Oil, Gas, and Energy Commons^™

Application Of Pillar-Free Self-Formed Roadway Technology Under The Influence Of Reserse Faults: Strata Behavior Law And Surrounding Rock Control, Zhang Wenjie, He Manchao, Wang Jiong, Ma Zimin, Cheng Manjiang, Niu Shaokun

Coal Geology & Exploration

To explore the influence of reverse fault activation on the stability of the application of the pillar-free self-formed roadway technology, this study systematically investigated the influencing scope and mechanisms of the reverse fault activation through theoretical analysis, numerical simulations, engineering practice, and field monitoring. The results show that, under the combined action of horizontal tectonic stress and dead weight stress, reverse faults have a significant influence on both the advanced abutment pressure of working faces and the pressure on the roadway roof after coal mining. The reverse fault was locally activated when the working face was close to the reverse …

A Simulation Study On The Formation Mechanisms Of Gas Hydrates In Pores Of Gas Hydrate-Bearing Sediments In The South China Sea, Zheng Mingming, Zhou Kerui, Wu Zurui, Liu Tianle, Yan Shichun, Zeng Guo’Ao

Coal Geology & Exploration

The formation of high-quality gas hydrates in the pores of the sediment matrix serves as the premise and material basis for experimental research on gas hydrates, thus providing theoretical guidance for the exploration of deep-water hydrocarbons and gas hydrates in China. Based on the geological conditions of gas hydrate-bearing sediments in well GMGS2-07 in the South China Sea, this study conducted numerical simulations and laboratory experiments using the TOUGH+HYDRATE code and a self-developed device for gas hydrate reactions and generation, respectively. Firstly, this study verified the accuracy and reliability of the numerical simulation method. Then, it investigated the quality of …

In-Situ Stress Calculation For Coal Reservoirs Based On Log Parameters: A Case Study Of The Southern Yanchuan Block, Chang Chuang, Li Song, Tang Dazhen, Feng Peng

Coal Geology & Exploration

In-situ stress affects the permeability of coal reservoirs throughout the extraction of coalbed methane (CBM) and further influences the migration and output of CBM. To explore the effective methods for calculating the in-situ stress in coal seams, this study investigated the southern Yanchuan block at the eastern margin of the Ordos Basin. Based on the logs and well test data of the major coal seams in the study area, as well as the calculation results of parameters including the coal rock Poisson's ratio, modulus of elasticity, and reservoir pressure of coals, this study built a calculation model for the in-situ …

Differences In The Adsorption/Desorption Characteristics Of Coal Reservoirs With Different Coal Ranks And Their Effects On The Reservoir Productivity, Wang Qingqing, Meng Yanjun, Yan Taotao, Liu Zhenxing, Xu Guangbo, Li Kunjie, Liu Yanfei

Coal Geology & Exploration

Adsorption/desorption parameters are critical to the evaluation of the reserves and productivity potential of coalbed methane (CBM). Moreover, the law governing the desorption process is closely related to the productivity of CBM wells. This study aims to investigate the adsorption/desorption characteristics of coal reservoirs with different coal ranks and their effects on the productivity of the reservoirs. Based on the data of the coal macerals, coal quality, gas content, and isothermal adsorption experiments of 49 coal core samples from the Fanzhuang and Anze blocks in the southern Qinshui Basin and the Baode and Liulin blocks in the eastern Ordos Basin, …

Construction And Experimental Verification Of A Damage Constitutive Model Of Rocks Under Uniaxial Compression Considering Seepage Pressure, Song Zhanping, Wang Jiahui, Pan Hongwei, Yang Pengtao, Yang Tengtian, Tian Song

Coal Geology & Exploration

The construction of tunnels and underground projects in a water abundance environment is subjected to increasingly frequent construction accidents arising from the surrounding rock instability caused by groundwater infiltration. Therefore, establishing a damage constitutive model of rocks under uniaxial compression while considering seepage pressure is of great significance for guiding field construction. To characterize the stress-strain relationships in the process of uniaxial compression damage of rocks, this study introduced concepts such as the deformation model of porous rocks, pore aspect ratio, and self-consistent model and theories such as hydrochemical damage and Weibull distribution-based statistical damage into the original constitutive models …

Research On Dynamic Subsidence Characteristics Of Coal Mine Industrial Square Based On D-Insar Technology, Liu Hui, Chen Sidi, Zhu Xiaojun, Zhang Pengfei, Wang Jinzheng, Wang Qingwei, Si Guangya

