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Microscale crack propagation in shale samples using focused ion beam scanning electron microscopy and three-dimensional numerical modeling

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Petroleum Science 2023年第3期20卷 1488-1512页

作者： Xin Liu Si-Wei Meng Zheng-Zhao Liang Chun'an tang jia-Ping Tao ji-zhou tang aState Key Laboratory of Coastal and Ofshore Engineering Dalian University of TechnologyDalianLiaoning11624China Research Institute of Petroleum Exploration Development China National Petroleum CorporationBeijing100083China State Key Laboratory of Marine Geology Tongji UniversityShanghai200092China

Reliable prediction of the shale fracturing process is a challenging problem in exploiting deep shale oil and gas *** fracture networks need to be artificially created to employ deep shale oil and gas *** distributed minerals and heterogeneities in shales significantly affect mechanical properties and fracturing behaviors in oil and gas *** the actual microstructure and associated heterogeneities in shales constitutes a significant *** RFPA3D(rock failure process analysis parallel computing program)-based modeling approach is a promising numerical technique due to its unique capability to simulate the fracturing behavior of *** improve traditional numerical technology and study crack propagation in shale on the microscopic scale,a combination of high-precision internal structure detection technology with the RFPA^(3D) numerical simulation method was developed to construct a real mineral structure-based modeling ***,an improved digital image processing technique was developed to incorporate actual shale microstructures(focused ion beam scanning electron microscopy was used to capture shale microstructure images that reflect the distri-butions of different minerals)into the numerical ***,the effect of mineral inhomogeneity was considered by integrating the mineral statistical model obtained from the mineral nanoindentation experiments into the numerical *** simulating a shale numerical model in which pyrite particles are wrapped by organic matter,the effects of shale microstructure and applied stress state on microcrack behavior and mechanical properties were investigated and *** this study,the effect of pyrite particles on fracture propagation was systematically analyzed and summarized for the first *** results indicate that the distribution of minerals and initial defects dominated the fracture evolution and the failure *** are generally initiated and propagate

关键词： FIB-SEM Digital imageprocessing Realistic microstructure 3D digital shale fracture process simulation Pyrite

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Numerical study of hydraulic fracturing in the sectorial well-factory considering well interference and stress shadowing

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Petroleum Science 2023年第6期20卷 3567-3581页

作者： Yu-Hao Liu jin-Tao Zhang jie Bai Feng-Shou Zhang ji-zhou tang Key Laboratory of Geotechnical&Underground Engineering of Ministry of Education Tongji UniversityShanghai200092China Department of Geotechnical Engineering College of Civil EngineeringTongji UniversityShanghai200092China Southwest Oil&Gas Field Company PetroChinaChengdu610017SichuanChina Oil and Gas Technology Research Institute PetroChina Changqing Oilfield CompanyXi’an710021ShaanxiChina National Key Laboratory of Marine Geology Tongji UniversityShanghai200092China School of Ocean and Earth Science Tongji UniversityShanghai200092China

In the Changqing Oilfield in northwest China, when traditional petroleum exploitation encounters forestry reserves or water source protection areas, sectorial well-factory design is proposed. The most distinct feature of a sectorial well-factory is the deviation of the well from the minimum horizontal principal stress, resulting in hydraulic fracture deflection after the initiation, along with possible well interference (i.e., fracture hit) and fracture coalescence in the oblique wells. Four indexes describing well deflection are then proposed according to fracture morphology. Several fracturing designs, including stage arrangement, fracturing sequences, and fracturing techniques are applied to study the feasibility of the sectorial well-factory design. The results show that the “gradual” or “sparse” stage arrangement, large injection rate, and simultaneous multifracture treatment can help to optimize the fracture morphology and stimulation design. However, the subsequent stress shadowing effect usually adversely affects the fracturing of adjacent wells. With a small initial horizontal stress difference, large injection rate and staggered stage arrangement can achieve ideal stimulation performance. Our results can provide a guidance for optimizing stimulation design in unconventional well-factory while taking into account environmental protection.

