Applicability Evaluation Technology Of Perforating Parameters In Different Reservoirs,
2023
College of Petroleum Engineering, Xi’an Shiyou University, Xi’an 710065, China; Shaanxi Key Laboratory of Well Stability and Fluid & Rock Mechanics in Oil and Gas Reservoirs, Xi’an 710065, China
Applicability Evaluation Technology Of Perforating Parameters In Different Reservoirs, Bi Gang, Wu Jiemin, Yang Shangyu, Li Mengmeng, Han Fei, Wang Xin, Cui Ying
Coal Geology & Exploration
Perforating parameters have an important impact on the productivity of oil and gas wells. Currently, the optimization of perforating parameters is mostly based on single factor analysis, with no multi-factor comprehensive evaluation analysis performed. In this paper, the finite element simulation method was used to analyze and study the influence law of perforating parameters on wellhead flow under different reservoir conditions. Firstly, a geometric model of pressure drop in reservoir with perforation completion was established to simulate the fluid flow after perforation. In this way, the influence laws of perforating parameters, anisotropy parameters and natural fracture parameters on the pressure …
Construction And Restoration Technology Of Terrain Remodeling Layer In The Restoration Of Ecological Geological Layer In Open-Pit Mining Areas,
2023
Carbon Neutral Research Institute, China Administration of Coal Geology, Beijing 100039, China
Construction And Restoration Technology Of Terrain Remodeling Layer In The Restoration Of Ecological Geological Layer In Open-Pit Mining Areas, Zhao Xin, Wang Tong, Li Congcong, Lin Zhongyue, Li Fei, Wang Weichao, Feng Kangning, Yin Yalei, Jiang Zhe
Coal Geology & Exploration
Mining can easily result in a series of change in the geomorphic form, such as irregular mining pits, high and steep slopes, slag hills, primitive soil failure and accumulated water in mining pits in the plateau and alpine mining area, which is in disharmony with the surrounding environment. Such changes of geomorphic form will not only adversely affect the surface ecological environment, but also bring different degrees of influence and damage to the shallow groundwater seepage field and the permafrost. In particular, the geological hazards and disasters such as landslides and collapses may even be resulted in. In response to …
Uav Aerial Triangulation: Point Error Distributions And The Influencing Mechanisms Of Ground Control Points On Its Accuracy,
2023
Key Laboratory of Land Environment and Disaster Monitoring, Ministry of Natural Resources, Xuzhou 221116, China
Uav Aerial Triangulation: Point Error Distributions And The Influencing Mechanisms Of Ground Control Points On Its Accuracy, Zha Jianfeng, Zhu Pengcheng, Wu Dejun, Ma Chenyang, Zhong Chongwu, Yin Hongwu, Wang Dong
Coal Geology & Exploration
Unmanned aerial vehicles (UAVs) have been an important means of monitoring the surface deformation in mining areas since they are flexible, are insensitive to weather, and can swiftly acquire images of target areas. However, there is an urgent need to improve UAV-based measurement accuracy. Based on a systematic analysis of factors affecting the accuracy of surface measurement points, this study focuses on the influence of the quality of ground control points on the point error distribution and accuracy of aerial triangulation. Firstly, through a large number of repeated observations and experiments, this study investigated the error distributions of the planar …
Research Advances On The Techno-Economic Evaluation Of Ucg Projects,
2023
Coal Mine Exploration Bureau of Guizhou Province, Guiyang 550025, China
Research Advances On The Techno-Economic Evaluation Of Ucg Projects, Yi Tongsheng, Qin Yong, Zhou Yongfeng, Wang Lingxia, Jin Jun, Zhou Ze
Coal Geology & Exploration
Underground coal gasification (UCG) is driven by China's development strategy for a clean and efficient coal energy structure. Its industrialization prospect depends on the economic and social benefits of UCG projects. Against this background, this study reviews the research advances on the economic evaluation of UCG projects at home and abroad and summarizes the current insights into the economic competitiveness of UCG projects. Through case analysis, it presents a basic model for the economic evaluation of the UCG-combined-cycle gas turbine (CCGT) - carbon capture and storage (UCG-CCGT-CCS) system and the main understanding of the model. Furthermore, this study discusses the …