Coal Geology & Exploration

In recent years, the subsidence has occurred continuously to the industrial squares of mining areas in the thick water-bearing loose layer in eastern China, resulting in various extent of damage to the surface buildings (structures), which has seriously affected the safe production and normal operation of coal mines. In order to study the subsidence of industrial square in a long series, the dynamic deformation information of the surface was obtained based on 17 scenes of Sentinel-1A image data of a coal mine in Eastern China. On this basis, the surface subsidence monitoring accuracy of D-InSAR technology was analyzed in combination …

Slip Resistance Effect Of Pile-Soil Interface Inclination Angle And Moisture Content On The Anti-Sliding Pile, Li Huaixin, Yan Changgen, Lin Bin, Shi Yuling

Coal Geology & Exploration

To study the slip resistance effect of pile-soil interface with different interface inclination angle and moisture content, the variability of damage modes and shear strengths of assemblies with variable inclination angles under the different conditions of interface inclination angles and water content were compared based on the triaxial unconsolidated undrained test at first. Then, the slip resistance effects of the pile-soil interface with different interface inclination angles and moisture contents were compared by numerical simulation, with consideration to the shear strength parameter of laboratory test. Meanwhile, the critical moisture content w_max was determined based on the plastic deformation theory. …

Technology Of Raising Upper Limit Of Mining By Grouting Reconstruction In Thick Water-Bearing Sand Layer And Its Application, Xing Maolin, Zheng Shitian, Shi Zhiyuan, Zhao Shaolei, Du Botao, Cui Siyuan

Coal Geology & Exploration

In order to set anti-collapse coal (rock) pillars in the thick loose water-bearing sand layer to raise the upper limit of mining, the grouting transformation technology of thick water-bearing sand layer was studied. Aiming at raising the upper limit of mining in the fourth aquifer in working face 1010-1 of Wugou Coal Mine in Huaibei, Anhui. The analysis is conducted through theoretical calculation, experiments on of grouting materials ratio, and in-situ grouting test, with a focus on the scope and horizon of transformation, the applicability of grouting materials, the mix ratio of grout at different depths, the arrangement of drilling …

Temporal And Spatial Variation Characteristics Of Water Conservation Function Of Upper Danjiang River Basin In Qinling Mountains And Its Influencing Factors, Yang Jingyu, Shu Zunyun, Yang Fu, Fu Deliang, Ma Li, Zhang Liwei, Xue Yuze

Coal Geology & Exploration

Effective water conservation function can regulate the regional hydrological cycles and ensure the regional ecological security, which are closely related to human production and life. For this reason, the way to accurately evaluate the water conservation function has become a research hot topics in current ecohydrology. Herein, the temporal and spatial variation rules of water conservation in Upper Danjiang River Basin in Qinling Mountains from 2010 to 2020 were analyzed based on the Distributed Hydrology Soil Vegetation Model (DHSVM) and the water balance method, and the effects of changes in climate and land use on the water conservation function of …

Forward Modeling Of Amplitude Variation With Offset And Azimuth (Avoa) Response For Fracture Parameters Of Horizontal Transversely Isotropic Coal Seams, Wu Haibo, Liu Qinjie, Wang Jinchao, Li Zhi, Bai Ze, Xi Chaoqiang

Coal Geology & Exploration

Fractures serve as a key factor controlling the permeability of coal seams and play a crucial role in the exploration and exploitation of coalbed methane. This study focuses on the Amplitude Variation with offset and Azimuth (AVOA) response mechanisms of the fracture parameters of horizontal transversely isotropic (HTI) coal seams. To this end, this study calculated the equivalent elastic modulus of coal seams with vertical dry and fluid-saturated fractures using the Mori-Tanaka model and the Brown-Korringa anisotropic fluid substitution equation, respectively. Moreover, based on the petrophysical characterization of fractures in coal seams and the forward modeling using the HTI coal …

A Method For Identifying Karst Collapse Columns Based On An Improved Residual Network, Zhang Tian, Sun Lianying, Yang Yan, Tu Shuai, Wang Jinfeng

Coal Geology & Exploration

Coal mining areas have complex geological conditions, and it is critical to predict and identify karst collapse columns in these areas efficiently and accurately. Human-computer interaction is the most frequently employed to interpret karst collapse columns in traditional methods. However, with an increase in the exploration scale and the constant accumulation of generated data, the traditional manual interpretation of karst collapse columns cannot meet the demand for actual coal mining. To improve the identification accuracy of karst collapse columns, this study proposes a Collapse Column Identification Network (CINet) model, which takes the automatic recognition of karst collapse columns as binary …

