High-Pressure Jet Disturbance Grouting Technology For Water And Sand Inrush In Roadway Tunneling And Its Application,
2022
Xi’an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi’an 710077, China; Shaanxi Key Laboratory of Preventing and Controlling Technology for Coal Mine Water Hazard, Xi’an 710077, China
High-Pressure Jet Disturbance Grouting Technology For Water And Sand Inrush In Roadway Tunneling And Its Application, Zhao Baofeng, Zhu Mingcheng, Li Debin
Coal Geology & Exploration
In order to control the water and sand inrush in roadway tunneling under weak consolidated formation conditions, taking water and sand inrush during the No.2 coal seam roadway tunneling in Maiduoshan Coal Mine of Ningdong Coalfield as the research object, the problems of large amount of engineering, long period of surface treatment and high risk of underground treatment were solved. The construction of the blocking body at the water and sand inrush point was completed by using the water-retaining wall construction technology, high-pressure jet disturbance grouting technology, the integration of drilling and grouting technology, and the pressure control and slurry …
Influence Of Fracture Types Of Main Roof On The Stability Of Surrounding Rock Of The Gob-Side Coal-Rock Roadway In Inclined Coal Seams And Its Engineering Application,
2022
Mining College, Guizhou University, Guiyang 550025, China; Research Center of Roadway Support and Disaster Prevention Engineering in Coal Industry, China University of Mining and Technology (Beijing), Beijing 100083, China; National & Local Joint Laboratory of Engineering for Effective Utilization of Regional Mineral Resources from Karst Areas, Guizhou University, Guiyang 550025, China; Guizhou Engineering Center for Safe Mining Technology Under Complex Geologic Condition, Guizhou University, Guiyang 550025, China
Influence Of Fracture Types Of Main Roof On The Stability Of Surrounding Rock Of The Gob-Side Coal-Rock Roadway In Inclined Coal Seams And Its Engineering Application, Gao Lin, Liu Pengze, Zhang Pandong, Wu Guiyi, Kang Xiangtao
Coal Geology & Exploration
Due to the asymmetry and heterogeneity of surrounding rock structure, the surrounding rock of the gob-side coal-rock roadway in inclined coal seams presents more serious deformation and failure under the influence of driving and mining. To reveal the influence of different main roof fracture types on the stability of surrounding rock of the gob-side coal-rock roadway in inclined coal seams, the deformation characteristics of surrounding rock under four main roof fracture types of this kind of roadway are studied by numerical simulation. The results show that the influence degree from highest to lowest of the position of the fracture line …
Research On Dynamic Response Characteristics Of Typical Ground Fissure Sites In Hebei Plain,
2022
School of Geological Engineering and Geomatics, Chang’an University, Xi’an 710054, China
Research On Dynamic Response Characteristics Of Typical Ground Fissure Sites In Hebei Plain, Cui Siying, Deng Yahong, Cao Ge, Yu Shuangrui, Mu Huandong, Li Yanjie
Coal Geology & Exploration
Ground fissures in the Hebei Plain are widely distributed and cause severe disasters, seriously impacting local engineering construction and people’s life. The research on ground fissures in the Hebei Plain focuses mainly on the development characteristics, genesis mechanism, and distribution. However, there is little research on the dynamic characteristics of the site in this area. In order to study the influence of ground fissures on the dynamic response of the site in the Hebei Plain, this study conducted microtremor testing on typical earth fissures caused by tectonics, earthquakes, and ancient rivers. It determined the dynamic response characteristics of earth fissure …
Typical Characteristics Of Geological Hazards And Ecological Environment Of Coal Base In The Bends Area Of The Yellow River,
2022
College of Geology and Environment, Xi’an University of Science and Technology, Xi’an 710054, China; Geological Research Institute for Coal Green Mining, 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
