Design And Application Of Anti-Drop Drill Pipe With Fracture Self-Locking Function,
2023
CCTEG Xi’an Research Institute (Group) Co., Ltd., Xi’an 710077, China
Design And Application Of Anti-Drop Drill Pipe With Fracture Self-Locking Function, Dong Changle
Coal Geology & Exploration
Drill pipe will inevitably break and drop during its long-term service, which not only seriously affects the drilling efficiency and the rate of hole formation, but also brings great economic losses to coal mines. In terms of drill pipe drop caused by the random fracture during drilling, the shortcomings of fishing tap were pointed out. By analyzing the fracture characteristics of drill pipe, it is concluded that the key to solve the problem of drill pipe drop is to develop the axial connection technology after the fracture of pin joint. Herein, an active anti-drop technology with fracture self-locking function was …
Experimental Study On Co2 Storage In Coal Measure Gas Hydrates Reservoirs In Muli Coalfield,
2023
CCTEG Xi’an Research Institute (Group) Co., Ltd., Xi’an 710077, China; Shaanxi Key Laboratory of Prevention and Control Technology for Coal Mine Water Hazard, Xi’an 710077, China; College of Energy Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
Experimental Study On Co2 Storage In Coal Measure Gas Hydrates Reservoirs In Muli Coalfield, Lyu Wenyu, Lyu Chao, Zhang Wenzhong, Sun Qiang, Jia Hailiang, Tang Li'an
Coal Geology & Exploration
Carbon Dioxide Geological Storage (CGS) is a promising technology for reducing the greenhouse gas emissions and mitigating the climate change. The hydrate-based CO2 storage in the abandoned gas hydrate reservoir can play a key role in CGS. In this paper, artificial cores of hydrate reservoir were prepared based on the basic physical properties of coal measure gas hydrate reservoir in Muli Coalfield, and the variations in density, porosity and permeability of the core with particle diameter of quartz sand were analyzed. The variations in CO2 hydrate saturation in core were analyzed based on the low-field Nuclear Magnetic Resonance …
Numerical Simulations Of The Rapid Interception Mechanisms By The Borehole-Controlled Grouting With Grout-Conserving Bags Under Flowing Water,
2023
CCTEG Xi’an Research Institute (Group) Co., Ltd., Xi’an 710077, China; Shaanxi Key Lab of Mine Water Hazard Prevention and Control, Xi’an 710077, China
Numerical Simulations Of The Rapid Interception Mechanisms By The Borehole-Controlled Grouting With Grout-Conserving Bags Under Flowing Water, Yang Zhibin
Coal Geology & Exploration
Grout-conserving bags. To characterize the local and overall development processes of the rapid interception more subtly and vividly, this study built a CFD-DEM fluid-solid coupling mathematical model of the roadway inlet under the given water head boundary according to the principle of a constant velocity. Then, given constant velocities of water inrush volumes of 2000 m3/h and 20000 m3/h, this study numerically simulated the construction process of water-blocking bodies by pouring and stacking aggregates with a grain size of 22 mm under the operating conditions with or without grout-conserving bags. The results show that: (1) Under …
Deep Seismic Reflection Profiling Technology In Land Areas: A Review And Prospects,
2023
Center for Geophysical Survey, China Geological Survey, Langfang 065000, China; Institute of Geophysical and Geochemical Exploration, Chinese Academy of Geological Sciences, Langfang 065000, China; National Center for Geological Exploration Technology, Langfang 065000, China; School of Geophysics and Information Technology, China University of Geosciences (Beijing), Beijing 100083, China; Liaoning Institute of Geology and Mineral Resources Co., Ltd., Shenyang 110032, China
Deep Seismic Reflection Profiling Technology In Land Areas: A Review And Prospects, Yue Hangyu, Wang Xiaojiang, Wang Lei, Wang Kai, Zhang Baowei
Coal Geology & Exploration
Deep seismic reflection profiling has been internationally proven to be a leading technology for deep earth exploration. With longer arrangement and greater energy than those used in oil seismic exploration, this technology can detect the fine-scaled structures and tectonic features from the earth surface to the upper mantle. Therefore, it is widely applied to the detection of continental and marine crust and upper mantle, with fruitful achievements having been made in revealing deep earth dynamic processes, expounding on the geotectonic evolution, determining the basin-mountain coupling, inferring the metallogenic and reservoir formation conditions, and analyzing earthquake disasters. This paper systematically reviews …
Balance Analysis And Counterweight Optimization Design For Detection With Orientated Borehole Ground Penetrating Radar Antenna,
