Experimental Study On Dynamic Prediction Of Coal Seam Floor Elevation In Heading Face,
2021
Xi'an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi'an 710077, China
Experimental Study On Dynamic Prediction Of Coal Seam Floor Elevation In Heading Face, Liu Wenming, Cheng Jianyuan, Liu Zaibin, Zhang Zeyu
Coal Geology & Exploration
Speedy drivage urgently needs to build a high-precision two-dimensional geological model. Taking the XY-S working face of Qinshui coalfield as an example, based on the results of 3D seismic interpretation, the coal seam floor elevation measured during excavation is used to update in succession the 3D seismic average velocity field and the coal seam floor elevation ahead, thus the prediction accuracy ahead of heading is analyzed statistically. The results show that the error between the predicted coal seam floor profile and the actual exposed profile decreases gradually by constantly making use of the measured coal seam floor elevation, upgrading the …
Research Progress Of Drilling And Borehole Completion Technologies In Broken Soft Coal Seam In Underground Coal Mine,
2021
China Coal Research Institute, Beijing 100013, China; Xi'an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi'an 710077, China
Research Progress Of Drilling And Borehole Completion Technologies In Broken Soft Coal Seam In Underground Coal Mine, Wang Li, Yao Ningping, Yao Yafeng, Wang Yi, Zhang Jie, Fang Jun, Wei Hongchao
Coal Geology & Exploration
In China, broken soft coal seams are in many strata and widely distributed. It is generally characterized by complex tectonic stress, high gas pressure, low mechanical strength and poor permeability, therefor, the hole is easy to collapse, outburst, which will probably cause many problems such as drilling difficulties, frequent accidents in the hole, inadequate hole depth, borehole blockage, drainage blind area and so on. With the continuous increase of coal mining depth, it is more difficult for drilling and completion in broken soft coal seam. Therefore, the high efficiency, deep hole and precise drilling technology, as well as the completion …
Table Of Contents,
2021
China Coal Technology and Engineering Group (CCTEG)
The Evolution Difference Of Macromolecular Structures And Its Dynamic Mechanism Of Coal Macerals：Research Status And Prospect,
2021
State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology(Beijing), Beijing 100083, China; College of Geoscience and Surveying Engineering, China University of Mining and Technology(Beijing), Beijing 100083, China
The Evolution Difference Of Macromolecular Structures And Its Dynamic Mechanism Of Coal Macerals：Research Status And Prospect, Cao Daiyong, Wei Yingchun, Wang Anmin, Wang Lu, Liu Zhifei, Qin Rongfang, Shu Zhenyu, Chen Gaojian
Coal Geology & Exploration
The physical and chemical properties of macerals are important factors affecting the clean and efficient utilization of coal and the physical properties of coal reservoirs. It has been recognized that the essential cause of determining the properties of macerals lies in their macromolecular structure. In order to reveal the evolution characteristics of macromolecular structure of macerals and its controlling factors, the research progresses at home and abroad were summarized and the shortcomings were analyzed from several aspects, such as the chemical and physical structure of macromolecules, the tectonic stress effect on the macromolecular evolution, and the evolution characteristics of macromolecules …
Review On Carbon Neutralization Associated With Coal Geology,
2021
Low Carbon Energy Institute, China University of Mining and Technology, Xuzhou 221008, China; School of Resource and Earth Sciences, China University of Mining and Technology, Xuzhou 221116, China; Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process of the Ministry of Education, China University of Mining and Technology, Xuzhou 221008, China
Review On Carbon Neutralization Associated With Coal Geology, Sang Shuxun, Wang Ran, Zhou Xiaozhi, Huang Huazhou, Liu Shiqi, Han Sijie
Coal Geology & Exploration
