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Fractures interaction and propagation mechanism of multi-cluster fracturing on laminated shale oil reservoir

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Petroleum Science 2024年第4期21卷 2600-2613页

作者： Jia-xin lv Bing Hou Department of Petroleum Engineering China University of Petroleum(Beijing)at KaramayKaramay834000XinjiangChina Key Laboratory of Petroleum Engineering Ministry of EducationChina University of Petroleum(Beijing)Beijing102249China State Key Laboratory of Petroleum Resources and Engineering China University of Petroleum(Beijing)Beijing102249China

The continental shale reservoirs of Jurassic Lianggaoshan Formation in Sichuan Basin contain thin lamina,which is characterized by strong plasticity and developed longitudinal shell limestone *** improve the production efficiency of reservoirs by multi-cluster fracturing,it is necessary to consider the unbalanced propagation of hydraulic fractures and the penetration effect of *** paper constructed a numerical model of multi-fracture propagation and penetration based on the finite element coupling cohesive zone method;considering the construction cluster spacing,pump rate,lamina strength and other parameters studied the influencing factors of multi-cluster fracture interaction propagation;combined with AE energy data and fracture mode reconstruction method,quantitatively characterized the comprehensive impact of the strength of thin interlayer rock interfaces on the initiation and propagation of fractures that penetrate layers,and accurately predicted the propagation pattern of hydraulic fractures through laminated shale oil *** results revealed that in the process of multi-cluster fracturing,the proportion of shear damage is low,and mainly occurs in bedding fractures activated by outer *** the cluster spacing enhances the fracture system's penetration ability,though it lowers the activation efficiency of *** high plasticity of the limestone interlayer may impact the vertical propagation distance of the main *** the interface strength is beneficial to the reconstruction of the fracture height,but the interface communication effect is *** selection of layers with moderate lamina strength for fracturing stimulation,increasing the pump rate during fracturing and setting the cluster spacing reasonably are beneficial to improve the effect of reservoir stimulation.

关键词： Laminated shale Multi-cluster fracturing Cross-layer Cohesive zone model Acoustic emission technique

Recent Advances in Domino Synthesis of Fused Polycyclic N-Heterocycles Based on Intramolecular Alkyne Hydroamination under Copper Catalysis

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Chinese Journal of Chemistry 2023年第24期41卷 3751-3771页

作者： Zefeng Jin Guodong Shen xin lv Key Laboratory of the Ministry of Education for Advanced Catalysis Materials College of Chemistry and Materials ScienceZhejiang Normal UniversityJinhuaZhejiang321004 China School of Chemistry and Chemical Engineering Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell TechnologyLiaocheng UniversityLiaochengShandong252059 China

Fused polycyclic N-heterocycles are very important scaffolds in biomedicinal chemistry and materials *** alkyne hydroamination is a powerful method for the construction of *** the last two decades,copper-catalyzed domino reactions based on intramolecular alkyne hydroamination has emerged as a robust strategy for assembling various fused polycyclic *** progress has been achieved in this *** short review covers the advances made in copper-catalyzed domino synthesis of fused polycyclic N-heterocycles based on the strategy from 2008 to 2023,and will hopefully serve as an inspiration towards the exploration of new copper-catalyzed versions of the *** domino transformations are introduced and discussed from five aspects according to the different key processes involved in these reactions.

关键词： Domino reactions Polycyclic N-heterocycles Fused-ring systems Intramolecular hydroamination Alkynes Copper Cyclization Synthetic methods

Circulating tumor cells:from new biological insights to clinical practice

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Signal Transduction and Targeted Therapy 2024年第10期9卷 4178-4212页

作者： Xuyu Gu Shiyou Wei xin lv Department of Oncology Shanghai Pulmonary HospitalSchool of MedicineTongji UniversityShanghaiChina Department of Anesthesiology Shanghai Pulmonary HospitalSchool of MedicineTongji UniversityShanghaiChina

The primary reason for high mortality rates among cancer patients is metastasis,where tumor cells migrate through the bloodstream from the original site to other parts of the *** advancements in technology have significantly enhanced our comprehension of the mechanisms behind the bloodborne spread of circulating tumor cells(CTCs).One critical process,DNA methylation,regulates gene expression and chromosome stability,thus maintaining dynamic equilibrium in the *** hypomethylation and locus-specific hypermethylation are examples of changes in DNA methylation patterns that are pivotal to *** comprehensive review first provides an overview of the various processes that contribute to the formation of CTCs,including epithelial-mesenchymal transition(EMT),immune surveillance,and *** then conduct an in-depth analysis of how modifications in DNA methylation within CTCs impact each of these critical stages during CTC dissemination.

关键词： mortality metastasis insight

Upper Minus Total Domination Number of Regular Graphs

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Acta Mathematicae Applicatae Sinica 2017年第1期33卷 69-74页

作者： Zhen-lin LI xin-zhong lv Department of Mathematics Zhejiang Normal University Jinhua 321004 China

Let Гt-（G） be upper minus total domination number of G. In this paper, We establish an upper bound of the upper minus total domination number of a regular graph G and characterize the extremal graphs attaining the ... 详细信息

关键词： upper minus total domination regular graph

Laminar Flame Instability of n-Hexane,n-Octane,and n-Decane in Spherical Expanding Flames

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Journal of Thermal Science 2024年第3期33卷 1189-1199页

作者： YIN Geyuan HU Erjiang LI Xiaotian lv xin HUANG Zuohua State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong UniversityXi’an710049China United Automotive Electronic Systems Co. LtdShanghai201206China Chongqing Changan Automobile Co. Ltd.Chongqing401120China

This paper focuses on the laminar flame instability of three high molecular weight n-alkanes,namely n-hexane,n-octane,and *** experiment was carried out in a constant volume combustion bomb to get the flame *** critical radius under different conditions was extracted using the image processing *** with the existing critical Peclet number theory,the dominant factors of flame instability under current conditions for three n-alkanes can be figured ***,the average cell size(equivalent cell radius,R_(cell))was extracted to provide quantitative analysis of the flame cellular structure,based on the method developed in this *** theoretical R_(cell)were also calculated and compared with the experimental results to validate the proposed method.

