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2021

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Articles 241 - 270 of 338

Full-Text Articles in Oil, Gas, and Energy

Fracture Feature Recognition Of Sandstone After High Temperature Based On Ra/Af, Ge Zhenlong, Sun Qiang, Wang Miaomiao, Zhao Chunhu Apr 2021

Fracture Feature Recognition Of Sandstone After High Temperature Based On Ra/Af, Ge Zhenlong, Sun Qiang, Wang Miaomiao, Zhao Chunhu

Coal Geology & Exploration

It is of great significance to carry out the research on rock high temperature damage information identification for geothermal development and underground coal gasification. Based on the changes of acoustic emission parameters RA and AF in the failure process of sandstone after different high temperature treatments, the development and evolution law of different types of cracks in sandstone after high temperature treatment are studied. The results show that tensile cracks are dominant in the whole loading process of sandstone. When the loading stress exceeds 80% of the peak stress, the proportion of shear cracks increases rapidly, which can be regarded …

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Long-Term Heat Transfer Performance Of Underground Coaxial Heat Exchanger For Medium-Deep Geothermal, Li Fengcui, Han Ershuai, Liang Lei, Wu Jing'an, Lu Bingxue Apr 2021

Long-Term Heat Transfer Performance Of Underground Coaxial Heat Exchanger For Medium-Deep Geothermal, Li Fengcui, Han Ershuai, Liang Lei, Wu Jing'an, Lu Bingxue

Coal Geology & Exploration

Underground coaxial heat exchanger(UCHE) for medium-deep geothermal has the characteristic of the high heat transfer capacity and outlet water temperature, so it has attracted great attention in the heating industry. However, the current research mainly focus on the heat transfer performance of the UCHE during a single heating period, with insufficient analysis on the long-term heat transfer performance. In this paper, considering the operation characteristics of heat supply in heating season and stopping working in non-heating season for underground coaxial heat exchanger for medium-deep geothermal, a numerical heat transfer model is proposed based on the energy conservation equation. The numerical …

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Effect Of Arbuscular Mycorrhizal Fungi And Hippophae Rhamnoides On The Improvement Of The Dump Of Open-Pit Coal Mine In The Eastern Grassland, Miao Chunguang, Yang Huihui, Bi Yinli, Song Ziheng, Guo Nan Apr 2021

Effect Of Arbuscular Mycorrhizal Fungi And Hippophae Rhamnoides On The Improvement Of The Dump Of Open-Pit Coal Mine In The Eastern Grassland, Miao Chunguang, Yang Huihui, Bi Yinli, Song Ziheng, Guo Nan

Coal Geology & Exploration

The land barren, grassland degradation and difficult ecological restoration are serious in the open-pit mining area of eastern China. The symbiosis between arbuscular mycorrhizal fungi(AMF) and Hippophae rhamnoides and the effect of mycorrhiza on the development of Hippophae rhamnoides root system and the improvement of soil in the dumping site were analyzed. It was found that the plant height and crown width of inoculated AMF(+M) were increased by 20% and 21%, respectively. The root length and root volume of +M were 1.46 and 1.97 times of CK, respectively. The content of Glomalin in the rhizosphere soil of Hippophae rhamnoides in …

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Development Of Deep Geothermal Energy And Its Influence On Geothermal Water Flow Field: Taking The Development Of Deep Geothermal Energy In Lankao County For An Example, Song Qianjin, Wang Gang, Xu Yichuan, Cheng Lei Apr 2021

Development Of Deep Geothermal Energy And Its Influence On Geothermal Water Flow Field: Taking The Development Of Deep Geothermal Energy In Lankao County For An Example, Song Qianjin, Wang Gang, Xu Yichuan, Cheng Lei