关键词： Hydraulic fracturing Sectorial well-factory Fracture deflection Well interference Stress shadowing

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Numerical investigation on the effect of depletion-induced stress reorientation on infill well hydraulic fracture propagation

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Petroleum Science 2022年第1期19卷 296-308页

作者： Feng-Shou Zhang Liu-Ke Huang Lin Yang Egor Dontsov Ding-Wei Weng Hong-Bo Liang Zi-Rui Yin ji-zhou tang Key Laboratory of Geotechnical&Underground Engineering of Ministry of Education Tongji UniversityShanghai200092China Department of Geotechnical Engineering College of Civil EngineeringTongji UniversityShanghai200092China State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan430071China ResFrac Corporation Palo AltoCA94301USA PetroChina Research Institute of Petroleum Exploration and Development Langfang065007China State Key Laboratory of Marine Geology Tongji UniversityShanghai200092China School of Ocean and Earth Science Tongji UniversityShanghai200092China

Depletion-induced stress change causes the redistribution of stress field in reservoirs,which can lead to the reorientation of principal *** reorientation has a direct impact on fracture propagation of infill *** understand the effect of stress reorientation on the propagation of infill well’s fractures,an integrated simulation workflow that combines the reservoir flow calculation and the infill well hydraulic fracturing modeling is *** reservoir simulation is computed to examine the relationship between the extent of stress reversal region and reservoir ***,the hydraulic fracturing model considering the altered stress field for production is built to characterize the stress evolution of secondary *** simulations show that stress reorientation may occur due to the decreasing of the horizontal stresses in an elliptical region around the parent ***,the initial stress difference is the driving factor for stress ***,the bottom hole pressure,permeability and other properties connected with fluid flow control timing of the stress *** decrease of the horizontal stresses around the parent well lead to asymmetrical propagation of a hydraulic fracture of the infill *** study provides insights on understanding the influence of stress reorientation to the infill well fracturing treatment and interference between parent and infill wells.

关键词： Infill well Depletion Hydraulic fracture Stress reorientation Asymmetry fracture

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Dispatchable Capability of Aggregated Electric Vehicle Charging in Distribution Systems

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Energy Engineering 2025年第1期122卷 129-152页

作者： ShiqianWang Bo Liu Yuanpeng Hua Qiuyan Li Binhua tang jianshu zhou Yue Xiang Economic and Technology Research Institute State Grid Henan Electric Power CompanyZhengzhou450052China College of Electrical Engineering Sichuan UniversityChengdu610065China

This paper introduces a method for modeling the entire aggregated electric vehicle(EV)charging process and analyzing its dispatchable *** methodology involves developing a model for aggregated EV charging at the charging station level,estimating its physical dispatchable capability,determining its economic dispatchable capability under economic incentives,modeling its participation in the grid,and investigating the effects of different scenarios and EV penetration on the aggregated load dispatch and dispatchable *** results indicate that using economic dispatchable capability reduces charging prices by 9.7%compared to physical dispatchable capability and 9.3%compared to disorderly ***,the peak-to-valley difference is reduced by 64.6%when applying economic dispatchable capability with 20%EV penetration and residential base load,compared to disorderly charging.

关键词： Aggregated charging dispatchable capability peak shaving and valley filling the economics of charging demand response

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“一带一路”国际合作的法律服务需求与供给定位——首届“一带一路”涉外法律服务论坛综述

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北京联合大学学报（人文社会科学版） 2017年第3期15卷 118-124页

作者：杨积堂周悦刘苍瑜北京联合大学管理学院北京100101

"一带一路"国际合作,已经从中国的倡议,快速演进成为影响世界经济与合作的强大"合唱",全球100多个国家和国际组织积极支持和参与"一带一路"建设,逐渐从理念转化为行动。"求木之长者,必固其根本;欲流之远者,必浚其泉源。""一带一路"国际... 详细信息

"一带一路"国际合作,已经从中国的倡议,快速演进成为影响世界经济与合作的强大"合唱",全球100多个国家和国际组织积极支持和参与"一带一路"建设,逐渐从理念转化为行动。"求木之长者,必固其根本;欲流之远者,必浚其泉源。""一带一路"国际合作的法律服务需求与供给定位是亟需研究的现实课题,"一带一路"中外企业合作共同需要法律服务保障,法律保障是"一带一路"国际合作的基础性关键要素,同时,中国更需要高度重视参与和引领新规则的创设,以之固化国际合作以及全球治理新模式。