Coal-based carbon emissions constitute the largest part of China's total carbon emissions. Reducing coal-based carbon emissions and realizing the efficient, clean and low-carbon utilization of coal are the important ways to achieve the goal of "carbon neutralization". This paper systematically reviews the research fields of coal geology related to carbon neutralization, analyzes the role and application prospects of coal geology in carbon neutrality research and engineering practice, and discusses the development direction of coal geology in the context of carbon neutralization. The following understandings are obtained. Promoting clean coal geology research to advance the efficient and clean combustion of coal. …
Technologies And Prospect Of Geological Guarantee For Intelligent Coal Mining,
2021
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
Technologies And Prospect Of Geological Guarantee For Intelligent Coal Mining, Dong Shuning, Liu Zaibin, Cheng Jianyuan, Chen Baohui, Dai Zhenhua, Li Dan
Coal Geology & Exploration
Intelligent coal mining is the strategic selection of the coal industry under the new round of technological change. It is the way that must get through to achieve efficient production of coal mine safety. Geological guarantee technologies can provide accurate and reliable geological data for intelligent coal mining. Moreover, it could reduce the occurrence of coal mine production disasters and accidents by effectively detecting hidden geological factors. The development process of coal geological guarantee technologies in China is systematically expatiated, from serving for resource exploration, high-yield and efficient mine construction to serving for safe and efficient production of coal mines, …
Chemical Compositions And Technological Properties Of Low-Rank Coals In The South Shenfu Mining Area: Characteristics, Relationship And Practice,
2021
College of Geology and Environment, Xi'an University of Science and Technology, Xi'an 710054, China; Shaanxi Provincial Key Laboratory of Geological Support for Coal Green Exploitation, Xi'an 710054, China; Geological Research Institute for Coal Green Mining, Xi'an University of Science and Technology, Xi'an 710054, China; Center for Post-doctoral Studies of Geological Resources and Geological Engineering, Xi'an University of Science and Technology, Xi'an 710054, China
Chemical Compositions And Technological Properties Of Low-Rank Coals In The South Shenfu Mining Area: Characteristics, Relationship And Practice, Guo Chen, Wang Shengquan, Shi Qingmin, Qiao Junwei, Li Huantong, Zhang Weiguo, Li Jun, Zhang Chi, Wang Xiaokang, Du Fangpeng
Coal Geology & Exploration
Coal grading utilization is an essential way to fit its high-efficiency, clean and green development trends. Understanding the basic chemical composition and key technological properties of coal is the basis for achieving grading and qualitative utilization of coal resources. The South Shenfu mining area in Shaanxi Province is rich in coal reserves and it is an important low-rank coal production base in West China. However, it has not been able to achieve the qualitative utilization of coal practically completely for a long time, which restricts the full play of the value of coal resources and the further improvement of coal …
The Characteristics Of Pore Structure And Gas Adsorption For Water-Immersion Coal After Drying,
2021
School of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China; State Key Laboratory Cultivation Base for Gas Geology and Gas Control, Henan Polytechnic University, Jiaozuo 454003, China; State Collaborative Innovation Center of Coal Work Safety and Clean-efficiency Utilization, Henan Polytechnic University, Jiaozuo 454003, China
The Characteristics Of Pore Structure And Gas Adsorption For Water-Immersion Coal After Drying, Si Leilei, Xi Yujun, Wang Hongyang, Wen Zhihui, Wei [email protected] Jianping
Coal Geology & Exploration
In order to investigate the characteristics of pore structure and methane adsorption for water-immersion coal after drying, two coal samples with different ranks were soaked in distilled water for a long time(60 d). Then, the low-temperature N2 adsorption experiments and CO2 adsorption experiments were carried out to investigate the changing rules of pore structure for coal before and after water immersion, and the high-pressure capacity method was used to test the characteristics of methane adsorption. Results showed that the pore volume and specific surface area of coal decreased after water immersion. According to the results of low-temperature N …
Numerical Analysis On Csw Fracturing Behavior Of Coal Seam Under Constraint Of Geological And Engineering Conditions,