Coal Geology & Exploration

In order to study the influence of deep geothermal energy development on the flow field of thermal reservoir, deep geothermal energy development in Lankao County is selected as the research object. The geological structure and regional structure of the study area since Cenozoic are analyzed, and the of geothermal exploitation and existing problems in the area are investigated. According to the types of geothermal energy, the characteristics of the Quaternary(Q), Neogene Minghuazhen Formation(N2) and Neogene Guantao Formation(N1) are analyzed. The conditions of fault distribution, thermal reservoir development and water-resisting boundary in the area are found out …

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Vegetation Disturbance Analysis In Coal Mining Area With High Ground Water Level Based On Landsat Time Series Ndvi Data, Fang Liangcheng, Chen Yongchun, An Shikai, Xu Yanfei, Yin Mengjie, Li Zhihui, Zhao Ping, Chen Yeyu Apr 2021

Vegetation Disturbance Analysis In Coal Mining Area With High Ground Water Level Based On Landsat Time Series Ndvi Data, Fang Liangcheng, Chen Yongchun, An Shikai, Xu Yanfei, Yin Mengjie, Li Zhihui, Zhao Ping, Chen Yeyu

Coal Geology & Exploration

The eastern mining area of China is an important coal and grain composite production area. Due to the flat terrain and high underground diving level, most of the subsidence caused by mining is perennial or seasonal water, which causes serious land, ecological and environmental problems. As an important part of the ecological environment in mining area, vegetation has dynamic characteristics due to the external disturbance and the change of environmental factors. The normalized difference vegetation index(NDVI) is a common indicator for remote sensing monitoring of vegetation growth. The analysis based on NDVI time series data can effectively reveal the disturbance …

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Analysis Of Geophone Array Method In Low Snr Complex Area Of Ordos Basin, Wang Zhengliang, Xiao Guoqiang, Fu Qunli, Lyu Zhenchuan, Yao Zonghui, Shi Qingyang, Gao Bin, Yi Hongbin, Gao Qiang, Zhang Peng, Hou Jie, Shi Bingcheng, Wang Yanduo, Jiao Guixing Apr 2021

Analysis Of Geophone Array Method In Low Snr Complex Area Of Ordos Basin, Wang Zhengliang, Xiao Guoqiang, Fu Qunli, Lyu Zhenchuan, Yao Zonghui, Shi Qingyang, Gao Bin, Yi Hongbin, Gao Qiang, Zhang Peng, Hou Jie, Shi Bingcheng, Wang Yanduo, Jiao Guixing

Coal Geology & Exploration

In the northwest of Ordos Basin, there is serious random interference in the complex area, which leads to the low signal-to-noise ratio of seismic data in this area. In order to solve the problem of low signal-to-noise ratio(SNR) of seismic data in this area, a method study of suppressing random interference by geophone array is carried. The influence of random interference on the accurate calculation of NMO correction and static correction, the suppression of interference wave by geophone array, the influence of intra group height difference and array base distance on high frequency of seismic acquisition data are studied, and …

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Difficulties And Optimization Of Wire-Line Core Drilling Technology For Broken Formation In Complex Structure Area Of Northwest Hunan, Kong Xiangwang, Zhang Shaohe, Wang Wenbin, Sun Pinghe, Wu Dongyu, Xiao Jincheng, He Hongsheng Apr 2021

Difficulties And Optimization Of Wire-Line Core Drilling Technology For Broken Formation In Complex Structure Area Of Northwest Hunan, Kong Xiangwang, Zhang Shaohe, Wang Wenbin, Sun Pinghe, Wu Dongyu, Xiao Jincheng, He Hongsheng

Coal Geology & Exploration

Taking Xiangcidi 1 Well in the complex structural area of northwest Hunan as an example, in view of the common drilling difficulties encountered during the drilling process such as low core adoption rate and stuck-drilling buried drilling, we adopted the self-developed pumpless reverse circulation advanced side spray line and optimized the drilling fluid system to effectively improve the core drilling rate of the drilling project. The new type of drilling tool can form a local reverse circulation at the bottom of the hole, and combined with the internal anti-clogging cone net of the drilling tool and the design of the …