2023
School of Mechanical and Electronic Engineering, Pingxiang University, Pingxiang 337055, China
Balance Analysis And Counterweight Optimization Design For Detection With Orientated Borehole Ground Penetrating Radar Antenna, Li Taotao, Xu Xianlei, Xu Hailong, Ouyang Bing, Wang Pengjie
Coal Geology & Exploration
Orientated borehole ground penetrating radar (OBGPR) can effectively solve the problem of orientated and detailed detection of geological conditions around the mine or oil well boreholes and engineering probe hole, etc. In view of difficult state control and unsatisfactory detection effect during antenna sagging due to the changeable medium in deep hole and the unreasonable counterweight of OBGPR antenna, the balance analysis and counterweight optimization design of orientated borehole ground penetrating radar antenna during detection was implemented in this paper. Firstly, analysis was conducted on the force of OBGPR antenna under the balance condition during the deep hole and well …
Direct Current Resistivity Method For The Advance Prediction Of Water Hazards In Coal Mines Based On An Artificial Neural Network,
2023
China Coal Research Institute, Beijing 100013, China; CCTEG Xi’an Research Institute (Group) Co., Ltd., Xi’an 710077, China
Direct Current Resistivity Method For The Advance Prediction Of Water Hazards In Coal Mines Based On An Artificial Neural Network, Li Yuteng, Cheng Jianyuan, Lu Jingjin, Dai Fengqiang, Wu Zhengfei, Fang Zhe, Zhao Jiajia
Coal Geology & Exploration
The mine Direct Current (DC) resistivity method has the characteristics of high construction efficiency and low cost, which is widely used in the advanced detection of water hazards in coal mine heading face.With the continuous deepening of applications, higher requirements have been put forward for the advanced detection signal processing method of mine DC resistivity method. Based on the response information database obtained by finite element method and data reconstruction, the Levenberg-Marquardt (L-M) artificial neural network method is used to realize the advanced prediction of mine DC resistivity method. First, this study established an advanced prediction model of the DC …
An Experimental Study On Factors Controlling The Proppant Transport In Hydraulic Fractures Of Coal Reservoirs,
2023
Institute of Resources & Environment, Henan Polytechnic University, Jiaozuo 454003, China; Unconventional Gas Research Institute, Henan Polytechnic University, Jiaozuo 454003, China; School of Earth Resources, China University of Geosciences (Wuhan), Wuhan 430074, China; Collaborative Innovation Center of Coalbed Methane and Shale Gas for Central Plains Economic Region, Jiaozuo 454003, China
An Experimental Study On Factors Controlling The Proppant Transport In Hydraulic Fractures Of Coal Reservoirs, Su Xianbo, Fan Jian, Wang Ran, Wang Lufei, Zhao Fengzhen, Wang Qian
Coal Geology & Exploration
Effectively propping open hydraulic fractures in coal reservoirs plays an important role in ensuring the efficient production of coalbed methane (CBM). This study investigated the effects of fracture morphology and the volume, injection rate, and properties of fracturing fluids on proppant transport in fractures through visualized experiments. The results are as follows: (1) Proppants showed a relatively homogeneous distribution in simple fractures with a constant aperture. In contrast, they form room-and-pillar props composed of proppant pillars and proppant-free rooms in local simple fractures with varying apertures and reticular fractures due to the effects of the varying flow rates of fracturing …
Soil Moisture Migration Mechanism And Its Ecological Effect In Cold And Arid Open-Pit Coal Mining Area,
2023
CCTEG Xi’an Research Institute (Group) Co., Ltd., Xi’an 710077, China; Shaanxi Engineering Research Center of Mine Ecological Environment Protection and Restoration in the Middle of Yellow River Basin, Xi’an 710077, China; China Coal Research Institute, Beijing 100013, China
Soil Moisture Migration Mechanism And Its Ecological Effect In Cold And Arid Open-Pit Coal Mining Area, Wang Qiangmin, Zhao Chunhu, Wang Hao, Sun Jie, Yang Jian, Wang Wenke
Coal Geology & Exploration
In order to explore the soil moisture migration mechanism and its ecological effect in the cold and arid open-pit coal mining area, a long-term in-situ test was carried out to observe the soil moisture, taking the open-pit coal mine in eastern Mongolia grassland area as the study area. The results show that: The shallow soil moisture content is mainly affected by rainfall in non-freezing period, while the soil moisture content is significantly affected by soil temperature in freezing period. Besides, the saturated permeability coefficient of soil in depth less than 50 cm is greater than 150 cm/d, but that of …