2021
Key Laboratory of CBM Resources and Reservoiring Process, China; University of Mining and Technology, Xuzhou 221008, China
Numerical Analysis On Csw Fracturing Behavior Of Coal Seam Under Constraint Of Geological And Engineering Conditions, Qin Yong, Li Hengle, Zhang Yongmin, Zhao Youzhi, Zhao Jincheng, Qiu Aici
Coal Geology & Exploration
As a revolutionary technology for rock stratum reformation, the controllable shock wave(CSW) fracturing technology has achieved remarkable effect in coal seam reconstruction, and application exploration in the field of coal safety mining has been carried out. However, the previous understanding of the basic CWS fracturing rules under the constraints of geological engineering factors is insufficient due to the limitation of experimental and field monitoring conditions, which restricts the exploration of the fracturing mechanism and the optimization of the field operation parameters. In view of this, based on the description of CSW coal seam reformation and its engineering scientific problems, the …
Study On Density Of The Supercritical Methane,
2021
School of Resources and Environment, Henan Polytechnic University, Jiaozuo 454003, China; Collaborative Innovation Center of Coalbed Methane and Shale Gas for Central Plains Economic Region, Jiaozuo 454003, China
Study On Density Of The Supercritical Methane, Zhang Xinbin, Song Dangyu, Li Yunbo, Qi Yong'an, Fan Shunli
Coal Geology & Exploration
The density of supercritical methane is not only an important parameter for calculation of unconventional natural gas resources and adsorption capacity of methane in coal, but also a main indicator for measurement of the diffusion efficiency of supercritical methane and the ability to dissolve organic matter. Through analysis and comparison of the applicability of various gas state equations, it is realized that the Helmholtz energy state equation can accurately calculate the density of methane under the conditions of 0-30 MPa and 270-360 K. A calculation program for methane density was written using Microsoft Office Excel, and the error was less …
Effects Of Alternating Stress On Casing Damage Mechanism,
2021
College of Safety and Ocean Engineering, China University of Petroleum(Beijing), Beijing 102249, China
Effects Of Alternating Stress On Casing Damage Mechanism, An Fengchen, Zhang Feiyang, Yi Hao, Zhang Sui'an
Coal Geology & Exploration
Horizontal well staged fracturing technology of horizontal well has been widely used in the exploitation of low-permeability oil and gas reservoirs and coalbed methane, and has achieved good economic results. However, the vertical section of the casing is found to be damaged with serious deformation in the process of multi-stage hydraulic fracturing, which will prevent bridge plugs from being installed at the preferred design depths, thereby resulting in abandonment of all remaining fracturing stages. In this study, a user element is developed to simulate the mechanical behavior at the casing-cement sheath interface under cyclic loads. The developed element is then …
Micro-Pore Structure And Fractal Characteristics Of Terrestrial Shales: A Case Study Of Shahezi Formation In Xujiaweizi Fault Depression,
2021
School of Geoscience, China University of Petroleum(East China), Qingdao 266580, China
Micro-Pore Structure And Fractal Characteristics Of Terrestrial Shales: A Case Study Of Shahezi Formation In Xujiaweizi Fault Depression, Lin Zizhi, Lu Shuangfang, Chang Xiangchun, Li Junqian, Zhang Pengfei, Zhou Nengwu, Zhang Yu, Wang Junjie, Huang Hongsheng
Coal Geology & Exploration
The pore structure and fractal characteristics of shale are analyzed, and their impacting factors are also revealed using the low temperature nitrogen adsorption-desorption method, combined with scanning electron microscopy, C-S analysis and XRD. The results showed that the mineral compositions of Shahezi Formation continental shales were dominated by clay minerals, quartz and feldspar. The pore types in shales were mainly clay mineral intragranular pores, feldspar dissolution pores and grain edge pore, while the organic pores were not developed. The adsorption isotherms of shales belonged to the type Ⅳ isotherm according to the IUPAC, which develop two types of hysteresis loop, …
Framework On Intelligent Decision Support System For Coal Seam Floor Water Hazard Prevention And Control,
2021