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Sensible/Latent Hybrid Thermal Energy Storage For The Supercritical Carbon Dioxide Brayton Cycle, Kelly Osterman Apr 2021

Sensible/Latent Hybrid Thermal Energy Storage For The Supercritical Carbon Dioxide Brayton Cycle, Kelly Osterman

USF Tampa Graduate Theses and Dissertations

Mitigating the effects of climate change will require rapid deployment of a carbon-free electricity system that includes all available forms of zero-carbon energy. Both renewables and nuclear show great promise, but both come with drawbacks. Power production from wind and solar is limited to times when their respective resources are available, while nuclear is limited in its ability to adjust its output according to the ever-varying demand for electricity. Additionally, the systems must be affordable. One way to reduce the cost of thermal power plants (concentrated solar power and nuclear) is to use new power cycles, such as the supercritical …

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Pakistan's Ordeal Against Climate Change: The Main Contributors And The Way Forward, Fasih Zulfiqar Apr 2021

Pakistan's Ordeal Against Climate Change: The Main Contributors And The Way Forward, Fasih Zulfiqar

CBER Conference

This poster takes a detour through the challenges facing Pakistan in tackling climate change and progress hitherto. It analyzes the main culprits of air pollution in Pakistan and where Pakistan stands relative to other developing nations. The poster concludes on a hopeful note, given the recent government initiatives.

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Is The Relationship Between Mining And Climate Change Only One-Way? Climate Change Potential Impacts On Mining Activity – Hazards, Risks And Adaptation Measures, Małgorzata Markowska Mar 2021

Is The Relationship Between Mining And Climate Change Only One-Way? Climate Change Potential Impacts On Mining Activity – Hazards, Risks And Adaptation Measures, Małgorzata Markowska

Journal of Sustainable Mining

No abstract provided.

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The Level Of Securing Dust Deposits Against The Possibility Of Coal Dust Explosion In The Drilled Dog Headings, Bogdan Malich, Krzysztof Cybulski, Malgorzata Wysocka, Krystian Skubacz, Aneta Michałek, Paweł Urban Mar 2021

The Level Of Securing Dust Deposits Against The Possibility Of Coal Dust Explosion In The Drilled Dog Headings, Bogdan Malich, Krzysztof Cybulski, Malgorzata Wysocka, Krystian Skubacz, Aneta Michałek, Paweł Urban

Journal of Sustainable Mining

The article presents the analysis how the actual coal dust explosion hazard is at the distance of the initial 200 metres of the safety zone maintained along the entire length of driven inclined drift II – face 567 in BRZESZCZE colliery, which was used during realization of the project titled Modelling of the mechanism of explosive coal dust deposition in the vicinity of mined faces in terms of identification, assessment and levelling the possibility of its explosion financed by the National Centre for Research and Development. The mine dust level was between 0.014 kg/m3 and 0.193 kg/m3, …

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The Impact Of Precipitation On State Of The Slopes Surface And Thermal Activity Of The Mine Waste Dump – Preliminary Study, Zenon Różański, Paweł Wrona, Grzegorz Pach, Adam Niewiadomski, Tomasz Suponik, Robert Frączek, Leszek Balcarczyk Mar 2021

The Impact Of Precipitation On State Of The Slopes Surface And Thermal Activity Of The Mine Waste Dump – Preliminary Study, Zenon Różański, Paweł Wrona, Grzegorz Pach, Adam Niewiadomski, Tomasz Suponik, Robert Frączek, Leszek Balcarczyk

Journal of Sustainable Mining

Precipitation, especially with a high intensity, affects the condition of mining waste dumps. The article presents the results of research aimed at determining the impact of rain on water erosion on the slopes of a coal waste dump and its thermal state. Preliminary tests of the condition of two slopes of the coal waste dump in Libiąż (Poland) undertaken in the frameworks of the TEXMIN project was carried out using modern geodesy techniques (low-ceiling photogrammetry and TLS terrestrial laser scanning). The current geometry of the slope surface was faithfully reproduced in the form of a cloud of points with known …

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Promote Ocean Carbon Sinks To Become New Force In Achieving Carbon Neutrality Mar 2021

Promote Ocean Carbon Sinks To Become New Force In Achieving Carbon Neutrality

Bulletin of Chinese Academy of Sciences (Chinese Version)

No abstract provided.

