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Articles 1771 - 1800 of 1943
Full-Text Articles in Mining Engineering
The Matching Of Gas Production Curve Characteristic And Reservoir Conditions In Vertical Coalbed Methane Wells, Han Wenlong, Wang Yanbin, Liu Du, Chang Hong, Ding Tao
The Matching Of Gas Production Curve Characteristic And Reservoir Conditions In Vertical Coalbed Methane Wells, Han Wenlong, Wang Yanbin, Liu Du, Chang Hong, Ding Tao
Coal Geology & Exploration
The matching of coalbed methane(CBM) production curve type and geological conditions directly affects the gas production. Based on dividing gas production curves types of vertical CBM wells in the southern block of Shizhuang in Qinshui basin over 4 years, the characteristics of gas production curve were analyzed. The matching of gas production curve with reservoir parameters was further analyzed. The paper discovered and divided the gas production curve into four types:type of fast rising of single peak, type of stable rising of single peak, bimodal type of being low later and bimodal type of being high later. The original permeability, …
Application Of Sec Dynamic Reserves Evaluation Method In Coalbed Methane Field: A Case From Hancheng Block In Ordos Basin, Yi Wei, Xiong Xianyue, Cao Yimin, Ding Rong
Application Of Sec Dynamic Reserves Evaluation Method In Coalbed Methane Field: A Case From Hancheng Block In Ordos Basin, Yi Wei, Xiong Xianyue, Cao Yimin, Ding Rong
Coal Geology & Exploration
At present, all the SEC reserves evaluation of coalbed methane fields uses dynamic assessment methods. In the process of evaluation, the parameters and calculation results are various. In order to solve this problem, this paper takes the Hancheng block in Ordos basin as an example, a series of evaluation methods adapted to the production characteristics of coalbed methane have been comprehensively applied, optimizing various parameters, and summarizing the law of decline. The results show that geological units are divided according to tectonic conditions, and on this basis, evaluation units are divided according to development effect, which can objectively and reasonably …
Prediction Of The Height Of Water Flowing Fractured Zone Under Subcritical Mining Based On Dimensional Analysis, Lou Gaozhong, Guo Wenbing, Gao Jinlong
Prediction Of The Height Of Water Flowing Fractured Zone Under Subcritical Mining Based On Dimensional Analysis, Lou Gaozhong, Guo Wenbing, Gao Jinlong
Coal Geology & Exploration
In order to accurately predict the height of water flowing fractured zone under subcritical mining, mining thickness M, mining depth H, inclined length of working face L, dip angle of coal seam α, overburden mechanical properties R, overburden structure characteristics S were selected as the main influencing factors on the height of water flowing fractured zone under subcritical mining. Dimensionless relations between the height of water flowing fractured zone and M, H, L, α, S were established by dimensional analysis. Based on 30 sets of measured data, the optimal function relation of dimensionless relation was …
Ga_Svm_Adaboost Model For Prediction Of Earthquake-Induced Sandy Soil Liquefaction, Mao Zhiyong, Huang Chunjuan, Lu Shichang
Ga_Svm_Adaboost Model For Prediction Of Earthquake-Induced Sandy Soil Liquefaction, Mao Zhiyong, Huang Chunjuan, Lu Shichang
Coal Geology & Exploration
In order to predict the liquefaction of sand, the seismic intensity, groundwater level, covering thickness, standard number, average particle size, landform, soil quality and inhomogeneity coefficient are selected as influencing factors. Genetic algorithm(GA) is used to optimize the parameters of support vector machine(SVM) by using correlation analysis and factor analysis model, and combining with Adaboost iterative algorithm, the GA_SVM_Adaboost model for predicting the liquefaction of sand is established. 329 sets of survey data of sandy liquefaction site in Tangshan earthquake were used to train the model, and 68 samples of sandy liquefaction data were predicted by using the good model. …
Development Of High Temperature Borehole Inclinometer, Qu Zhaogui, Gong Mingmao, Zhou Ce, Wang Guangzhai
Development Of High Temperature Borehole Inclinometer, Qu Zhaogui, Gong Mingmao, Zhou Ce, Wang Guangzhai
Coal Geology & Exploration
In the detection of high-temperature and high-pressure dry heat rock drilling location trajectory, the instrument has some problems, such as poor performance, poor stability, low measurement accuracy and large energy consumption. A set of high temperature borehole inclining device is designed to solve the problem of high temperature and high pressure measurement deviation and temperature measurement. Adopt high temperature resistant components, design control and measurement circuit. Automatic intermittent power supply is adopted to reduce heat dissipation and power consumption. The design of heat preservation pipe and pressure detection pipe is carried out by using ANSYS finite element software to conduct …