Typical Characteristics Of Geological Hazards And Ecological Environment Of Coal Base In The Bends Area Of The Yellow River, Shen Yanjun, Yang Bohan, Wang Shuangming, Kou Haibo, Chen Xing, Xu Yali, Han Senlei
Coal Geology & Exploration
“The ecological protection and high-quality development of the Yellow River Basin” has now been upgraded to a major national strategy. The bends area (the “几” shaped area, also known as the Jiziwan area) is an important part of the Yellow River Basin, and it is also an important gathering area of China’s coal energy. Now the region has six large modern coal bases, coal production accounts for about 40% of the country, in China’s energy security supply security occupies the “ballast” position. However, the region is located in the western arid-semi-arid region, with fragile ecological environment and poor anti-disturbance ability, …
Influence Of Pipeline Crossing On Riverbed Scouring Depth Of Coal Measure Soil,
2022
School of Geosciences and Info-physics, Central South University, Changsha 410083, China; Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Ministry of Education, Changsha 410083, China
Influence Of Pipeline Crossing On Riverbed Scouring Depth Of Coal Measure Soil, Wang Xinlong, Sun Pinghe, Zhao Mingzhe, Wang Jingyuan, Xing Shikuan
Coal Geology & Exploration
For the purpose of studying the influence of pipeline crossing on the riverbed scouring depth of the coal measure soil, different pipeline depths, pipe diameters and scouring velocity were set up to carry out scour simulation tests based on the clay and sandy riverbed model test equipment. The SPSS software was used to perform multiple linear regression analysis on the riverbed scouring depth and the above factors. The results show that the pipeline depth, pipe diameter and scouring velocity are responsible for 71.4% to 80.6% of the change of scour depth. The burial depth significantly and negatively affects the scouring …
Techniques For Prevention And Control Of Ordovician Limestone Water Disasters Based On Modified Water Inrush Coefficient Method,
2022
Xi’an Research Institute, China Coal Technology and Engineering Group Corp., Xi’an 710077, China; Shaanxi Provincial Key Lab of Mine Water Disaster Prevention and Control Technology, Xi’an 710077, China
Techniques For Prevention And Control Of Ordovician Limestone Water Disasters Based On Modified Water Inrush Coefficient Method, Li Kai, Li Xiaolong
Coal Geology & Exploration
There are technical problems in preventing and controlling Ordovician limestone water disasters during mining above ultra-thin aquifuges, such as those of the lower coal group in Weibei Coalfield. At Sangshuping Coal Mine, horizontal directional drilling technology was used to develop water prevention and control ideas of Ordovician limestone top utilization and grouting transformation. Firstly, considering the loss of water resistance in the floor failure zone, the water inrush coefficient method was used to determine the critical thickness of Ordovician limestone top utilization and grouting transformation. The directional drilling exploration was carried out by drilling from the two opposite ends of …
Optimization Design Of High Loess Slope Based On Combination Of Wide And Narrow Platform：A Case Study Of An Industrial Square In Zichang City,
2022
School of Geology Engineering and Geomatics, Chang’an University, Xi’an 710054, China
Optimization Design Of High Loess Slope Based On Combination Of Wide And Narrow Platform：A Case Study Of An Industrial Square In Zichang City, Nan Ning, Li Peng, Su Shengrui, Dong Fu, Ma Chi
Coal Geology & Exploration
The construction of a coal mine industrial square in a mountainous area or hilly area will face the problem of high slopes. The unreasonable high slope design causes serious waste of land resources, environmental damage and an increase in investment, and also brings huge potential safety risks to the infrastructure. Based on this, with a high slope in a coal mine industrial square in Zichang City of Shaanxi Province as an example, the field investigation, theoretical analysis and numerical simulation were used to investigate the influence of different numbers, positions and widths of wide platforms on the stress, strain field …