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Blue Carbon Sink Function Of Chinese Coastal Wetlands And Carbon Neutrality Strategy, Faming Wang, Jianwu Tang, Siyuan Ye, Jihua Liu Mar 2021

Blue Carbon Sink Function Of Chinese Coastal Wetlands And Carbon Neutrality Strategy, Faming Wang, Jianwu Tang, Siyuan Ye, Jihua Liu

Bulletin of Chinese Academy of Sciences (Chinese Version)

Coastal wetlands are the main body of the coastal "blue carbon (C)" ecosystem, and their "blue C" and ecosystem service function are important ocean-based climate change governance methods, which is a "nature-based solution". Chinese coastal wetlands are dominated by salt marshes, with little area of mangroves, while the area of unvegetated tidal flats is large. According to conservative estimation, the current C sequestration of coastal wetlands through sediment burial in China reaches to 0.97 Tg C·a-1, and would increase to 1.82-3.64 Tg C·a-1 at the end of this century. To achieve the commitment of "C neutrality" in 2060, China should …

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Strategic Approach For Mariculture To Practice “Ocean Negative Carbon Emission”, Jihong Zhang, Jihua Liu, Yongyu Zhang, Gang Li Mar 2021

Strategic Approach For Mariculture To Practice “Ocean Negative Carbon Emission”, Jihong Zhang, Jihua Liu, Yongyu Zhang, Gang Li

Bulletin of Chinese Academy of Sciences (Chinese Version)

Reducing CO2 emissions and increasing carbon sinks are basic approaches to achieve carbon neutralization in China. China is the largest mariculture country in the world. China's mariculture industry is dominated by non-fed culture type and characterized by rich species, diverse nutrition levels, and advanced farming technology. Therefore, mariculture has huge potential for the development of ocean negative carbon emissions (ONCE). However, the ONCE process of bivalves and seaweed farming is complicated, and the scientific principles, process, mechanisms, monitoring and evaluating methods, and approaches of increasing carbon sink are gradually being recognized and yet to be resolved. This study discusses the …

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Large-Scale Cultivation Of Seaweed Is Effective Approach To Increase Marine Carbon Sequestration And Solve Coastal Environmental Problems, Yufeng Yang, Hongtian Luo, Qing Wang, Zhili He, Aimin Long Mar 2021

Large-Scale Cultivation Of Seaweed Is Effective Approach To Increase Marine Carbon Sequestration And Solve Coastal Environmental Problems, Yufeng Yang, Hongtian Luo, Qing Wang, Zhili He, Aimin Long

Bulletin of Chinese Academy of Sciences (Chinese Version)

All countries in the world are paying attention to low-carbon and carbon neutrality to achieve the mitigation of climate warming by reducing CO2 emissions. Ocean is the largest carbon pool on the earth and play an important role of carbon neutrality. More than half of the biological carbon on the earth is achieved by marine organisms. Among them, seaweed resources are abundant, with advantages such as low cost, high yield, measurable carbon sink, and strong cultivation controllability. Industrialized blue carbon can be formed offshore, which is a sustainable model for future development in coastal ecosystems. In addition, large-scale cultivation of …

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Advocating Eco-Engineering Approach For Ocean Carbon Negative Emission, Yuze Wang, Yun Lu, Jihua Liu, Chuanlun Zhang Mar 2021

Advocating Eco-Engineering Approach For Ocean Carbon Negative Emission, Yuze Wang, Yun Lu, Jihua Liu, Chuanlun Zhang

Bulletin of Chinese Academy of Sciences (Chinese Version)