Ucg Industrialization In The Soviet Union: History And Comments,
2023
Guizhou Youchi Energy Technology Co., Ltd., Guiyang 550014, China; China University of Mining and Technology, Xuzhou 221116, China
Ucg Industrialization In The Soviet Union: History And Comments, Kong Weimin, Zhou Yongfeng, Yi Tongsheng, Li Ping, Qin Yong, Zhou Ze
Coal Geology & Exploration
China's energy resources are originally poor in oil and gas but rich in coal. The industrialization of underground coal gasification (UCG) technologies, which is an important way of achieving a low-carbon and efficient coal energy structure in China, contributes to the smooth achievement of the peak carbon dioxide emissions and carbon neutrality in China. This study reviews the history of the field tests and industrialization of UCG technologies in the Soviet Union by systematically referencing and sorting literature, aiming to provide a reference for the present development and industrialization of UCG technologies in China. The results show that the development …
Ucg Pilot Tests In The United States And Their Contributions To Modern Ucg Technologies,
2023
Guizhou Youchi Energy Technology Co., Ltd., Guiyang 550014, China; China University of Mining and Technology, Xuzhou 221116, China
Ucg Pilot Tests In The United States And Their Contributions To Modern Ucg Technologies, Huang Wan, Wang Jun, Wang Lingxia, Yi Tongsheng, Chen Kexin, Qin Yong
Coal Geology & Exploration
The industrialization of underground coal gasification (UCG), which is conducive to the transformation and development of the coal energy structure and the improvement in the low-carbon utilization level of coal resources, is an environmentally friendly energy development technology in line with the sustainable development strategy. The international energy crisis from the 1980s to the 1990s prompted the United States to vigorously develop UCG technologies. Accordingly, this country has successively carried out six series of UCG pilot tests, which contribute greatly to the progress in UCG technologies and provided the critical foundation for the formation of modern UCG technologies worldwide. This …
Ucg Pilot Tests In Eu Countries: A Review Of History And Progress,
2023
Guizhou Youchi Energy Technology Co., Ltd., Guiyang 550014, China; Guizhou Provincial Coalfield Geology Bureau, Guiyang 550081, China
Ucg Pilot Tests In Eu Countries: A Review Of History And Progress, Jin Lili, Yang Lei, Wu Yarong, Wang Xiaofang, Yi Tongsheng, Qin Yong
Coal Geology & Exploration
Underground coal gasification (UCG) is an important way of transforming China’s coal energy structure. European Union (EU) countries explored UCG for over 80 years, and their rich experience can be used as a reference for promoting UCG industrialization in China. The UK prepared for UCG pilot tests for the first time in the world. From 1944 to 2014, based on the experience of the former Soviet Union and the United States, EU countries successively implemented at least 12 UCG pilot test projects in three stages, making important contributions to the progress in UCG technologies. They invented the blind-hole method and …
Ucg Engineering Demonstrations In Australia: History And Its Implications,
2023
Guizhou Youchi Energy Technology Co., Ltd., Guiyang 550014, China; Guizhou Provincial Coalfield Geology Bureau, Guiyang 550081, China
Ucg Engineering Demonstrations In Australia: History And Its Implications, Zhou Ze, Wang Lingxia, Qin Yong, Jin Jun, Yang Lei, Yi Tongsheng
Coal Geology & Exploration
Underground coal gasification (UCG), which is a revolutionary coal mining technology, is an important direction for achieving a low-carbon and efficient coal energy structure in China and is also a potential explorable way to ensure the smooth realization of the peak carbon dioxide emissions and carbon neutrality in China. Based on a literature survey, this study sorts out the exploration process of UCG technologies in Australia and analyzes the gains and losses using field test cases. The experience in UCG technologies in Australia can provide a reference for the development of the technologies in China. The results show that the …