Design, Development And Implementation Of A Comprehensive Evaluation System For Multi-Source Information On Water Inrush From Coal Seam Floor,
2023
CCTEG Xi’an Research Institute (Group) Co., Ltd., Xi’an 710077, China; Shaanxi Key Laboratory of Prevention and Control Technology for Coal Mine Water Hazard, Xi’an 710077, China; Key Laboratory of Karst Geological Resources and Environment, Ministry of Education, Guizhou University, Guiyang 550025, China; College of Resources and Environmental Engineering, Guizhou University, Guiyang 550025, China
Design, Development And Implementation Of A Comprehensive Evaluation System For Multi-Source Information On Water Inrush From Coal Seam Floor, Li Bo, Luo Yulan, Fan Juan, Guo Xiaoming, Li Menghua
Coal Geology & Exploration
The evaluation technology of multi-source information fusion is an important method for the prediction of water inrush from the coal seam floor. However, this method has the deficiencies, such as high professional technical requirements, complicated and tedious evaluation process, and insufficient intelligence during its application. In this study, the design principle, design idea, development mode, and development method of a multi-source information comprehensive evaluation system for water inrush from coal seam bottom were systematically described according to the characteristics of the technical process of water inrush risk evaluation. The key functions of system were built, including the universal evaluation index …
Mine Water Inrush Prediction Method Based On Vmd-Dbn Model,
2023
CCTEG Xi’an Research Institute (Group) Co., Ltd., Xi’an 710077, China; Shaanxi Key Laboratory of Prevention and Control Technology for Coal Mine Water Hazard, Xi’an 710077, China; Faculty of Engineering, China University of Geosciences (Wuhan), Wuhan 430074, China
Mine Water Inrush Prediction Method Based On Vmd-Dbn Model, Liu Hui, Liu Guiqin, Ning Dianyan, Fan Juan, Chen Weiming
Coal Geology & Exploration
In the process of coal mining, the loss of people and property caused by mine water inrush is extremely serious. To prevent the occurrence of water inrush accidents and grasp the law of change of water inrush, the water inrush prediction and forecasting, especially the accurate estimation of mine water inrush, is very important, which is also an important task in the prevention and control of mine water damage. To increase the prediction accuracy of mine water inrush, an efficient time series prediction model combining Variational Mode Decomposition (VMD) and Deep Belief Network (DBN) was proposed for the series of …
Numerical Simulation Of Grout Diffusion Under Coal Seam Floor And Analysis Of Influencing Factors,
2023
CCTEG Xi’an Research Institute (Group) Co., Ltd., Xi’an 710077, China; Shaanxi Key Laboratory of Prevention and Control Technology for Coal Mine Water Hazard, Xi’an 710077, China; National Coal Mine Water Hazard Prevention Engineering Technology Research Center, Suzhou University, Suzhou 234000, China; School of Earth and Space Sciences, University of Science and Technology of China, Hefei 232000, China
Numerical Simulation Of Grout Diffusion Under Coal Seam Floor And Analysis Of Influencing Factors, Guo Yan, Gui Herong, Wei Jiuchuan, Hong Huang, Guo Xiangdong, Cui Yali, Ye Shuang, Li Jun
Coal Geology & Exploration
Ground high-pressure advanced regional grouting has become the preferred engineering method for the prevention and control of water disasters in coal mines. The diffusion mechanism of grout has received widespread attention, and the design of branch hole spacing mostly relies on the on-site experience, which has a certain degree of blindness and restricts the effectiveness and efficiency of the project. Based on the actual working conditions of grouting site in Hengyuan Coal Mine, Huaibei Coalfield, the numerical simulation was performed with the COMSOL Multiphysics software for the high-pressure grout diffusion in the floor area of the ground directional drilling coal …
Design And Application Of The 3d Model Interfaces Of The Integrated Intelligent Mine Control Platform,
2023
Tiandi (Changzhou) Automation Co., Ltd., Changzhou 213015, China
Design And Application Of The 3d Model Interfaces Of The Integrated Intelligent Mine Control Platform, Zhang Jing
Coal Geology & Exploration
The production safety control platform for mines is used to present information on the centralized scheduling, real-time monitoring, risk prevention and control, operation and maintenance detection, and decision analysis of various equipment and automated, intelligent production systems for tunneling, mining, machinery, transportation, and ventilation during coal mine production. Accordingly, the interface design of the integrated intelligent mine control platform is particularly important for user experience. However, the current integrated automation systems for mines adopt monochrome configuration engineering plans and display a single interface effect of display and operation. By introducing the industrial design concepts and employing the 3D model interface …