关键词：一带一路国际合作法律服务法律需求法律供给

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Relationship Between Developmental Intensity of Landslide and Malan Loess Cohesion at a Regional Horizontal Space Scale

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Journal of Earth Science 2025年

作者： Yongheng zhou Yaming tang Bo Hong Fan Feng Longhui Wang Institute of Geological Survey， China University of Geosciences (Wuhan) Institute of Earth Environment， Chinese Academy of Sciences Xi'an Geological Survey Center China Geological Survey Chinese Academy of Geological Sciences

Malan loess is highly water-sensitive， with its shear strength， particularly cohesive strength， significantly decreasing under the influence of water. The Western Shanxi Loess Plateau （WSLP） is especially prone to loess landslides， which are closely linked to rainfall infiltration. Understanding the regional variation of Malan loess cohesion (cm) and its distribution in relation to the developmental intensity of landslides in this area can provide essential scientific evidence for effective landslide prevention. Loess landslides and Malan loess were selected as the objects of study for the current research. The regional variation and distribution pattern of the cmwere revealed through undisturbed loess direct shear tests and Inverse Distance Weighting （IDW） interpolation. The relationship between the developmental intensity of landslide and the regional variation of the cmwas explored using the Cumulative Sum Variable Dimension Fractal （CSVDF）， Frequency Ratio （FR） model， and Certainty Factor （CF） model. The following conclusions were drawn: Results from the direct shear tests and IDW method indicate that the cmtends to decrease from south to north and exhibits a positively skewed spatial distribution pattern. The CSVDF results indicates a similarity between the regional variation of the cmand the development intensity of loess landslides. The FR and CF results reveal that loess landslides are more likely to occur when the cmis between 0 and 16.14 kPa.

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Electrode/Electrolyte Optimization‑Induced Double‑Layered Architecture for High‑Performance Aqueous Zinc‑(Dual)Halogen Batteries

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Nano-Micro Letters 2025年第3期17卷 121-137页

作者： Chengwang zhou Zhezheng Ding Shengzhe Ying Hao jiang Yan Wang Timing Fang You Zhang Bing Sun Xiao tang Xiaomin Liu School of Textiles and Clothing School of Chemistry and Chemical EngineeringQingdao UniversityQingdao 266071ShandongPeople’s Republic of China Centre for Clean Energy Technology School of Mathematical and Physical SciencesFaculty of ScienceUniversity of Technology SydneyUltimoNSW 2007Australia School of Chemistry and Chemical Engineering Henan Normal UniversityXinxiang 453007HenanPeople’s Republic of China

Aqueous zinc-halogen batteries are promising candidates for large-scale energy storage due to their abundant resources,intrinsic safety,and high theoretical ***,the uncontrollable zinc dendrite growth and spontaneous shuttle effect of active species have prohibited their practical ***,a double-layered protective film based on zinc-ethylenediamine tetramethylene phosphonic acid(ZEA)artificial film and ZnF2-rich solid electrolyte interphase(SEI)layer has been successfully fabricated on the zinc metal anode via electrode/electrolyte synergistic *** ZEA-based artificial film shows strong affinity for the ZnF2-rich SEI layer,therefore effectively suppressing the SEI breakage and facilitating the construction of double-layered protective film on the zinc metal *** double-layered architecture not only modulates Zn2+flux and suppresses the zinc dendrite growth,but also blocks the direct contact between the metal anode and electrolyte,thus mitigating the corrosion from the active *** employing optimized metal anodes and electrolytes,the as-developed zinc-(dual)halogen batteries present high areal capacity and satisfactory cycling *** work provides a new avenue for developing aqueous zinc-(dual)halogen batteries.