A New Type Of Ordovician Limestone Karst Water Inrush From The Floor Of Old Goaf: Formation Mechanism And The Prevention And Control Technology,
2023
Xin’an Mine, Jizhong Energy Fengfeng Group Co., Ltd., Handan 056200, China
A New Type Of Ordovician Limestone Karst Water Inrush From The Floor Of Old Goaf: Formation Mechanism And The Prevention And Control Technology, Zhou Shuai, Li Shuqian, Yin Shangxian, Liang Manyu, Meng Haopeng, Qi Rongrong, Li Yuanyuan
Coal Geology & Exploration
The Ordovician limestone water inrush accident occurred in the small coal-pit area in Xin’an Mine of Hebei Fengfeng mining area on October 25th, which resulted in the production level being flooded, with the coal mine shut-down. Specifically, the accident cause was analyzed, and the concept of Ordovician limestone karst water inrush from the floor of old goaf was proposed, with its difference from the connotation and denotation of water inrush from the old goaf or floor water inrush accidents induced by mining summarized. Then, the water inrush mechanism based on the dynamic evolution of stored energy release from …
Research And Application Of Fracture Mechanics Model Of Stope Roof Under The Coupling Of Direct Roof And Basic Roof,
2023
College of Architecture and Civil Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
Research And Application Of Fracture Mechanics Model Of Stope Roof Under The Coupling Of Direct Roof And Basic Roof, Li Jinhua, Zheng Chengxian, Gu Shuancheng, Wu Baolin, Wang Xiong, Song Yongjun
Coal Geology & Exploration
Periodic weighting is a typical characteristic of mine pressure. Accurate prediction of stope periodic weighting step is an important way to effectively reduce the occurrence of stope accidents. Aiming at the influence of the coupling between the basic roof defects and the direct roof on the periodic weighting step, the stope roof was regarded as a finite plate model with cracks. According to the coordinate deformation mechanism of the overburden rock, the fracture mechanics model of the stope roof was established based on the fracture mechanics theory. On this basis, the periodic weighting step function under the coupling between the …
Material Point Method-Based Simulation And Dynamic Characteristic Analysis Of Instability-Induced Landslide Movement: A Case Study Of The Yanguan Landslide In The Three Gorges Reservoir Area,
2023
Hubei Key Laboratory of Disaster Prevention and Mitigation, China Three Gorges University, Yichang 443002, China; National Field Observation and Research Station of Landslides in Three Gorges Reservoir Area of Yangtze River, China Three Gorges University, Yichang 443002, China
Material Point Method-Based Simulation And Dynamic Characteristic Analysis Of Instability-Induced Landslide Movement: A Case Study Of The Yanguan Landslide In The Three Gorges Reservoir Area, Song Kun, Ruan Di, Lyu Honglin, Han Luyang, Huang Haifeng
Coal Geology & Exploration
The dynamic process and influence range of instability-induced landslide movement have important effects on the risk area division and prevention of landslide hazards. To accurately and systematically analyze the changes in the dynamic characteristics of landsides during their instability-induced movement, this study thoroughly investigated and analyzed the instability-induced movement process of the Yanguan landslide in the Three Gorges Reservoir area, Zigui County, Hubei Province. Through laboratory ring shear tests, this study determined the changing pattern of residual strength and the motion parameters of sliding zone soil under different shear rates. Accordingly, using the material point method (MPM), which is suitable …
Detection Of Near-Surface Cavities Using The 2d Multi-Parameter Full-Waveform Inversion Of Rayleigh Waves,
2023
School of Geological Engineering and Geomatics, Chang’an University, Xi’an 710054, China; Key Laboratory of Western China’s Mineral Resources and Geological Engineering, Ministry of Education, Chang’an University, Xi’an 710054, China