Micro-organisms such as bacteria, archaea, and viruses are an immense invisible driving force behind the ocean carbon cycle and play a pivotal role in global climate change. Atmospheric CO2 is transformed into depositing organic components with the help of marine planktonic organisms which act as a biological pump (BP). The labile organic components are then transformed into recalcitrant organic carbon (RDOC) through the action of bacteria, archaea, and other organisms and viruses, which are called the microbial carbon pump (MCP). RDOC can be stored over thousands of years in the water column and the accompanying particulate organic matter can further …

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Data Information: Global Carbon Neutralization—Academic Research And Government Planning Mar 2021

Data Information: Global Carbon Neutralization—Academic Research And Government Planning

Bulletin of Chinese Academy of Sciences (Chinese Version)

No abstract provided.

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Development Mechanism And Trading Mode Of Marine Carbon Sink, Yun Zhao, Yue Qiao, Liwei Zhang Mar 2021

Development Mechanism And Trading Mode Of Marine Carbon Sink, Yun Zhao, Yue Qiao, Liwei Zhang

Bulletin of Chinese Academy of Sciences (Chinese Version)

Marine carbon sink is one of the important methods to solve the problem of carbon emission in China. Under the dual constraints of economic development demand and ecological capacity, more policy means need to be explored to achieve carbon emission peak and carbon neutrality in China. There is great potential for the construction of marine carbon sink in China. Hence it is of great significance to build an integrated carbon sink system by combining marine carbon sink with land carbon sink. In the path to achieve marine carbon sequestration increase based on marine ecological improvement, marine breeding, coastal wetland protection …

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Coral Reefs: Potential Blue Carbon Sinks For Climate Change Mitigation, Tuo Shi, Xinqing Zheng, Han Zhang, Qifang Wang, Xin Zhong Mar 2021

Coral Reefs: Potential Blue Carbon Sinks For Climate Change Mitigation, Tuo Shi, Xinqing Zheng, Han Zhang, Qifang Wang, Xin Zhong

Bulletin of Chinese Academy of Sciences (Chinese Version)

Coral reefs are one of the most productive, and yet most vulnerable marine ecosystems. The global decline of coral reefs induced by climate change and human activities has already affected the processes of coral calcification and carbon cycling in the reef ecosystem, intensifying the long-standing CO2 "source-sink" debate over coral reefs. Despite the fact that coral calcification is accompanied by the release of CO2 to the atmosphere, the significance of coral reefs as a carbon sink cannot be ignored, given the complex biogeochemical processes in the reef ecosystem and the characteristic mixotrophic lifestyle of the reef-building corals. From the perspective …

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Acknowledge Of Reviewers Mar 2021

Acknowledge Of Reviewers

Journal of Sustainable Mining

No abstract provided.

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Fabrication And Characterization Methods Of Self-Cleaning Coatings For Solar Panels Application, Mohammed Khaleel M Alhussain Mar 2021

Fabrication And Characterization Methods Of Self-Cleaning Coatings For Solar Panels Application, Mohammed Khaleel M Alhussain

USF Tampa Graduate Theses and Dissertations

Transparent self-cleaning coatings with superhydrophobic and superhydrophilic behavior are of great interest in a wide range of industrial applications such as automotive, solar panels, windows, and optical devices. Each has its uses, properties, and characteristics. For the use of these coatings on solar panels, certain features are important in maintaining the efficiency of the panels in different weather conditions and reducing the operation and maintenance cost, such as self-cleaning, high transparency, antifouling, anti-fogging, and anti-icing. Herein, we have investigated the fabrication of self-cleaning coatings using two simple methods and ways to improve their characteristics. In the first method, a hydrophobic …

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A Retrospective Analysis Of The Impact Of Wind Power Generation On Residential Natural Gas Prices In The United States, Maya Vikstrom Mar 2021

A Retrospective Analysis Of The Impact Of Wind Power Generation On Residential Natural Gas Prices In The United States, Maya Vikstrom