关键词： Zn metal anodes Double-layered protective film Electrode/electrolyte optimization Aqueous zinc-(dual)halogen batteries

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根与耕:“麦田农夫”视野下的城市型大学与社区互动——以朝阳区麦子店社区治理田野调查为例

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北京联合大学学报 2017年第2期31卷 12-17页

作者：杨积堂周悦北京联合大学管理学院北京100101

城市大学与城市社区之间的关系是大学和社区都需要面对的命题,封闭与隔膜所导致的是发展迟滞和脱节,互动与合作方能赢得相融和共进。麦子店社区是万千城市社区的一个缩影,它的真实模样和发展需求,需要所在城市高等院校的认知与衔接,它... 详细信息

城市大学与城市社区之间的关系是大学和社区都需要面对的命题,封闭与隔膜所导致的是发展迟滞和脱节,互动与合作方能赢得相融和共进。麦子店社区是万千城市社区的一个缩影,它的真实模样和发展需求,需要所在城市高等院校的认知与衔接,它所蕴含的丰富实践和典型经验,是进行人才培养和科学研究时难得的珍奇宝库。城市的最根本细胞是城市社区,城市型大学需植"根"社区,编织与城市之间相融互通的纽带,在人才培养、科学研究、社会服务、文化传承创新等方面都要立足于城市,服务于社区。同时,更需深"耕"社区,注重大学与社区互动的着力度和契合度,彼此推开大门,构建互动机制、合作机制和回馈机制,铸造城市型大学与所在城市契合共进的强大引擎。

关键词：麦子店社区城市型大学社会治理社区治理基层民主

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河西走廊城镇化与水资源效益的时空格局演变

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干旱区研究 2017年第2期34卷 452-463页

作者：梁变变石培基周文霞唐笑西北师范大学地理与环境科学学院甘肃兰州730070

干旱区城镇化的发展与水资源密切相关,实现两者的协调对区域可持续发展至关重要。以河西走廊20个县(区)为研究单元,构建城镇化与水资源效益的综合评价指标体系,使用熵值法赋权计算河西走廊2000、2005、2010、2013年的城镇化水平和水资... 详细信息

干旱区城镇化的发展与水资源密切相关,实现两者的协调对区域可持续发展至关重要。以河西走廊20个县(区)为研究单元,构建城镇化与水资源效益的综合评价指标体系,使用熵值法赋权计算河西走廊2000、2005、2010、2013年的城镇化水平和水资源效益,运用探索性空间数据分析(ESDA)和协调发展模型,分析4个时间节点城镇化水平与水资源效益的集聚扩散状态及其时空格局和两者的协调性。结果表明:河西走廊城镇化水平的空间分布状态不稳定,变化显著;水资源效益呈现出分散的时空格局并保持相对稳定,且河西走廊及其3个内陆河流域的城镇化水平与水资源效益差异明显。同时,城镇化水平与水资源效益的协调发展水平逐步提高,协调发展类型主要为低和较低,且3大内陆河流域之间存在差异。

关键词：城镇化水资源效益时空格局协调发展度河西走廊

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A coordinated planning strategy of energy storage allocation and line upgrading to increase photovoltaic consumption with lowest planning cost

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Science China Technological Sciences 2025年

作者： Bo ZHANG Yuqi ji Lu ZHANG Wei tang Xiaohui ZHANG Liang WANG Haoran DING Hanchen MAO College of Information and Electrical Engineering China Agricultural University State Grid Heilongjiang Electric Power Research Institute State Grid Heilongjiang Electric Power Company Limited School of Electrical and Information Engineering Zhengzhou University of Light Industry

Random integration of massive distributed photovoltaic (PV) generation poses serious challenges to distribution networks. Voltage violations, line overloads, increased peak–valley differences, and power-flow reversals can occur at different locations, times, and severities. Traditional planning methods such as energy storage (ES) allocation and upgrading of lines may result in poor economics and low equipment utilization. This study proposes a distribution-network planning strategy that coordinates three planning mechanisms:ES allocation to substations and to feeders, and line upgrading. The proposed strategy achieved the lowest annual cost, considering the distribution network problems at different locations, times, and severities. A net load curve description method was first proposed considering economic planning and the uncertain distribution of loads and PVs. Second, a multistage optimization model for ES allocation and line upgrading was established based on the net load curves. Finally, an improved IEEE33 node system was used in the case study. The planning results show that the proposed coordinated planning strategy can address the problems caused by the random integration of massive distributed PVs, improve equipment utilization, and obtain the lowest total annual planning cost.

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