Detection Of Near-Surface Cavities Using The 2d Multi-Parameter Full-Waveform Inversion Of Rayleigh Waves, Li Yu, Wang Jingqi, Guan Jianbo, Yan Yingwei
Coal Geology & Exploration
The accurate detection of near-surface low-velocity anomalies (such as cavities), which has always been a valuable and challenging research topic in the field of geophysics, holds great significance for the fine-scale near-surface modeling in urban disaster assessment and the seismic exploration of coalfields under complex conditions. The full-waveform inversion (FWI) of surface waves is suitable for high-precision near-surface modeling. However, there still exist many urgent problems with the modeling in practical applications. To solve the key issues of the FWI of surface waves, such as multi-parameter crosstalk, actual data preprocessing, and source wavelet estimation, this study developed a complete method …
A Method For Suppressing Casing Coupling Noise In Vsp Data Based On Morphological Component Analysis Of Characteristic Waves,
2023
Institute of Geophysics, Research Institute of Exploration and Development, Xinjiang Oil Field Branch Company, China National Petroleum Corp., Urumchi 830013, China
A Method For Suppressing Casing Coupling Noise In Vsp Data Based On Morphological Component Analysis Of Characteristic Waves, Pan Long, Mao Haibo, Jiang Li, Hu Keyang, Dang Zhimin, Chen Wenchao
Coal Geology & Exploration
During the acquisition of vertical seismic profile (VSP) data, coupling noise between casing strings frequently emerges due to poor well cementing or the presence of cement annulus between multiple casing layers. This type of noise features high energy, a wide spatial influence range, and slow attenuation. Furthermore, it overlaps effective signals in multiple domains, such as the time and frequency domains. Therefore, casing coupling noise severely affects the signal-to-noise ratio of VSP data. This study first introduces the basic theory of Morphological Component Analysis (MCA). Then, it conducts a comparative analysis of the distribution of effective signals and casing coupling …
Influence Of High In-Situ Stress Areas In The Coal Seam Roofs On Microseism-Based Tomographic Inversion,
2023
Institute of Resources & Environment, Henan Polytechnic University, Jiaozuo 454000, China
Influence Of High In-Situ Stress Areas In The Coal Seam Roofs On Microseism-Based Tomographic Inversion, Liu Kaihang, Feng Lei, Yun Meihou, Cao Yunxing, Tian Lin
Coal Geology & Exploration
High in-situ stress areas in the coal seam roofs are prone to induce mine dynamic hazard such as rock bursts. To meet the demand for safe coal mining, this study achieved real-time monitoring and swift early warning of high in situ stress areas. Specifically, based on data transmitted from microseismic stations in real time, this study conducted the inversion of the wave velocities in coal seams and rocks using a fast three-dimensional (3D) tomographic inversion algorithm. The accuracy of tomographic inversion results directly determines the judgment on the locations of high in situ stress areas. Therefore, by building a 3D …
Table Of Contents,
2023
China Coal Technology and Engineering Group (CCTEG)
Propagation Of Hydraulic Fractures In Thin Interbedded Tight Sandstones,
2023
China United Coalbed Methane Corp. Ltd., Beijing 100016, China
Propagation Of Hydraulic Fractures In Thin Interbedded Tight Sandstones, Yang Fan, Mei Wenbo, Li Liang, Sun Zening, An Qi, Yang Qi, Lu Meiquan, Yang Ruiyue
Coal Geology & Exploration
Thin interbedded tight sandstone reservoirs are characterized by strong vertical heterogeneity due to the superimposed pattern of the deposited sandstones and mudstones. As a result, hydraulic fractures are difficult to propagate vertically to effectively connect the reservoirs. Given this, ascertaining the vertical propagation patterns of hydraulic fractures in thin interbeds is of great significance for the development of thin interbedded tight sandstones. With the thin interbedded tight sandstone reservoirs of the lower Shihezi Formation in the Linxing block, Ordos Basin as a case study, this study built the fracture propagation model of these sandstones. Accordingly, it analyzed the effects of …