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;
Framework On Intelligent Decision Support System For Coal Seam Floor Water Hazard Prevention And Control, Jin Dewu, Li Peng
Coal Geology & Exploration
Coal floor water inrush is a common type of water disaster in the production process of coal mines in North China coalfield. In order to solve the scientific decision making problem of water hazard prevention and control engineering and further improve the reliability of the relevant projects, this paper puts forward a technical idea of establishing an intelligent decision support system(IDSS). The IDSS is a combination of the traditional decision support system(DSS) and artificial intelligence. On the basis of analyzing the functional requirements of DSS for water hazard prevention and control, an integrated design process of "data-model-solution" is proposed, and …
Deep Mining Under Safe Water Pressure Of Aquifer: Inheritance And Innovation,
2021
Hebei State Key Laboratory of Mine Disaster Prevention, North China Institute of Science and Technology, Beijing 101601, China
Deep Mining Under Safe Water Pressure Of Aquifer: Inheritance And Innovation, Yin Shangxian, Lian Huiqing, Xu Bin, Tian Wuzi, Cao Min, Yao Hui, Meng Haopeng
Coal Geology & Exploration
The paper reviews the development course of inheritance and innovation of mining under pressure, expounds the concept and the necessary and sufficient conditions of mining under pressure, and on the basis of the connotation of mining under pressure, the base level of erosion is defined as the boundary(interface) of shallow and deep mining under pressure. The paper clarified that mining above confined water is mining under pressure, while mining under aquifer does not belong to the category, and corrects the improper expression of roof and floor pressure in "Coal Mine Safety Regulations". This paper summarizes the theory and technology directly …
Design And Implementation Of Mine Water Hazard Monitoring And Early Warning Platform,
2021
School of Safety Engineering, North China Institute of Science and Technology, Beijing 101601, China
Design And Implementation Of Mine Water Hazard Monitoring And Early Warning Platform, Lian Huiqing, Xu Bin, Tian Zhentao, Liu Demin, Yang Yi, Pan Guangyi, Wang Rui
Coal Geology & Exploration
Any mine water hazard will show different omens. In order to consolidate the foundation of intelligent early warning of water disaster, the connotation of system construction of perception, identification, evaluation, prediction and the interlogical relation are clarified. The mechanism of water inrush is varred for different types of water hazards, we designed three types of multi-mode water inrush typical scenarios and established the corresponding water inrush criteria. In addition, so we proposed two kinds of forecasting methods, namely the precise prediction of deterministic theory and the non-deterministic trend projections including big data and deep learning, which laid a solid theoretical …
Investigation And Simutation On The Model And Prevention Technology Of Water Inrush From Roof Bed Separation,
2021
Key Laboratory of Mining Disaster Prevention and Control, Shandong University of Science and Technology, Qingdao 266590, China; National Experimental Teaching Demonstration Center for Mining Engineering, Shandong University of Science and Technology, Qingdao 266590, China
Investigation And Simutation On The Model And Prevention Technology Of Water Inrush From Roof Bed Separation, Zhang Wenquan, Wang Zaiyong, Wu Xintao, Shao Jianli, Lei Yu, Wu Xunan
Coal Geology & Exploration
In order to prevent water inrush from roof separation, a partial backfill scheme is proposed for simulation study. First of all, based on the existing data, many kinds of separation water inrush accidents occurred in China were summarized and analyzed, and the disaster model of separation water accumulation was studied deeply. Then, taking the separation water accident of 1307 working face in the first mining area of a mine in Shaanxi Province as an example, the hydrogeological conditions and the relationship between upper aquifer and separation water inrush were analyzed, and the development characteristics of roof separation space of working …
Experiment Investigation On The Influence Of Mixing Effect On Dispersion Scale Dependence,
2021
College of Construction Engineering, Jilin University, Changchun 130026, China
