Development Of High Temperature Borehole Inclinometer,
2019
School of Information Engineering, Sichuan Tourism University, Chengdu 610100, China
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 …
Application Of Wire Line Coring Technique In Overburden Drilling,
2019
Research Institute No. 240, CNNC, Shenyang 110032, China
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 …
Table Of Contents,
2019
China Coal Technology and Engineering Group (CCTEG)
The Development Of Seismic-While-Mining Detection Technology In Underground Coal Mines,
2019
Xi'an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi'an 710077, China
The Development Of Seismic-While-Mining Detection Technology In Underground Coal Mines, Cheng Jianyuan, Qin Si, Lu Bin, Wang Baoli, Wang Ji
Coal Geology & Exploration
The explosive source of underground seismic exploration in coal mines is greatly affected by the control of pyrotechnics and cannot realize the monitoring and early warning of dynamic geological disasters in coal mining. Seismic-while-mining(SWM) is a new technique based on shearer as a seismic source underground. The paper reviewed the research status of SWM technique at home and abroad, introduced the SWM's principle and its unique advantages. According to some pilot experiments of SWM, the results show that the shearer can be used as a seismic source because it has the character of strong excitation energy, wide frequency band, safety, …
Method Of Transparent Working Face Based On Dynamic Detection Of Cross Hole Seismic Subdivision,
2019
Xi'an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi'an 710077, China
Method Of Transparent Working Face Based On Dynamic Detection Of Cross Hole Seismic Subdivision, Lu Bin
Coal Geology & Exploration
Transparent working surface is an important part of intelligent coal mining. It provides detailed geological structure information of working face for intelligent coal mining. This paper proposes a working surface exploration method based on segmented and dynamic cross-hole seismic, which can realize progressive fine detection of coal working face. The method is a new development with seismic while mining, which is using the coal cutter as seismic source. The main idea is to image the working face segmented by deploying some detectors in a series of horizontal holes parallel to the long wall. The method performs fine imaging on the …
Simulation Of Seismic-While-Mining With Shearer As Source Of Fully Mechanized Mining Face,
2019
Xi'an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi'an 710077, China
Simulation Of Seismic-While-Mining With Shearer As Source Of Fully Mechanized Mining Face, Jin Dan
Coal Geology & Exploration
In order to analyze the wave field characteristics of seismic-while-mining data excited by coal cutter as seismic source, forward simulation was used to calculate seismic data. We transform the cutting mode of spiral drum and the stress of drum into the force function of seismic source, which is added to the wave equation in the form of load distribution at different time and location. Wave equation is solved by high-order staggered-style finite difference method. Finally, the seismic data obtained by numerical simulation show that shear wave energy is very strong and press wave energy is very weak in the wave …
Geological Evaluation Model For Site Selection Of Underground Coal Gasification Without Well In Jinghai Coal-Bearing Area, Tianjin, China,
2019
North China Geological Exploration Bureau of Tianjin, Tianjin 300170, China
Geological Evaluation Model For Site Selection Of Underground Coal Gasification Without Well In Jinghai Coal-Bearing Area, Tianjin, China, Wang Zhigang, Fu Xiaojin, Liang Jie, Cao Jian, Jiang Shengguo
Coal Geology & Exploration
Based on the 4 factors such as exploration status, coal seam, coal quality and hydrological conditions, using the secondary fuzzy comprehensive evaluation method, the geological evaluation model without well was built. In order to verify the applicability of the model, the material balance by law of conservation of mass was carried out and the results compared with the test results of indoor model was got. This research suggests that the weight of geological conditions affecting underground coal gasification without well is exploration status > conditions of coal seam > hydrological conditions > coal quality, the area with comprehensive score higher than 70 is …
Study On The Biodegradation Of Guanidine Gum By Methanogens In Coal Seam,
2019
School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China
Study On The Biodegradation Of Guanidine Gum By Methanogens In Coal Seam, Li Yunsong, Guo Hongyu, Fu Chaoyong, Zhao Guojun, Xia Daping
Coal Geology & Exploration
The problem of low temperature breaking of guanidine gum fracturing fluid is related to the effect of coal seam penetration. In order to explore the effect of methanogenson the biodegradation of guanidine gum, Inner Mongolia some coal mine lignite were collected to prepare samples of coal samples, and the enriched fresh mine water was used as the bacteria source. The biological methane metabolism experiments of guanidine gum + coal were used to characterize the biodegradability of methanogens to guanidine gum, with the total gas production, CH4 concentration, guanidine gum molecular functional groups and C and H elements content changes. …