Image Sharpening Method Of Automatic Loading And Unloading Drill Pipe Target In Underground Coal Mine, Yao Ningping, Liang Chunmiao, Yao Yafeng, Song Haitao

Coal Geology & Exploration

Due to the space limitation of underground roadway in coal mine, the drilling robot is designed with two independent systems, i.e., the drilling system and the drilling pipe loading and unloading system, which are in flexible layout. Using the monocular visual identification based on cooperative target, the drilling system is associated with the drilling pipe loading and unloading system for the cooperative operation of the two systems to deliver the drill pipe. However, there are problems such as borehole cinder, cooperative target polluted by sewage, high dust concentration, low visibility, low luminance of artificial light source, uneven illumination resulting in …

3d Model Reconstruction Of Large-Diameter Rescue Well Based On Depth Camera, Gu Hairong, Luo Jia, Gao Ziyu, Yang Wenjuan, Han Shuai

Coal Geology & Exploration

Large-diameter borehole rescue is an effective emergency rescue method for mine disasters. Through the large-diameter rescue well that is constructed to the place where the trapped personnel is located, the trapped personnel can be lifted safely and reliably to the ground by a hoisting capsule. The structural parameters of a large-diameter rescue well and their changes have significant impact on the passing performance of the hoisting capsule. The real-time acquisition of the structural parameters of large-diameter rescue well is the basis of scientific operation and decision-making of large-diameter borehole rescue. In order to satisfy the requirements for monitoring of the …

Study On Factors Influencing The Self-Propelling Capacity Of Self-Propelled Water Jet Drill Bits, Liu Yong, Dai Shuo, Wei Jianping, Zhang Hongtu, Yuan Yongwang, Guo Xinhui, Gao Yingjun

Coal Geology & Exploration

The structural characteristics of inner flow field in a pipeline are the key factors influencing the self-propelling capacity and descaling-unblocking capability of the self-propelled drill bit. To address the problem concerning the effect of the changes in the inner flow field of a pipeline under the joint action of multiple jets on the self-propelling force and the resistance to water backflow, the changes of inner flow field in the pipeline under different conditions were numerically analyzed based on FLUENT, and thus the influence law of the angle of rear nozzle, the rotational speed, the annular ratio and the system pressure …

Community Microgrids As An Equitable Climate Resilience And Adaptation Strategy In California, Savanna Olivia Smith

Master's Projects and Capstones

Climate change summons more extreme and frequent weather events that threaten communities’ access to power. Without power, businesses lose revenue, essential services are limited, people are exposed to extreme temperatures, and lives are lost. California has adopted microgrids as a solution to costly power outages, electrification needs, and renewable energy goals. This work evaluates the adoption of microgrids as an equitable climate resilience and adaptation strategy through a geospatial analysis of California’s resilience investment needs, a case study analysis of 9 existing tribal and rural microgrids, and a gap analysis of California and federal policies and incentive programs. Programs like …

Clean Energy At The Crossroads Of America: An Integrated Resource Plan For Northern Indiana Public Service Company, Llc (Nipsco), Saad Z. Khan, Shend Boshnjaku

Master's Projects and Capstones

This paper outlines an Integrated Resource Plan (IRP) for the Indiana electric utility company, NIPSCO, looking forward to the year 2050 and evaluating different pathways to net zero emissions from the power generation sector. It is a plan for the future, identifying the most cost-effective and reliable mix of resources to meet the energy needs of NIPSCO's customers and reaching decarbonization goals by mid-century.

Climate Change Impacts To Oil Spill Risk And Assessing California's Preparedness, Adeline L. Ford

Master's Projects and Capstones

This report investigates the possibility that climate change could increase the risk of oil spills in California. The primary climate change impact reviewed is the increasing severity of storms and extreme weather events. Natural disasters can be the initiating cause of technological accidents and the increasing severity or frequency of intense storms may increase the likelihood of an oil spill from refineries, extraction/drilling rigs, or oil in transport. A literature review of climate adaptation strategies and storm intensity predictions was completed to determine if severe storm events are expected to increase in intensity or frequency. A review of oil spill …

An Integrated Resource Plan For Tucson Electric Power Company, 2020-2050, Timothy Gary Sheehan Jr, Danny Alexander Zepeda