Iron Occurrence In Coal Measures And Its Release Mechanism During Water-Rock Interactions: Taking A Mine In The Eastern Grassland As An Example,
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
Iron Occurrence In Coal Measures And Its Release Mechanism During Water-Rock Interactions: Taking A Mine In The Eastern Grassland As An Example, Wang Tiantian
Coal Geology & Exploration
The mine water with iron out of limit corrodes the water distribution pipeline and the industrial equipment, thereby damaging the liver of human body, and further threatening the human health. The enrichment or dilution of iron in mine water is determined by the iron content and its occurrence in coal measures, as well as its release mechanism during water-coal and water-rock interactions. Herein, 18 groups of coal and rock samples were collected from a mine in the eastern grassland, and had the iron content, occurrence and carrier in the coal measure analyzed with an inductively coupled plasma mass spectrometry (ICP-MS), …
Influence Of Cutting Parameters On The Performance Of Plough During Hard Rock Cutting In Coal Mining,
2023
Department of Mining Engineering, Indian Institute of Technology Kharagpur, West Bengal - 721302, India
Influence Of Cutting Parameters On The Performance Of Plough During Hard Rock Cutting In Coal Mining, Sathish Kumar Palaniappan, Moganapriya Chinnasamy, Samir Kumar Pal, Rajasekar Rathanasamy
Journal of Sustainable Mining
Coal ploughs have proved very successful on many faces in various parts of the world. Recently, there has been a general tendency in longwall working to increase the speed at which the machine progresses along the coal face. An increase in production rate demands enhances either due to depth of penetration or cutting speed. This, in turn, results in increasing power demand and also the force acting on an individual pick. To get maximum efficiency from a cutting machine, a number of parameters need to be investigated. The first and foremost thing of interest is naturally the pick geometry. The …
Geophysical Imprint Of Mining-Induced Rock Mass Deformation In The Area Of Construction Disaster In Bytom (Poland),
2023
Central Mining Institute, Plac Gwarków 1, 40-166 Katowice, Poland
Geophysical Imprint Of Mining-Induced Rock Mass Deformation In The Area Of Construction Disaster In Bytom (Poland), Andrzej Kotyrba, Łukasz Kortas
Journal of Sustainable Mining
The paper presents the analysis of the results of geophysical surveys conducted in the mining area located in Bytom – Karb (USCB, Poland) in the aspect of identifying the causes of significant damage to the complex of inhabited tenement houses which occurred in 2011. The surveys were carried out by microgravimetric and GPR methods. The construction disaster was caused by the exploitation of one of the hard coal seams at a depth of about 800 m along the mining longwall running underneath the settlement. The terrain deformation parameters exceeded the forecasted values, and in several places discontinuities took linear forms …
Controls On The Stratiform Copper Mineralization In The Western Syncline, Upper Peninsula, Michigan,
2023
Metallorum LLC
Controls On The Stratiform Copper Mineralization In The Western Syncline, Upper Peninsula, Michigan, William C. Williams, Theodore J. Bornhorst
Michigan Tech Publications
The Western Syncline hosts reduced-facies, or Kupferschiefer-type, sedimentary rock-hosted stratiform Cu deposits (SSC) in the lowermost meters of the Nonesuch Formation, which is part of a thick section of clastic sedimentary rocks that comprise the upper fill of the Mesoproterozoic Midcontinent Rift of North America. Located in the Porcupine Mountains Cu district in Upper Peninsula, Michigan, these blind deposits were discovered in 1956, but are not yet developed, although recent renewed interest may result in near-term production. The deposits are distinguished by their relatively undeformed nature and lack of superposed hydrothermal events. Prior to lithification, chalcocite mineralization replaced diagenetic pyrite …