Experimental Study On The Influence Of Well Inclination Angle Of Coalbed Methane Well On The Cementation Strength Of Cement-Formation Interface, Gu Jun, Li Linwei, Sun Dexing
Experimental Study On The Influence Of Well Inclination Angle Of Coalbed Methane Well On The Cementation Strength Of Cement-Formation Interface, Gu Jun, Li Linwei, Sun Dexing
Coal Geology & Exploration
In order to control the problem of water channeling in the process of coalbed methane(CBM) production, based on the self-designed test device and method, the test data of the shear strength at cement-aquiclude interface (CAI) is obtained under the conditions of well inclination of 0°, 30°, 60° and 90°. The mechanism of the influence of inclination angle on the shear strength at CAI is analyzed. The results show that the shear strength at CAI decreases with the increase of the inclination angle. The reason is that as the inclination angle increases, the upper part of the mud cake ring becomes …
Application Of Wire Line Coring Technique In Overburden Drilling, Li Baijun, Zou Run, Guo Chao
Application Of Wire Line Coring Technique In Overburden Drilling, Li Baijun, Zou Run, Guo Chao
Coal Geology & Exploration
In order to improve the drilling efficiency of two oil and gas geological survey wells "Jitaodi 1" and "Ji Bai Di 1" in Baicheng area of Jilin Province, wireline coring technique was applied in overburden drilling. Based on the lithological characteristics of the drilled strata, combined with the technological characteristics of core extraction by lifting the drill pipe and wireline core extraction, by designing the bit, drilling flushing fluid and by improving drilling procedure parameters, drilling tool nozzle flow channel, the wireline coring drilling method has been successfully applied in drilling overburden strata(about 1 100 m thick). Compare with the …
Research On Key Technology Of The 15 000 N·M High-Power Directional Drilling Rig, Fang Peng
Research On Key Technology Of The 15 000 N·M High-Power Directional Drilling Rig, Fang Peng
Coal Geology & Exploration
According to the actual demand for ultra-long distance directional drilling in coal seam and large diameter directional drilling in seam roof, and the function of compound directional drilling technology for drilling rig, the technical idea of modular development for the functional development and design of high-power directional drilling rig are put forward. Combined with the contradiction among high-power matching, large capacity output and compact layout design of drilling rig, the key technologies of 15 000 N·m high-power directional drilling rig are researched in this paper, including overall layout design, large capacity rotary head design and layer board analysis, large opening …
Hole-Bottom Hydraulic Pressurization Technology For Directional Drilling In Hard Rock In Underground Coal Mines, Xu Baolong, Yao Ningping, Wang Li, Cao Jing, Dou Xuqian
Hole-Bottom Hydraulic Pressurization Technology For Directional Drilling In Hard Rock In Underground Coal Mines, Xu Baolong, Yao Ningping, Wang Li, Cao Jing, Dou Xuqian
Coal Geology & Exploration
In order to solve the problem of large feeding pressure, low drilling efficiency and limited hole depth caused by the backing effect of drill string during directional drilling of deep hole in underground coal mines, a technical idea of using hydraulic tool to increase WOB was proposed. The structural design of the hydraulic pressurizer at the bottom of the hole was carried out by drawing on the structure of the hydraulic pressurizer in the field of oil drilling and combining the nearly horizontal drilling conditions in underground coal mines. The hydraulic parameters were designed by the theoretical calculation and the …
Progress And Prospects Of Coal Geological Work In Tibet, Qiao Junwei, Ning Shuzheng, Song Shiyu, Yang Cheng
Progress And Prospects Of Coal Geological Work In Tibet, Qiao Junwei, Ning Shuzheng, Song Shiyu, Yang Cheng
Coal Geology & Exploration
Through the summary of the coal geological work and achievements in Tibet for nearly 70 years, the current status and main results of coal geological exploration in the main coal mines in the region were reviewed. The formation age, distribution range, coal content and coal quality characteristics of coal-bearing strata in major coal mines in the region were found out. The division of coal-bearing tectonic units and coal-accumulating basins in Tibet was summarized, and the sedimentary systems and sedimentary environments of coal-bearing strata in the main coal-forming periods were preliminarily summarized. It is generally believed that the overall degree of …