Productivity Prediction Of Hypotonic Cbm Test Well In Jiaozuo Mining Area Under Hydraulic Fracturing,
2019
College of Environmental and Hydraulic Engineering, Zhengzhou University, Zhengzhou 450001, China
Productivity Prediction Of Hypotonic Cbm Test Well In Jiaozuo Mining Area Under Hydraulic Fracturing, Wang Zhirong, Yang Jie, Chen Lingxia, Guo Zhiwei
Coal Geology & Exploration
In order to explore the permeable mechanism and the output law after fracturing of CBM in the "three soft" coal seam(soft coal, soft roof and soft bottom) of Jiaozuo under hydraulic fracturing, Based on the permeable model of reservoir fracture, considering the influence of fracture porosity on permeability after fracturing, a reservoir fracture penetration model was established, the application and analysis of the test well was carried out to obtain the characteristics of pressure cracks such as length, width, permeability and reservoir parameters after fracturing. Through the comprehensive analysis of isothermal adsorption curves and historical fitting, the recovery rate of …
Simulation And Test Of Enhancement Of Gas Drainage Through Co2 Injection Into Coal Seam Of Low Permeability,
2019
College of Safety Science & Engineering, Liaoning Technical University, Fuxin 123000, China; Key Laboratory of Mine Thermodynamic Disasters & Control of Ministry of Education, Fuxin 123000, China
Simulation And Test Of Enhancement Of Gas Drainage Through Co2 Injection Into Coal Seam Of Low Permeability, Bai Gang, Zhou Xihua, Wei Shiping, Fan Chaojun, Li Xueming
Coal Geology & Exploration
In view of the difficulty of gas extraction and low drainage efficiency in coal seam of low permeability, based on multi component gas competitive adsorption of CO2-CH4, simulation and test for improving seam gas extraction rate through CO2 injecting CO2 into coal seam were carried out. A fluid-solid coupling model considering gas-water phases and Klinkenberg effect of CO2 injection into coal seam for enhancement of gas drainage was established, parameters of gas pressure, gas content and gas extraction rate after coal seam CO2 injection were analyzed by using COMSOL software and applied …
Genesis And Geochemical Characteristics Of Coalbed Methane From Taiyuan Formation In Sijiazhuang Mine Field Of Yangquan Mining Area,
2019
Shanxi Lanyan CBM Group Co., Ltd, Jincheng 048204, China
Genesis And Geochemical Characteristics Of Coalbed Methane From Taiyuan Formation In Sijiazhuang Mine Field Of Yangquan Mining Area, Yu Zhenfeng, Hao Chunsheng, Yang Changyong, Yao Jinbao, Wang Wei, Ji Changjiang
Coal Geology & Exploration
In order to study the geochemical characteristics and the genesis of CBM of Sijiazhuang mine field in Yangquan mining area, the in-site desorption test of coal core samples from the main gas-producing seams(seams 8, 9 and 15) from Permo-Carboniferous Taiyuan Formation was carried out systematically, gas samples were collected to conduct component and carbon isotope analysis. The results indicated that the gas content of seam 8 was higher than that of seam 9, on the plan the gas content of seam 15 was uneven, in some parts there was almost no gas. During the whole desorption, the gas component content …
Effects Of Pressure Drop Funnels Model Of Different Shapes On Cbm Well Productivity,
2019
Guizhou Research Center of Shale Gas and CBM Engineering Technology, Guiyang 550081, China
Effects Of Pressure Drop Funnels Model Of Different Shapes On Cbm Well Productivity, Hu Haiyang, Jin Jun, Zhao Lingyun, Chen Jie, Gu Jiaoyang
Coal Geology & Exploration
In order to study the effect of pressure drop funnel shapes on CBM well productivity, the change law of pressure and the shape of pressure drop funnel in different drainage stages of CBM wells were discussed, the mathematical models of pressure drop funnel were established, the concept of "desorption coefficient" and "effective desorption coefficient" for coal reservoir were proposed to quantitative study desorption effect of the coal reservoir. Taking a CBM well in the west of Guizhou as an example, the research results show that the logarithmic function model of pressure distribution of radial flow is difficult to accurately reflect …
Formation Mechanism Of Coal Seam Aquifer And Water Hazard Control Technology,
2019
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
Formation Mechanism Of Coal Seam Aquifer And Water Hazard Control Technology, Wang Hao
Coal Geology & Exploration
Coal seams occur in Peat formation formed by sediments, often used as aquiclude or aquitard in coal production. However, in Barapukuria coal mine in Bangladesh, No.VI coal seam is rich in water, shows a typical hydrogeological phenomenon that the coal seam becomes an aquifer, which is rare in coal mining process both in China and abroad. From the formation mechanism of coal and the microstructure and tectonic development characteristics of coal, the structure of rich in water of coal was revealed. Based on MTS815 rock mechanics test system, the permeability of No.VI coal was tested, and the internal structure of …