Master's Projects and Capstones

According to the Environmental Protection Agency, the United States electric power industry is responsible for 25% of the country’s greenhouse gas emissions. As a result, many utilities face state mandates which force electric utilities to reduce their emissions by decreasing reliance on fossil fuels. An Integrated Resource Plan (IRP) is the primary method by which electric utilities plan all aspects of future electricity supply and demand, presenting how the company will deliver reliable and affordable energy while meeting statutory requirements. We propose three IRP scenarios through 2050 for Tucson Electric Power (TEP), an electric utility in southern Arizona. The first …

Desal In So. Cal - Are We There Yet?, Luke F. Swanson

Master's Projects and Capstones

Southern California has access to a finite amount of water that is vulnerable to the state’s changing climate and growing population. The increasing population’s water demands and hydrologic variability due to climate change inspire different proposals to solve these water limitations. Seawater or brackish water desalination and wastewater recycling are all water resources that have the potential to help meet the water needs of Southern California, specifically the South Coast Hydrologic Region. Every water resource requires energy to transport, treat, and distribute the water for use; in an era of climate change, when energy use contributes to greenhouse gases, utilities …

Energy And Climate Change Issues Around Csudh, Alex E. Perez, Tara B. Jones, Raju Bista, Parveen K. Chhetri

CSU Journal of Sustainability and Climate Change

Climate change is posing significant challenges to California’s energy sector. Extreme weather events (heat and cold) may pressure existing infrastructure. Many studies have indicated that extreme climate events would impact the energy system by affecting peak electricity demand. However, very few studies have been conducted to understand how disadvantaged communities (DACs) will be impacted. Because of unequal access to energy infrastructure (electricity generation and battery storage), DACs are more vulnerable to power outages due to the rising number of significant weather events caused by climate change. To address the issue of how DACs are disproportionately affected by climate change-related energy …

Producer Long-Term Marketing Opportunities With Ethanol Plants, Austin Harthoorn, Logan Lloyd, Cory Walters, Kate Brooks

Cornhusker Economics

Commodity marketing operates in a complex decision environment with constant information flow, which can conceal long-run financially profitable marketing opportunities for producers. In the corn marketing space, the competitive role of ethanol plants throughout the state may provide producers with long-run financial gains by strategically approaching marketing decisions. In this article, we characterize whether producers can gain financially from strategically marketing corn to ethanol plants. For example, do ethanol plants provide a better long-run return from pre-harvest hedging, spring sale, or harvest sale?

We investigate three important contracting times--forward contract for harvest delivery (called pre-harvest hereafter), harvest delivery, and spring …

Can Renewable Portfolio Standards Explain The U.S. States’ Advancement Of Wind Energy?, Elise Monson

Political Science Theses and Capstones

No abstract provided.

Synthesis Of A Phenyl Substituted Zinc Dipyrrin Complex For The Purpose Of Analyzing Aromatic Substitutions On The Characteristics Of Compounds Of This Class, Kole Owen

Undergraduate Honors Theses

The field of photochemistry is as innovative in development as it is broad in application. However, utilization of energy from the sun’s electromagnetic radiation remains secondary to the combustion of fossil fuels for the global energy consumption. This is neither a sustainable nor renewable system, and it has contributed to a major decline in the health of our global environment as the greenhouse gases emission has led to an incline in global temperatures and ocean acidity. To develop effective ways to utilize solar energy, experimental effort is being directed towards the understanding of photosensitizers, molecules which absorb solar radiation and …

Addressing The Challenged Of Dcop Based Decision-Making Algorithms In Modern Power Systems, Luis Daniel Ramirez Burgueno

Open Access Theses & Dissertations

Natural disasters have been determined as the leading cause of power outages, causing not only huge economic losses, but also the interruption of crucial welfare activities and the arise of security concerns. Because of the later, decision-making considering grid modernization, power system economics, and system resiliency has been a crucial theme in power systemsâ?? research. The need to better withstand catastrophic events and reducing the dependency of bulky generating units has propelled the development and better management of behind-the-meter generation or distributed energy resources (DERs). DERs can assist in the grid in different manners, not only by meeting energy demand …

Metastability And Degradation In Cu(In,Ga)Se2 Thin-Film Solar Cells, Mohsen Jahandardoost