Conical Source Transient Electromagnetic Response Characteristics With Overburden Based On Occam Constrained Inversion,
2022
School of Geophysics and Measurement and Control Technology, East China University of Technology, Nanchang 330013, China
Conical Source Transient Electromagnetic Response Characteristics With Overburden Based On Occam Constrained Inversion, Li Zhe, Yang Haiyan, Yue Jianhua, Liu Zhixin, Jiang Zhihai, Su Benyu, Zhang Hua, Wang Ling, Yang Fujie
Coal Geology & Exploration
The overburden thickness and conductivity can affect transient electromagnetic response in shallow subsurface investigation. In order to further verify the overburden detection effect with a conical source device, combining all-time apparent resistivity conversion of transient electromagnetic field, the electromagnetic response characteristics of the underlying strata influenced by the overburden was studied by introducing an Occam inversion with stratum information constraints. The results indicate that electromagnetic response intensity of the target layer is related to the resistivity ratio of the overburden to the target layer. With the overburden resistivity gradually increasing, the resistivity fitting degree between inversed data and real value …
Influence Of Admixtures On The Performance Of Soundless Chemical Demolition Agents And Implications For Their Utilization,
2022
Carleton College, Department of Geology, Northfield, Minnesota, 55057, USA
Influence Of Admixtures On The Performance Of Soundless Chemical Demolition Agents And Implications For Their Utilization, Nattamon Maneenoi, Raphael Bissen, Sakonvan Chawchai
Journal of Sustainable Mining
Soundless Chemical Demolition Agents (SCDAs) are an environmentally friendly and safer alternative to traditional rock fragmentation methods. Admixtures are used to change the rheological properties and performance of SCDAs. This study aimed to investigate the effect of various concentrations of chemical accelerators (chloride salts) and viscosity enhancing agents (VEAs: Xanthan gum, Guar gum, and Gellan gum) on the fracture onset compared to an unmodified SCDA (BRISTAR 100®). All experiments were conducted on Portland Type 1 (OPC 1) cement blocks. The flowability of the mixtures was determined by mini-slump tests. Results show that 4wt% MgCl2 and 3wt% CaCl2 have accelerated the …
4d Gas Geological Research On Coal Seam With Gas Hazard Potential In Mining Panel,
2022
Henan Polytechnic University (HPU), School of Safety Science and Engineering, China
4d Gas Geological Research On Coal Seam With Gas Hazard Potential In Mining Panel, Hongqing Cui, Xin He, Zehua Wang
Journal of Sustainable Mining
According to regulations of the mining industry in China, it is necessary to carry out gas hazard prevention projects in advance when mining coal seams with gas hazard potential, and gas geological research should be taken as the basic work for optimal design and effective construction of gas hazard prevention projects. Research on coal seam with gas hazard potential have shown that anomalous geological area could be the gas hazard potential area as well, where superimposed tectonic and mining stress field usually results in tectonically disturbed coal and pressured gas. A 4D gas geological research method is used to find …
Engaging Hard-To-Reach Audiences Through Internal Interdisciplinary And External Diverse Collaborations,
2022
University of Illinois Extension
Engaging Hard-To-Reach Audiences Through Internal Interdisciplinary And External Diverse Collaborations, Erin M. Garrett, Ashley J. Belle
Journal of Extension
Through a combination of internal and external collaborations, consumer-based energy education designed for hard-to-reach audiences was successfully delivered statewide by an interdisciplinary Extension team. Program participants representing rural residents, senior citizens, and low-income audiences demonstrated improvements in knowledge and increased intention to change their home electricity usage behaviors. This outreach work can serve as a model for other Extension services to combine interdisciplinary teams with community partnerships to reach underserved audiences statewide.
