coal seam floor, based on the summarization of existing water inrush prediction methods and theories, the feature selection experiment shows that water pressure, distance from the working surface, sandstone section thickness, coal thickness, coal seam inclination, fault throw, fissure zone, mining area, mining height and strike length are the main factors affecting the occurrence of water inrush. These factors are complex and non-linear. A water inrush prediction model based on long short-term memory(LSTM) neural network was proposed. The data of the coal mine water inrush case was used as sample data to …
Influence Of Composite Roof Structure On The Stability Of Coal Roadway,
2019
College of Architecture and Civil Engineering, Xi'an University of Science and Technology, Xi'an 710054, China
Influence Of Composite Roof Structure On The Stability Of Coal Roadway, Chen Xinnian, Wang Jingchun, Xiong Xianyu, Fan Jiawei, Shen Pan
Coal Geology & Exploration
The composite roof structure of coal roadway is rather complex. Its stability is related to lithology, thickness of strata, number of strata, location of strata and cohesive force between layers. Based on mechanics theory of simplified composite roof composite beams, a simplified mechanical test model of composite beams was established, and the effects of the structural characteristics of composite roof on the stability of composite beams were analyzed by experiments. The purpose is to provide a scientific basis for the classification and control of composite roof stability. The results show that the stability of the roof increases with the increase …
Numerical Analysis Of Temperature Field Of Underwater Dredging Artificial Frozen Plate,
2019
College of Civil Engineering and Architecture, Hainan University, Haikou 570228, China
Numerical Analysis Of Temperature Field Of Underwater Dredging Artificial Frozen Plate, Wu Yuwei, Hu Jun, Wang Zhixin, Zeng Dongling, Wang Shucheng
Coal Geology & Exploration
In order to understand the development of the temperature field of artificial freeze dredging plates and the process of the formation of frozen curtains, the finite element analysis was used to perform numerical analysis using the single factor analysis method for research of the frozen process in different circumstances of geometric size of plate and physical environment of the soil under water. The results show that the correlation between the different geometric dimensions of the frozen plate and the dredging depth is weak, and the geometric dimension of the frozen plate can only change the area of dredging; for the …
Method For Determination Of Measurent Time Of Resistivity Logging In Artificial Well Liquid,
2019
Xi'an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi'an 710077, China; Department of Geology, Northwest University, Xi'an 710069, China; State Key Laboratory of Continental Dynamics, Northwest University, Xi'an 710069, China
Method For Determination Of Measurent Time Of Resistivity Logging In Artificial Well Liquid, Wang Haijun, Ma Liang
Coal Geology & Exploration
In order to solve the problem of determining the most critical parameter of the logging time of artificial well fluid resistivity logging, and get rid of the method that depends on the construction experience for a long time, guide logging technicians to obtain reliable logging curves, from the factors influencing the measurement time, the mass conservation law was used to build the calculation model for the best measurement time of logging, the computational formula for the best measurement time was derived, which was verified through in-site contrast experiment of boreholes. The results show that the computational formula set up by …
Properties Of Mud Cake Associated With Silica Shale Powder Intrusion Into Drilling Fluid,
2019
School of Geosciences and Information Physics, Central South University, Changsha 410083, China; Key Laboratory of Metallogenic Prediction and Geoenvironmental Monitoring of the Ministry of Education, Changsha 410083, China
Properties Of Mud Cake Associated With Silica Shale Powder Intrusion Into Drilling Fluid, Mo Dingqiang, Sun Pinghe, Zhao Binkui, Wang Jingyuan, Zhang Shaohe, Cao Han
Coal Geology & Exploration