Analysis Of Diffusion Properties Of Methane In Low Rank Coal, Meng Zhaoping, Zhang Guiyuan, Li Guoqing, Liu Jinrong
Analysis Of Diffusion Properties Of Methane In Low Rank Coal, Meng Zhaoping, Zhang Guiyuan, Li Guoqing, Liu Jinrong
Coal Geology & Exploration
Diffusion properties of methane in coal is an important reservoir parameter affecting CBM production. Using the lignite samples from the Xiaolongtan Formation of the Miocene Neogene in southeastern Yunnan Province, the isothermal adsorption experiments of methane in low rank coal were carried out. Based on the relationship between adsorption amount and time obtained from isothermal adsorption experiment, the diffusion coefficient of methane in coal was calculated by using an unipore model of unsteady gas diffusion. The diffusion law of methane in coal and its control mechanism were revealed. The results show that gas diffusion law in coal obeys Langmuir equation; …
Study On Complex Resistivity Of Artificial Sandstone Containing Conductive Mineral Under High Pressure, Tian Gang, Tang Xingong, Xiang Kui, Chi Meiyao
Study On Complex Resistivity Of Artificial Sandstone Containing Conductive Mineral Under High Pressure, Tian Gang, Tang Xingong, Xiang Kui, Chi Meiyao
Coal Geology & Exploration
Due to the complex pore structure and non-single skeleton composition, natural rock samples are more difficult to study than artificial rock samples. The standard rock samples with different mineral content and volume content were artificially synthesized by using brass powder, pyrite sand, graphite powder, epoxy resin, etc. Complex resistivity measurements were taken to the samples by using AutoLab-1000 equipment under different formation pressure conditions. The complex resistivity and the parameters of zero frequency resistivity, polarizability, and time constant of the artificial sandstone standard were derived based on Debye decomposition model. Made a discussion on relationship between parameters of the model, …
Theoretical Research On The Ploughing Rock Breaking Properties Of New Conical Pdc Cutter, Ju Pei, Wang Chuanliu
Theoretical Research On The Ploughing Rock Breaking Properties Of New Conical Pdc Cutter, Ju Pei, Wang Chuanliu
Coal Geology & Exploration
The researches on the conical PDC cutter are now focused on numerical simulation, field and laboratory tests, the theoretical analysis on its mechanical properties has not been reported. Therefore, the tensile shear rock breaking mechanism and cutting load distribution characteristics of the conical PDC cutter are described by numerical simulation, the theoretical formula of the cutting load is derived according to the energy balance principle. Results show that comparing with the conventional cylindrical PDC cutter, the rock breaking process of conical PDC cutter is more stable, the cutting load is influenced by the rock properties, the parameters of cutter structure, …
Model Of Gas-Bearing Coal Permeability Prediction Based On Apso-Wls-Svm, Mao Zhiyong, Huang Chunjuan, Lu Shichang, Han Rongyue
Model Of Gas-Bearing Coal Permeability Prediction Based On Apso-Wls-Svm, Mao Zhiyong, Huang Chunjuan, Lu Shichang, Han Rongyue
Coal Geology & Exploration
In order to predict gas-bearing coal permeability accurately and prevent gas accidents effectively, a weighted least square support vector machine(WLS-SVM) algorithm based on Adaptive Particle Swarm Optimization(APSO) is proposed. Based on the related theory and literature research on gas-bearing coal permeability, the effective stress, gas pressure, temperature and compressive strength were selected as the main characteristic indexes. The APSO algorithm was used to optimize the combination parameters(C, σ) of the WLS-SVM model and APSO-WLS-SVM gas-bearing coal permeability prediction model was established. According to the field data, 40 sets of data were used as training samples and the remaining …
Study On Development Height Of Permeable Fractured Zone Based On Overburden Failure Transfer, Zhao Gaobo, Guo Wenbing, Lou Gaozhong, Ma Zhibao
Study On Development Height Of Permeable Fractured Zone Based On Overburden Failure Transfer, Zhao Gaobo, Guo Wenbing, Lou Gaozhong, Ma Zhibao
Coal Geology & Exploration
It is extremely significant for coal mining under water bodies and water conservation mining to research overburden failure and the height of permeable fractured zone. The processes of overburden failure transfer were analyzed, which could be divided into transmission development stage and transmission termination stage. Through theoretical analysis, mechanical model of strata suspended integrity and overhanging stability were established. The limited suspension distance and overhang distance of each stratum were proposed to judge the damage of each layer. A new theoretical method to predict the development height of permeable fractured zone was put forward. The project example was compared with …