Refracturing In The Bakken – An Analysis Of Data From Across North Dakota,
2022
University of North Dakota. Energy and Environmental Research Center
Refracturing In The Bakken – An Analysis Of Data From Across North Dakota, Chantsalmaa Dalkhaa, Nicholas A. Azzolina, Alexander V. Chakhmakhchev, Bethany A. Kurz, James A. Sorensen, Charles D. Gorecki, John A. Harju
EERC Publications, Papers, & Presentations
This presentation will summarize work conducted by the Energy & Environmental Research Center, in close coordination with the state of North Dakota and several Williston Basin oil and gas operating companies through a research program called the Bakken Production and Optimization Program (BPOP), and will cover 1) a review of the wells that have been refractured in the North Dakota portion of the Bakken petroleum system (BPS), 2) an evaluation of production performance of the refractured wells, 3) an assessment of refracturing economics, and 4) an assessment of the potential economic impact of a broad refracturing program applied throughout the …
Experimental Evaluation Of Enhanced Tight Oil Recovery Performance By Microbubble Co2 And Microbubble Rich Gas In North Dakota Plays,
2022
University of North Dakota. Energy and Environmental Research Center
Experimental Evaluation Of Enhanced Tight Oil Recovery Performance By Microbubble Co2 And Microbubble Rich Gas In North Dakota Plays, Yang Yu, Christopher J. Beddoe, Xiqiu Xue, Alexander V. Chakhmakhchev, John A. Hamling, Steven A. Smith, Bethany A. Kurz
EERC Publications, Papers, & Presentations
This study effort was undertaken to 1) provide a first-of-a-kind evaluation of a microbubble CO2 enhanced oil recovery (EOR) technique for application in tight unconventional plays, 2) compare the performance of microbubble CO2 injection with continuous-phase CO2 injection for Red River EOR applications in North Dakota, and 3) investigate the effectiveness and feasibility of microbubble EOR by using a rich gas mixture in low-permeability formations to assess microbubble rich gas EOR performance relative to microbubble CO2 EOR performance.
Investigation Of Produced Gas Injection In The Bakken For Enhanced Oil Recovery Considering Well Interference,
2022
University of North Dakota. Energy and Environmental Research Center
Investigation Of Produced Gas Injection In The Bakken For Enhanced Oil Recovery Considering Well Interference, Lu Jin, Bethany A. Kurz, Mojtaba Ardali, Xincheng Wan, Jin Zhao, Jun He, Steven B. Hawthorne, Aldjia Boualam Djezzar, Yang Yu, Donald Morris
EERC Publications, Papers, & Presentations
To better evaluate the feasibility of applying produced gas injection for EOR in the BPS (Bakken petroleum system) under realistic constraints, a series of field data analyses, modeling/simulations, and experimental activities were performed in this study to fulfill the following two objectives: 1. Design a pilot test to evaluate the technical feasibility of increasing oil production through EOR from the Bakken pool utilizing produced gas while accounting for well interference effects. 2. Investigate a variety of HnP strategies to improve gas injection and oil production performance, as well as maximize achievable EOR benefits with a limited volume of gas that …
Statistical Analysis Of The Petrophysical Properties Of The Bakken Petroleum System,
2022
University of North Dakota. Department of Petroleum Engineering
Statistical Analysis Of The Petrophysical Properties Of The Bakken Petroleum System, Aimen Laalam, Habib Ouadi, Ahmed Merzoug, Abderraouf Chemmakh, Aldjia Boualam, Sofiane Djezzar, Ilyas Mellal, Meriem Djoudi
EERC Publications, Papers, & Presentations
This paper aims to generate permeability-porosity data-driven models for the Bakken formation, representing an unconventional reservoir within the Williston Basin in the US, using 426 core data with a wide range of porosity and permeability.
Completion Optimization In The Bakken Petroleum System Using Data Mining,
2022
University of North Dakota. Energy and Environmental Research Center
Completion Optimization In The Bakken Petroleum System Using Data Mining, Alexander V. Chakhmakhchev, Nicholas A. Azzolina, Bethany A. Kurz, Xue Yu, Chantsalmaa Dalkhaa, Justin T. Kovacevich, James A. Sorensen
EERC Publications, Papers, & Presentations
Therefore, the primary goal of this study was to identify optimal completion practices using publicly available well completion and production information and applying data-mining techniques that could accommodate nonlinear relationships.