Water Yield Analysis Of Underground Drainage Boreholes On The Basis Of Logarithmic Normal Distribution,
2019
School of Environmental Science and Engineering, Chang'an University, Xi'an 710054, Chinaa; Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region(Chang'an University), Ministry of Education, Xi'an 710054, China
Water Yield Analysis Of Underground Drainage Boreholes On The Basis Of Logarithmic Normal Distribution, Ma Lianjing, Zhao Baofeng
Coal Geology & Exploration
In order to analyze the distribution rule of water flow from underground drainage borehole in coal mines, histogram, Q-Q chart and nonparametric tests were used to test the logarithmic normal distribution model for water flow from underground drainage borehole in typical working face, and the nonlinear regression model was fitted. Combined with hydrogeological conditions, the parameters in the model were analyzed. The result shows that water flow from underground drainage boreholes in working face obeys the lognormal distritution. The logarithmic mean and standard deviation of water flow from drainage borehole of typical working face have a positive linear dependence relation …
Prediction Of The Height Of Water Flowing Fractured Zone Under Subcritical Mining Based On Dimensional Analysis,
2019
School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China
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,
2019
System Engineering Institute, Liaoning Technical University, Huludao 125105, China
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. …
Comparison Of Dissolution Characteristics Of Organic Matter In Coal Gangue Of Different Geological Time,
2019
Department of Resource & Environmental Engineering, Henan Polytechnic University, Jiaozuo 454000, China; Key Laboratory of Mine Geological Hazards Mechanism and Control, Xi'an 710054, China; Collaborative Innovation Center of Coalbed Methane and Shale Gas for Central Plains Economic Region, Jiaozuo 454000, China
Comparison Of Dissolution Characteristics Of Organic Matter In Coal Gangue Of Different Geological Time, Sun Yanfang, Zhao Li, Luo Shaohe, Zhang Lei, Sun Chao, Li Bowen
Coal Geology & Exploration
Taken the unweathered coal gangues obtained from the Jurassic coalbed of Bulianta mine and the Car-boniferous-Permian coalbed of Baode mine located in Shendong mining area as the research subjects, the dissolution characteristics of organic matter in two kinds of coal gangues were studied comparatively through soaking experiments, and combined with three-dimensional fluorescence spectrometry and parallel factor analysis. It is significant for the underground reservoir to study mechanism of water treatment in coal mining areas. These results indicate that the total ion concentration in DOM sample of coal gangue of Bulianta mine is higher than that of Baode mine due to …
Effect Of Clay Content On Shear Strength Of Loess,
2019
Key Laboratory of Mine Geological Hazards Mechanism and Control, Xi'an 710054, China; School of Geological Engineering and Geomatics, Chang'an University, Xi'an 710054, China
Effect Of Clay Content On Shear Strength Of Loess, Wang Li, Li Xi'an, Hong Bo, Du Shaoshao, Zhang Hangbo, Zhao Ning
Coal Geology & Exploration
The experimental research about effect of different clay content on shear strength of loess was carried out to reveal the influence of clay content on shear strength and its microscopic mechanism, and then a scientific basis for engineering practice of loess was provided. Self-made wet sieve device under negative pressure was applied to screen loess samples with different clay content. Different clay content of the loess samples were made to the same dry density, but with different moisture content using static pressure method, and then were taken direct shear test. The results show that with the increase of moisture content, …
Feasibility Test Of Roof Resistivity Monitoring For Super-High Mining Face,
2019
Xi'an Research Institute Co. Ltd., China Coal Techonogy and Engieering Group Corp., Xi'an 710077, China
Feasibility Test Of Roof Resistivity Monitoring For Super-High Mining Face, Lu Jingjin, Li Deshan, Wang Bingchun
Coal Geology & Exploration
The failure of roof overburden is one of the main reasons for water inrush in mining working face. Roof resistivity monitoring by mine electrical method can be used to detect overburden failure dynamically. However, roof resistivity monitoring for super-high mining face has many problems, such as audio electromagnetic signal by conventional methods is difficult to penetrate through wide working face, burying of roof monitoring electrodes is difficult, monitoring electrode in the roof of air return lane is hard to protect, and so on. In order to solving these problems, feasibility study of roof resistivity monitoring for super-high mining face is …
Experimental Study On The Influence Of Well Inclination Angle Of Coalbed Methane Well On The Cementation Strength Of Cement-Formation Interface,
2019
Faculty of Earth Resources, China University of Geosciences(Wuhan), Wuhan 430074, China
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 …