UNLV Theses, Dissertations, Professional Papers, and Capstones

Cu(In,Ga)(S,Se)2 or CIGS is a thin-film semiconductor that has shown a device efficiency of 23.35% and 24.2% for single-junction and perovskite/CIGS tandem solar cells, respectively. CIGS offers promising properties such as tunable bandgap and ease of processing making them great candidates for thin-film tandem devices. However, knowledge of the effect of material defects, buffer materials, and post-deposition treatment (PDT) on degradation and metastability behavior in these devices is not well understood.In this dissertation, metastability and long-term degradation of CIGS thin-film solar cells have been investigated under combinatorial stress factors of heat, light, and voltage bias to systematically understand the effect …

A One-Dimensional Analysis Of A Microbial Fuel Cell For Efficient Acetate Removal And Power Density Output, David Rouhani

UNLV Theses, Dissertations, Professional Papers, and Capstones

Microbial fuel cells (MFCs) are electrochemical devices that utilize microorganisms to convert organic matter into electrical energy. MFCs have been discussed to have potential application for sustainable wastewater treatment due to their ability to generate electricity while simultaneously treating contaminated water. To optimize MFC performance, numerical models can be used to understand the complex electrochemical and biological processes occurring in the system. In this study, a numerical model was developed to simulate the performance of MFCs under varying operating conditions and to investigate the performance of a MFC for treating wastewater fuel. More specifically, the MFC was modeled to oxidize …

Fabrication Of Solid Oxide Fuel Cell Components Using Stereolithography 3d Printing, Hannah Dyer

Mechanical & Aerospace Engineering Theses & Dissertations

Transitioning from fossil fuel supplied energy to renewable technology must meet cost efficient parameters throughout the manufacturing process while possessing the characteristics of a functioning and reliable power source. With a significant demand in renewable energy products, developmental techniques require adaptive approaches and procedures for novel materials in the manufacturing phase. This report proposes how a solid oxide fuel cell (SOFC), a renewable energy system, can employ additive manufacturing for directly 3D printing its components by utilizing stereolithography (SLA) 3D printing techniques. Fabrication of the printed components from the mixtures were first mixed with varying concentrations of ceramic powder and …

Numerical Simulation On Development Effect Of Tar-Rich Coal Through In-Situ Conversion By Convective Heating In Huangling Mining Area, Dong Guangshun, Zhu Chaofan, Li Jiazong, Xu Shaotao, Guo Wei

Coal Geology & Exploration

The effective development of tar-rich coal to extract oil is of great practical significance to alleviate the oil and gas tension in China, and the convective heating technology of underground in-situ mining is one of the main technologies for the effective development of tar-rich coal. Herein, the mining effect and energy return rate of the two heating media (high-temperature steam and nitrogen) under different injection pressures were studied by convective heating technology for underground in-situ conversion mining based on the tar-rich coal seam of Yan'an Formation in Huangling Mining Area. The results show that: the heating efficiency of steam injection …

Mechanical Property Evaluation Of Coal Bed And Favorable Area Prediction Of Coalbed Methane (Cbm) Development Based On Well Logging: A Case Study Of No. 3 Coal Bed In Zhengzhuang Block, Southern Qinshui Basin, Qiu Feng, Liu Jinhua, Cai Yidong, Liu Dameng, Sun Fengrui

Coal Geology & Exploration

Accurately grasping the mechanical properties of coal is of great significance to reservoir reconstruction and CBM development. Herein, the prediction model of shear wave time difference in coal reservoir based on multiple logging parameters and the brittleness index evaluation model based on dynamic and static mechanical parameter conversion were established for the research horizon of No.3 coal bed in Zhengzhuang Block. The brittleness index of coal reservoir in the study area was comprehensively evaluated by elastic parameter method. By this way, it is found that the brittleness index of coal bed in single well is obviously affected by “boundary effect” …

Threshold Segmentation Method Of Ct Scanning Data Of Coal And Rock Samples Considering Beam Hardening Effect And Its Application, Wang Kai, Fu Qiang, Xu Chao, Ai Zibo, Wang Lei, Shu Longyong

Coal Geology & Exploration

Beam hardening is a common phenomenon in the application of industrial computerized tomography (ICT). It can cause different grayscale values in components with the same density, which affects the threshold segmentation and later reconstruction of components seriously. Herein, study was conducted on the distribution law of grayscale values under the effect of beam hardening, so as to segment the CT scanning data of coal and rock samples under the beam hardening effect accurately. Through the study, it is found that the change in grayscale value on the grayscale beam could truly reflect the change in component density, which is proved …