Understanding Ch4 Emissions From Compostables: An Exploration Of Local Ch4 Emissions From Landfilled Compostables And The Efficacy Of Emission Mitigation Via Anaerobic Biogas Digestion,
2022
Portland State University
Understanding Ch4 Emissions From Compostables: An Exploration Of Local Ch4 Emissions From Landfilled Compostables And The Efficacy Of Emission Mitigation Via Anaerobic Biogas Digestion, Jordan-Yoosuf Aljbour
University Honors Theses
Methane (CH4) is the second most abundant anthropogenic greenhouse gas within the atmosphere, comprising ~16% of the total anthropogenic greenhouse gas composition on Earth. It has an ~12-year lifetime relative to its eventual oxidation via reaction with tropospheric hydroxyl radicals (OH), and has a 100-year indirect global warming potential (GWP) approximately ranging between 28-36 [Environmental Protection Agency, 2021]. In recent years, the observed average global concentration of atmospheric CH4 has increased by ~11.0% from 2020 (~15.3 ppb) to 2021 (~17.0 ppb) [Dlugokencky et al., 1994; National Oceanic and Atmospheric Administration, 2022]. With …
Geological Structure Detection With Tunnel Transient Electromagnetic Kirchhoff 2d Migration Imaging,
2022
School of Geology Engineering and Geomatics, Chang’an University, Xi’an 710054, China
Geological Structure Detection With Tunnel Transient Electromagnetic Kirchhoff 2d Migration Imaging, Qi Zhipeng, Guo Jianlei, Sun Naiquan, Li Xiu, Fan Yanan
Coal Geology & Exploration
The green construction of tunnel requires not only predicting disaster anomalies such as water inrush and mud inrush in front of tunnel face, but also identifying geological structure to support disaster warning and prevention. The traditional transient electromagnetic interpretation method can only provide resistivity information, which not meet the requirements of tunnel geological disaster management. Therefore, virtual wavefield imaging technology is introduced into the tunnel detection to achieve comprehensive interpretation of the electrical information and structures of disaster anomalies. Firstly, transient electromagnetic data is transformed into virtual wave field. Then, the resistivity imaging method was used to calculate the resistivity …
A Review：Geological Feasibility And Technological Applicability Of Underground Coal Gasification,
2022
Ministry of Education Key Laboratory of Coalbed Methane Resources and Accumulation Process, China; University of Mining and Technology, Xuzhou 221116, China College of Resources and Geosciences, China University of Mining and Technology, Xuzhou 221116, China
A Review：Geological Feasibility And Technological Applicability Of Underground Coal Gasification, Jiang Xiuming, Wu Caifang
Coal Geology & Exploration
Underground coal gasification (UCG) is a potential new method of coal utilization, which is of great significance for alleviating China’s energy crisis, ensuring national energy security, and achieving carbon peaking and carbon neutrality goals. It has always been valued by countries all over the world. On the suitability of UCG resource conditions, the feasibility of process and technology, and the controllability of environmental impact, this paper summarizes the development status of UCG technology, and clarifies the coal resource reserves suitable for UCG technology, different standards of geological area selection and location selection technology, the development history and applicable conditions of …
Simplified Internal Variable Gradient Model For Zonal Disintegration Of Rocks In Circular Underground Tunnels,
2022
Institute of Architectural Engineering, Huanghuai University, Zhumadian 463000, China
Simplified Internal Variable Gradient Model For Zonal Disintegration Of Rocks In Circular Underground Tunnels, He Ziguang, Zhao Fasuo, Chen Haoxiang, Wu Bo, Zhou Jingjing
Coal Geology & Exploration
As one of the typical nonlinear phenomena of deep level surrounding rock masses, zonal disintegration has captured many attentions of geotechnical engineers in the past years. On the basis of the internal variable theory, the closed-form analytical solutions to stress, strain and displacement fields near circular tunnels are obtained. The gradient-dependent solutions are compared with the results of the classical elasticity theory, and the effects of microstructures on the stresses and deformation fields are investigated as well. It is noted that the stress and deformation fields derived from the gradient model show remarkable quasi-periodicity and fluctuation, which is consistent with …