Data Modeling And Analysis Of Coal Resources Based On 3dmine Software, Liu Xiaoning, Luo Jinhui, Ma Xiaoli, Dong Zhibo
Data Modeling And Analysis Of Coal Resources Based On 3dmine Software, Liu Xiaoning, Luo Jinhui, Ma Xiaoli, Dong Zhibo
Coal Geology & Exploration
Taking No.3 coal in Gucheng coal mine, Shandong Province as the target, 3D coal seam entity models were built in 3DMine software, coaly quality indices' distributions were analyzed and coal reserve was calculated and compared to the reserve estimation in method of geological block. Firstly, a boreholes database is established using the geological data and borehole data of the target, and a 3D surface model of the coal seam with faults embedded was constructed. Then, the surface model was interpolated into an entity blocks model through the algorithm of inverse distance weighted(IDW) interpolation. Finally, the recoverable coal reserve of the …
Research On Collapsibility Of A Loess Site In Pakistan, Liu Chunlong, Zhang Zhiqiang, Liu Fengyin, Liu Naifei, Sun Hongchao, Lyu Wenjun
Research On Collapsibility Of A Loess Site In Pakistan, Liu Chunlong, Zhang Zhiqiang, Liu Fengyin, Liu Naifei, Sun Hongchao, Lyu Wenjun
Coal Geology & Exploration
The loess of an area in Pakistan is the Quaternary Holocene alluvium. The study and existing geological data in this area are relatively few, and special research is needed. In order to determine the distribution and collapsibility of the lo-ess, based on the construction distribution of the loess site, undisturbed soil sample was selected at the typical location. The unconfined compression strength tests and compressive tests were carried out. The structural characteristics of loess were quantitatively described by structural index. The self-weight collapsible coefficient and collapsible coefficient of loess were determined, the self-weight settlement and the total settlement were calculated …
Table Of Contents, The Editors
Technology And Method Of Cbm Concurrent Exploration During Coal Resources Exploration, Lin Yabing, Qin Yong, Duan Zhonghui, Ma Dongmin
Technology And Method Of Cbm Concurrent Exploration During Coal Resources Exploration, Lin Yabing, Qin Yong, Duan Zhonghui, Ma Dongmin
Coal Geology & Exploration
The coal seam serves as a geological carrier for CBM, and exploration of CBM and coal resources is a man-datory requirement for the management of national mineral resources. Based on the practice of project exploration in recent years, it analyzed the evaluation criteria of CBM resources in the process of coal resources exploration. On this basis, the exploration ideas, exploration methods, tasks, report preparations have proposed a method system for CBM in the ex-ploration of coal resources. According to the particularity of CBM exploration work methods, CBM seismic, well logging, drilling, well log, gas drainage, and engineering quality acceptance methods …
Experimental Of Water Unlocking Stimulation Mechanism On Surfactant Fracturing Fluid, Song Jinxing, Yu Shiyao, Su Xianbo, Wang Qian
Experimental Of Water Unlocking Stimulation Mechanism On Surfactant Fracturing Fluid, Song Jinxing, Yu Shiyao, Su Xianbo, Wang Qian
Coal Geology & Exploration
This paper presents an experimental study of water unlocking stimulation mechanism on surfactant fracturing fluid based on the measurements of surface tension, contact angle, gas-phase permeabilities and desorption of nitrogen on synthetic coal samples. The coking coal in Liulin zone of Hedong coal field was used as testing object in this study. Active water and surfactant fracturing fluids were used as testing liquids in this study. Results show that the surfactant fracturing fluid(1.5%KCl+0.05%AN) reduces the surface tension of active water fracturing fluid(1.5%KCl) and increases the wettabil-ity of active water fracturing fluid to coal reservoir; the surfactant fracturing fluid reduces the …
The Characteristics Of Organic Matter In Coal-Measure Source Rocks And Coal-Measure Gas Resource Potential In Eastern Henan Province, Yang Yanqing, Zhang Xiaodong, Xu Yakun, Zhang Peng, Wang Kun, Zhu Chunhui
The Characteristics Of Organic Matter In Coal-Measure Source Rocks And Coal-Measure Gas Resource Potential In Eastern Henan Province, Yang Yanqing, Zhang Xiaodong, Xu Yakun, Zhang Peng, Wang Kun, Zhu Chunhui
Coal Geology & Exploration