Drilling fluid is very important for maintaining the stability of the hole wall in shale drilling. The mud cake formed by the fluid loss also plays a decisive role in protecting the reservoir. In order to study the influence of shale rock powder intrusion into low-solid-phase drilling fluids on the basic properties of mud cakes, the paper selects the siliceous shale powders in northwestern Hunan as the research object, and designs orthogonal experiments. In addition, the test results are analyzed using variance and range, which show that the content of rock powder is the main factor affecting the thickness of …
Cryptocurrency Mining On Mobile As An Alternative Monetization Approach,
2019
Singapore Management University
Cryptocurrency Mining On Mobile As An Alternative Monetization Approach, Nguyen Phan Sinh Huynh, Kenny Choo, Rajesh Krishna Balan, Youngki Lee
Research Collection School Of Computing and Information Systems
Can cryptocurrency mining (crypto-mining) be a practical ad-free monetization approach for mobile app developers? We conducted a lab experiment and a user study with 228 real Android users to investigate different aspects of mobile crypto-mining. In particular, we show that mobile devices have computational resources to spare and that these can be utilized for crypto-mining with minimal impact on the mobile user experience. We also examined the profitability of mobile crypto-mining and its stability as compared to mobile advertising. In many cases, the profit of mining can exceed mobile advertising's. Most importantly, our study shows that the majority (72%) of …
Adsorbability Of Shale In Coal Measures And Its Influencing Factors,
2019
Key Laboratory of Coalbed Methane Resources and Accumulation Process, Ministry of Education, China University of Mining and Technology, Xuzhou 221116, China
Adsorbability Of Shale In Coal Measures And Its Influencing Factors, Zhang Baoxin, Fu Xuehai, Zhang Qinghui, Zhou Baoyan, Liu Zheng
Coal Geology & Exploration
In order to reveal the adsorption and gas-bearing characteristics of shale in coal measures, this study was based on the gas content, isotherm adsorption, high-pressure mercury injection, and liquid nitrogen adsorption of more than 200 coal shale in six major coal fields in Shanxi Province and Junggar basin. XRD diffraction and other measured data, the adsorption and gas characteristics of shale were analyzed, and the influencing factors were discussed. The results show that the measured gas content of shale is between 0-5.87 cm3/g, concentrated at 0.90-2.00 cm3/g; VL is between 0.11-6.3 cm3/g with …
Distribution Characteristics Of Associated Elements In Middle Jurassic Coal In The North Of Datong Coalfield And Their Geological Significance,
2019
Shanxi Coal Geological Exploration and Research Institute, Taiyuan 030031, China
Distribution Characteristics Of Associated Elements In Middle Jurassic Coal In The North Of Datong Coalfield And Their Geological Significance, Qu Xiaorong
Coal Geology & Exploration
In order to study the geochemical characteristics and geological significance of associated elements in Middle Jurassic coal of Datong coalfield, the distribution and occurrence of the associated elements in 9 coal seams in the northern Datong coalfield were analyzed by inductively coupled plasma mass spectrometry(ICP-MS), X-ray diffraction(XRD), optical electron microscopy and scanning electron microscopy(SEM). The results show that the Jurassic coal in Datong coalfield has low trace element content, and beneficial elements(Li, Ga) are far lower than the boundary grade, which has no development potential. But the harmful elements such as Co and Zn in No.2 coal, Tl in No.9, …
Storage Rule And Controlling Factors Of Coalbed Gas In Zhaoguan Mine Field Of Huanghebei Coalfiled,
2019
China Coal Research Institute, Beijing 100013, China; Xian Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xian 710077, China
Storage Rule And Controlling Factors Of Coalbed Gas In Zhaoguan Mine Field Of Huanghebei Coalfiled, Song Xiaozhong
Coal Geology & Exploration
Storage rule and controlling factors of coalbed gas in Zhaoguan mine field were analyzed on the basis of the generation, storage and migration theory of coalbed gas in combination with the data of geological exploration and mine production. From research on the regional geological evolution, coal generating and storing capacity and lithologic characteristics, geological structure, burial depth, bedrock thickness, hydrogeological conditions and magmatic intrusion, it was found that underground hydrodynamic conditions and magmatic intrusion events are the controlling factors of coalbed gas storage in the mine. Underground hydrodynamic conditions had obvious effect, shallow hydrodynamic conditions were manifested mainly as migration …