Economics

Heightened concern over the environmental impact and price volatility of natural gas has led to an increased demand for renewable energy. Wind energy is one of the fastest-growing sources of electricity and is the United States’ top renewable energy source. As a substitute for natural gas, wind energy has a direct impact on the demand for natural gas and consequently, the price. Using data from the U.S. Energy Information Administration, the Bureau of Economic Analysis, and the U.S. NOAA, this paper determines a causal relationship between wind generation and natural gas prices because of the random component of weather. Employing …

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Conversion From Coal To Natural Gas At Wright Patterson Air Force Base: An Analysis And Case Study, Tyler A. Ferry Mar 2021

Conversion From Coal To Natural Gas At Wright Patterson Air Force Base: An Analysis And Case Study, Tyler A. Ferry

Theses and Dissertations

Over the last 20 years, natural gas has replaced coal as the preferred fossil fuel for heat and power generation across the United States, due to its increased prevalence, lower cost, and reduced environmental impacts. While most conversion decisions are driven by cost savings, proponents of energy transitions often cite emissions reductions as a tangential benefit. Over the same time, climate change and its impact on the environment and society have come to the forefront of scientific inquiry. One example of the transition from coal to natural gas can be found in Dayton, Ohio. Wright Patterson Air Force Base (WPAFB) …

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Renewable Energy Generation And Ghg Emission Reduction Potential Of A Satellitewater Reuse Plant By Using Solar Photovoltaics And Anaerobic Digestion, Jonathan R. Bailey, Saria Bukhary, Jacimaria R. Batista, Sajjad Ahmad Feb 2021

Renewable Energy Generation And Ghg Emission Reduction Potential Of A Satellitewater Reuse Plant By Using Solar Photovoltaics And Anaerobic Digestion, Jonathan R. Bailey, Saria Bukhary, Jacimaria R. Batista, Sajjad Ahmad

Civil and Environmental Engineering and Construction Faculty Research

Wastewater treatment is a very energy-intensive process. The growing population, increased demands for energy and water, and rising pollution levels caused by fossil-fuel-based energy generation, warrants the transition from fossil fuels to renewable energy. This research explored the energy consumption offset of a satellite water reuse plant (WRP) by using solar photovoltaics (PVs) and anaerobic digestion. The analysis was performed for two types of WRPs: conventional (conventional activated sludge system (CAS) bioreactor with secondary clarifiers and dual media filtration) and advanced (bioreactor with membrane filtration (MBR)) treatment satellite WRPs. The associated greenhouse gas (GHG) emissions were also evaluated. For conventional …

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Construction And Application Of Remote Service Cloud Platform For Mine Water Hazard Prevention And Control, Wang Hao, Dong Shuning, Qiao Wei, Ji Yadong, Zhu Kaipeng, Zhou Zhenfang, Ning Dianyan, Shang Hongbo Feb 2021

Construction And Application Of Remote Service Cloud Platform For Mine Water Hazard Prevention And Control, Wang Hao, Dong Shuning, Qiao Wei, Ji Yadong, Zhu Kaipeng, Zhou Zhenfang, Ning Dianyan, Shang Hongbo

Coal Geology & Exploration

Coal mine water disaster restricts the safe and efficient development of coal resources seriously. Aiming at the typical problems of roof, floor and goaf mine water disaster at present, three aspects of mine water prevention and control in China has been carried out including water hazard assessment, water inflow prediction, water hazard early warning, and water hazard detection and control, etc. However, the intelligence of these prevention and control work is relatively low. In order to solve this problem, this paper developed a multi-data fusion remote service cloud platform for mine water disaster prevention and control combining with the integration …

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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 Feb 2021

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 …

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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 Feb 2021

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 …

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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 Feb 2021

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 …

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Effects Of Alternating Stress On Casing Damage Mechanism, An Fengchen, Zhang Feiyang, Yi Hao, Zhang Sui'an Feb 2021

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 …

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