Influence Of Water Yield Property Of Yan’An Formation Aquifer On Water Yield Of Mines In Southern Shenmu-Fugu Mining Area,
2023
School of Water and Environment, Chang’an University, Xi’an 710054, China; Key Laboratory of Subsurface Hydrology and Ecological Effect in Arid Region of Ministry of Education, Chang’an University, Xi’an 710054, China; Key Laboratory of Eco-hydrology and Water Security in Arid and Semi-arid Regions of the Ministry of Water Resources, Chang’an University, Xi’an 710054, China; Engineering Research Center of Groundwater and Eco-Environment of Shaanxi Province, Xi’an 710054, China; Shaanxi Province “Four Main Bodies-joint” School Enterprise Joint Research Center for Mine Ecological Geological Environment Protection and Restoration in the Middle Reaches of the Yellow River, Xi’an 710077, China
Influence Of Water Yield Property Of Yan’An Formation Aquifer On Water Yield Of Mines In Southern Shenmu-Fugu Mining Area, Li Shu, Yang Zeyuan, Ma Xiongde, Liu Shengzu, Fang Chujing, Zhang Aoqi
Coal Geology & Exploration
Aiming at the large difference of water yield of different mine fields in Yushenfu mining area, based on a large amount of drilling, pumping test data collected in the area, from the weathering and denudation, burning effect, discontinuous distribution regions of aquifuges, microscopic pore structure, the influencing factors of water yield property of Yan’an Formation aquifer(YFA) are analyzed. Combined with the height of the water-conducting fissure zones, the influence of water yield property of YFA on water yield of mines is discussed. The results show that weathering and denudation cause the sandstone of Yan’an Formation to develop fissures and be …
A Method For Predicting Fractures In Carbonate Reservoirs Based On Fracture Identification-Sensitive Log-Seismic Parameter Model,
2023
School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China; Haiyang Oil Production Plant, Shengli Oilfield Sub-Company, SINOPEC, Dongying 257237, China
A Method For Predicting Fractures In Carbonate Reservoirs Based On Fracture Identification-Sensitive Log-Seismic Parameter Model, Wang Zhiwei, Zhang Kai, Wu Qunhu, Zhang Benhua, Yu Shina, Zhang Zunxiang, Wu Yanjia
Coal Geology & Exploration
Carbonate reservoirs show fractures and strong heterogeneity, leading to limited applications of a single logging or seismic method in fracture identification. Therefore, this study proposed a method for predicting fractures in carbonate reservoirs based on a fracture identification-sensitive log-seismic parameter (FISLSP) model, and the details are as follows: (1) Based on petrophysical analysis results, as well as formation micro-imaging (FMI) logs and the interpretations of fractures at well locations, this study established a segmental fracture identification-sensitive parameter (FISP) model for fractures at well locations; (2) Using the optimal seismic attributes of near-well seismic traces determined based on the high-quality fractured …
Application And Prospect Of Acoustic Detection In The Mining Sector,
2023
College of Safety Science and Engineering, Xi’an University of Science and Technology, Xi’an 710054, China; Shaanxi Key Laboratory of Prevention and Control of Coal Fire, Xi’an 710054, China
Application And Prospect Of Acoustic Detection In The Mining Sector, Deng Jun, Wang Jinrui, Ren Shuaijing, He Qian, Wang Caiping, Qu Gaoyang
Coal Geology & Exploration
Acoustic detection for mines is a geophysical prospecting technique for mine information detection based on acoustic methods. Compared with other detection methods, acoustic detection has the advantages of wide applicability, high reliability, and low economic investment. This paper reviews the development of acoustic detection technology in the mine field and sorts out and expounds on the research progress and technical characteristics of this technology in detecting basic physical information inside mines and geological information outside mines. Furthermore, this study investigates the detection mechanisms, implementation methods, and applicable scenarios of this technology in determining the object states in the field of …
Study On Modification Of Plant Gum Flushing Fluid In Coal-Bearing Strata And Its Mechanism,
2023
State Key Laboralory of Geohazard Prevention and Geoenvironment Protection, Chengdu 610059, China
Study On Modification Of Plant Gum Flushing Fluid In Coal-Bearing Strata And Its Mechanism, Xie Chengchao, Wang Sheng, Yan Peng, Chen Liyi, Li Bingle, Zhang Jie