Experiment Investigation On The Influence Of Mixing Effect On Dispersion Scale Dependence, Ma Ziqi, Dai Zhenxue, Dong Shuning, Wang Hao, Liu Xiaoqian
Coal Geology & Exploration
Dispersivity, a property parameter defined to characterize the degree of dispersion and mixing, is crucial for the prediction and remediation of groundwater contamination. However, in field tracer tests, the real mixing effect has often been ignored. In this paper, an aquifer with horizontal layered structure was simulated by laboratory experiments. Three kinds of media were chosen to reconstructed experimental aquifer. Two monitoring methods, buried sensor and sensor in the well, were adopted to compare the difference of breakthrough curves, so as to investigate the influence of mixing effect in the well on the dispersion scale dependence. The results showed that …
Mechanism Of Water Rock Interaction In Coal Measure Sandstone Aquifer Disturbed By Grouting Engineering: A Case Study Of Taoyuan Coal Mine,
2021
National Engineering Research Center of Coal Mine Water Hazard Controlling, School of Resources and Civil Engineering, Suzhou University, Suzhou 234000, China; College of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China
Mechanism Of Water Rock Interaction In Coal Measure Sandstone Aquifer Disturbed By Grouting Engineering: A Case Study Of Taoyuan Coal Mine, Guo Yan, Gui Herong, Wei Jiuchuan, Ni Jianming, Cheng Rongfa, Pang Yingchun, Zhang Zhi, Hong Huang, Hu Mancong, Cui Yali, Liang Zhan, Li Jun, Chen Jiayu, Li Chen
Coal Geology & Exploration
Coal measure sandstone fissure water is one of the important water filling sources in coal mine. This paper takes the Permian coal measures in Taoyuan Coal Mine of Huaibei Coalfield as the research object. Based on the analysis of the water chemical characteristics of coal measures since the grouting treatment of water disaster in the mine, the mechanism of hydrogeochemical action of groundwater and its controlling factors were expounded. The results show that during the grouting treatment project, the main cation in coal measures water was Na+, and the main anion was SO42-; the relationship …
Unsupervised Noise Suppression Method For Depth Network Seismic Data Based On Prior Information Constraint,
2021
School of Information and Communication Engineering, Xi'an Jiaotong University, Xi'an 710049, China
Unsupervised Noise Suppression Method For Depth Network Seismic Data Based On Prior Information Constraint, Chen Wenchao, Liu Dawei, Wei Xinjian, Wang Xiaokai, Chen Dewu, Li Shuping, Li Dong
Coal Geology & Exploration
Seismic data processing is a critical step in seismic exploration. Due to the complexity of underground structure and surface conditions, seismic data processing needs to go through a series of complex processes, thus forming various types of seismic data. Different types of seismic data have different data characteristics. Exploring and making full use of the data characteristics can not only give full play to the technical potential of processing methods, eliminate the influence of various non-geological factors on the quality of seismic data processing, but also enhance the reliability of seismic data processing. Improving the signal-to-noise ratio and resolution of …
Design And Analysis Of Hole-Forming Technology For Surface Large Diameter Emergency Rescue Borehole,
2021
China Coal Research Institute, Beijing 100013, China; Xi'an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi'an 710077, China
Design And Analysis Of Hole-Forming Technology For Surface Large Diameter Emergency Rescue Borehole, Hao Shijun, Mo Haitao
Coal Geology & Exploration
Surface large diameter borehole can be used as the escape channel for trapped people underground, and it is one of the important emergency rescue plans when mine accidents cause people trapped underground. However, the conventional large-diameter engineering hole is mainly formed by mud positive circulation and multi-stage reaming, which can not meet the rescue requirements. Focusing on the purpose of rescue and escape of large-diameter hole, this paper expounds the hole forming technology design principles including accurate connecting roadway, optimization of borehole structure, high-efficiency hole forming and safety connecting roadway. According to the specific construction conditions of overburden drilling, second …