In order to evaluate the hydrocarbon generation potential of coal-measure source rocks in eastern Henan Province, based on the measurement results of organic carbon content, vitrinite reflectance and the identification of maceral and type of kerogen in source rocks, the organic geochemical characteristics and the resource potential of coal-measure gas in different blocks of eastern Henan Province were comprehensively analyzed, and favorable blocks for coal-measure gas exploration were designated. The results show that the organic carbon mass fraction of coal-measure source rocks presents low as a whole(less than 1.5%). Kerogen in coal-measures source rocks is mainly of type Ⅲ and …
Analysis Of Water Abundance Characteristics Of Sandstone Aquifer In Luohe Formation On The Basis Of Arcgis, Hou Enke, Long Tianwen, Liu Qingli, Wang Fei, Fan Zhigang
Analysis Of Water Abundance Characteristics Of Sandstone Aquifer In Luohe Formation On The Basis Of Arcgis, Hou Enke, Long Tianwen, Liu Qingli, Wang Fei, Fan Zhigang
Coal Geology & Exploration
Aquifer water abundance evaluation is the prerequisite for coalmine water inflow prediction and water disaster prevention. Luohe aquifer is the roof of No.4 coal seam on panel 41 in Wenjiapo mine. Six main controlling factors of Luohe aquifer chosen to assess coal water abundance are aquifer thickness, porosity, moisture content, washing liquid consumption and apparent resistivity of upper and lower Luohe Formation. Analytic hierarchy process(AHP) has been used to determine the weight of each control factor. Based on ArcGIS numerical visualization platform, the vector maps of factors are normalized and superimposed, and then water abundance evaluation model of aquifer based …
Fuzzy Random Optimization Of Generalized Kelvin Constitutive Model For Creep Of Artificial Freezing Clay, Yao Yafeng, Cheng Hua, Rong Chuanxin, Zhang Nan, Lin Jian
Fuzzy Random Optimization Of Generalized Kelvin Constitutive Model For Creep Of Artificial Freezing Clay, Yao Yafeng, Cheng Hua, Rong Chuanxin, Zhang Nan, Lin Jian
Coal Geology & Exploration
The constitutive model of freezing creep is one of the important reference data for shaft building using freezing method. Uniaxial creep tests under different stress levels were conducted for the artificial freezing clay at -5℃, -10℃, -15℃ and -20℃. So the changing rules of creep curves were obtained under the condition of different temperatures and different stress levels. On this basis, traditional Guess-Newton algorithm has been improved by fuzzy random iterative search and the of the fuzzy random Guess-Newton algorithm steps were obtained, then we use the improved algorithm to optimize the parameters of the generalized Kelvin constructive model, obtained …
Clgis Logging Data Format Conversion, Lin Jiamin, Zhang Gong
Clgis Logging Data Format Conversion, Lin Jiamin, Zhang Gong
Coal Geology & Exploration
In order to solve the problem of DAT log data format conversion, well logging data of CLGIS(Coalfield Logging Geology Interpretation System) is analyzed in detail. On the basis of analysis of the data storage format, format conversion program is written. The program can accurately convert the DAT format data to LAS format data promptly. The LAS format data can be loaded into the commonly used well logging software in oil field easily. With the help of powerful software, the drawing efficiency and quality of coalfield well logging is greatly improved.
Mechanical Characteristics And Test Of Rotary Drilling Of Pdc Anchor Bit, Zhang Youzhen, Zhang Ning, Zhang Xianzhen
Mechanical Characteristics And Test Of Rotary Drilling Of Pdc Anchor Bit, Zhang Youzhen, Zhang Ning, Zhang Xianzhen
Coal Geology & Exploration
For the construction requirements of the fast and accurate drilling of anchor hole in a coal roadway, the main mechanical factors are analyzed in theory through the establishment of PDC anchor bit rotary drilling mechanics model. The results show that the axial force of the PDC cutting tooth increases with the increase of the penetration depth, and shows the trend of first decreasing and then increasing with the increase of the cutting angle. When the friction coefficient of the coal-bearing strata is 0.20 to 0.43, the optimum cutting angle is from 15.0° to 18.3°, and the axial force and the …
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
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, Liao Jiangnan, Jiang Nan, Song Haitao, Dong Hongbo, Ma Bin
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, Weng Yinsheng, Wu Di, Lu Feifei, Wang Longpeng
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, Zhang Yingjie, Zhao Yongzhe, Yang Zhong, Mo Haitao
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, Han Lei, Qin Yong, Wang Zuotang
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 …