Coal Geology & Exploration
To improve the adverse effects of the depletion of plant gum resources on the application of flushing fluid in complex strata such as coal-bearing strata, a study was conducted on the compound and crosslinking modification of guar gum. A new type of plant gum flushing fluid (GXB) was developed using xanthan gum as the compound synergist and organic boron as the crosslinking modifier, with cross-linking control agent and inorganic treatment agent as the supplementary. Meanwhile, a series of performance evaluation was carried out. The evaluation results show that GXB has excellent performance and can meet the requirements of drilling in …
Effects Of Increasing Sintering Pressure On The Performance Of Impregnated Diamond Bit,
2023
School of Mechanical Engineering and Electronic Information, China University of Geosciences (Wuhan), Wuhan 430074, China
Effects Of Increasing Sintering Pressure On The Performance Of Impregnated Diamond Bit, Yang Zhan, Tan Songcheng, Fang Xiaohong, Yang Kaihua
Coal Geology & Exploration
The matrix formulas of conventional hot-pressed impregnated diamond bits are mostly elemental metal systems, using WC or YG8 as the skeleton materials, Cu alloys as the bonding materials, and Ni, Co, Fe and Mn as the intermediate materials. Due to the compositions and contents of the bonding and skeleton materials in the formulas, the suitable sintering pressure is limited (≤16 MPa), while the sintering temperature is relatively high (≥ 930℃), resulting in a lower relative ratio of the actual and theoretical densities (≤98%) for the diamond bit matrix. However, the high sintering temperature will cause thermal damage to the diamonds, …
Uav-Based Quantification Of Dynamic Lahar Channel Morphology At Volcán De Fuego, Guatemala,
2023
Boise State University
Uav-Based Quantification Of Dynamic Lahar Channel Morphology At Volcán De Fuego, Guatemala, Jerry C. Mock, Jeffrey B. Johnson, Armando Pineda, Gustavo Bejar, Amilcar Roca
Michigan Tech Publications
This study quantified erosional and depositional processes for secondary lahars in Las Lajas drainage at Volcán de Fuego, Guatemala, during the rainy season from May to October 2021. Abundant pyroclastic material from ongoing eruptive activity is remobilized seasonally during heavy precipitation, which can impact infrastructure and populations living near Fuego. Our region of focus was in an agricultural zone 6 to 10 km from the summit, surveyed with an unoccupied aerial vehicle (UAV) quadcopter at monthly intervals. Imagery was processed into overlapping time-lapse structure from motion digital elevation models (DEMs). DEMs were differenced to find volumetric changes as a function …
Research On Stability Of Rock Mass And +30 Level Surface Construction Works When Re-Exploiting The Seam H10 At Mong Duong Coal Mine, Vietnam,
2023
Hanoi University of Mining and Geology, Vietnam, Faculty of Mining, Department of Underground Mining
Research On Stability Of Rock Mass And +30 Level Surface Construction Works When Re-Exploiting The Seam H10 At Mong Duong Coal Mine, Vietnam, Tien Trung Vu, Doan Viet Dao
Journal of Sustainable Mining
The re-exploitation of coal seams located near the ground is one of the solutions to increase output, reduce mining investment costs, and avoid wasting coal resources. The re-exploitation of coal seams will also cause instability of the surrounding rock mass and may affect surface construction works. Through the process of re-exploiting the longwall in seam H10 at Mong Duong Coal Mine, the authors have studied and evaluated the stability of the rock mass and +30 level surface works (including fan station and gateroad). To achieve the results in this study, the numerical simulation model method and the analytical method were …
Evaluating The Post-Mining Land Uses Of Former Mine Sites For Sustainable Purposes In South Africa,
2023
University of Venda, Department of Earth Science, South Africa
Evaluating The Post-Mining Land Uses Of Former Mine Sites For Sustainable Purposes In South Africa, Sphiwe E Mhlongo
Journal of Sustainable Mining
This paper uses a case study of an abandoned magnesite mine in the Limpopo Province of South Africa to find ways of identifying post-mining land used from the current uses of the abandoned mine sites or features. The approach used involved carrying out a field characterization of the mine site and documentation of the current uses of the features of the abandoned mine site. The technique used to identify the internal and external factors of the land uses involved analyzing their Strength, Weakness, Opportunities, and Threats. The Analytic Hierarchy Process (AHP) technique was used for further ranking of the land …