关键词： cellular instability equivalent cell radius critical Peclet number spherical flame

Key issues in development of offshore natural gas hydrate

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Frontiers in Energy 2020年第3期14卷 433-442页

作者： Shouwei ZHOU Qingping LI xin lv Qiang FU Junlong ZHU State Key Laboratory of Natural Gas Hydrate CNOOC Research Institute Co.LtdBeijing 100028China Oil and Gas Reservoir Geology and Exploitation Chengdu 610500China

As a new clean energy resource in the 21st century,natural gas hydrate is considered as one of the most promising strategic resources in the *** paper,based on the research progress in exploitation of natural gas hydrate(NGH)in China and the world,systematically reviewed and discussed the key issues in development of natural gas *** an exploitation point of view,it is recommended that the concepts of diagenetic hydrate and non-diagenetic hydrate be *** main factors to be considered are whether diagenesis,stability of rock skeleton structure,particle size and cementation mode,thus NGHs are divided into 6 levels and used unused exploitation methods according to different *** study of the description and quantitative characterization of abundance in hydrate enrichment zone,and looking for gas hydrate dessert areas with commercial exploitation value should be *** concept of dynamic permeability and characterization of the permeability of NGH by time-varying equations should be ***‘Three-gas co-production’(natural gas hydrate,shallow gas,and conventional gas)may be an effective way to achieve early commercial *** great progress has been made in the exploitation of natural gas hydrate,there still exist enormous challenges in basic theory research,production methods,and equipment and operation *** through hard and persistent exploration and innovation can natural gas hydrate be truly commercially developed on a large scale and contribute to sustainable energy supply.

关键词： natural gas hydrate exploitation offshore diagenetic and non-diagenetic hydrate solid-state fluidization method dessert in enrichment area three-gas combined production on gas hydrate abundance

Asynchronous recruitment history of Abies spectabilis along an altitudinal gradient in the Mt. Everest region

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Journal of Plant Ecology 2012年第2期5卷 147-156页

作者： Li-xin lv Qi-Bin Zhang State Key Laboratory of Vegetation and Environmental Change Institute of BotanyChinese Academy of SciencesBeijing 100093China Graduate University of Chinese Academy of Sciences Beijing 100049China

Aims Forest growth and recruitment and their relationships to climate are *** aims of our study are(i)to examine the patterns in tree radial growth and recruitment along an altitudinal gradient in *** region and(ii)to identify the climatic factors that are responsible to the observed patterns in tree growth and *** Four plots,each 30360 m in size,were established from the lower to upper limits of the eastern Himalayan fir forest in Dingjie County of the *** Nature Reserve,*** techniques were applied to obtain information about the radial growth and age of the trees in the *** analysis was used to identify the relationships between radial growth and recruitment of trees and climatic variables,*** mean temperature and Palmer Drought Severity Index(PDSI).The population age structure was analyzed to investigate the recruitment *** Findings The timberline plot was characterized by significant tree recruitments in the recent three decades and sporadic recruitments in earlier *** other three plots showed recruitment pulses during 1880–1910 in Plot 3700 m,during 1870–80 and 1920–30 in Plot 3520 m and during 1900–40 in Plot 3410 *** recruitment of fir trees in the timberline was sensitive to summer(June–September)temperatures,but it was mainly controlled by episodic disturbances in lower *** radial growth in the upper two plots was positively correlated with previous winter and current August *** radial growth at the two lower plots was positively correlated with PDSI from previous September to current September.

关键词： tree rings tree recruitment age structure disturbance timberline dynamics

Ternary phase diagram of all-inorganic perovskite CsPbCl_(a)Br_(b)I_(3−a−b)nanocrystals

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Nano Research 2022年第8期15卷 7590-7596页

作者： xin lv Gaoyu Chen Xia Zhu Jiakun An Jianchun Bao Xiangxing Xu Jiangsu Key Laboratory of Biofunctional Materials Jiangsu Key Laboratory of New Power BatteriesSchool of Chemistry and Materials ScienceNanjing Normal UniversityNanjing 210046China

All-inorganic lead halide perovskite CsPbX3(X=Cl,Br,and I)nanocrystals(NCs)have shown great application prospects in optoelectronic *** properties can be feasibly tuned by the ratio of different halide ***-synthesis halide anion exchange of Cl‒Br or Br‒I in CsPbX3 NCs allows getting any desired composition of CsPbClxBr3−x and CsPbBr_(x)I_(3−x)(0≤x≤3).However,due to the large difference of the Cl and I radii,they can only substitute each other in a limited ratio to form CsPbCl_(y)I_(3−y)(0

关键词： all-inorganic perovskite nanocrystals anion exchange ternary phase diagram

Influence Factors of Aluminum–Slag Interfacial Reaction Under Electric Field

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Acta Metallurgica Sinica(English Letters) 2017年第8期30卷 753-761页

作者： xin-Yu lv An-Ping Dong Jun Wang Da Shu Bao-De Sun Shanghai Key Laboratory of Advanced High-Temperature Materials and Precision Forming Shanghai Jiao TongUniversity Shanghai 200240 China

The interfacial reaction between aluminum melt and molten slag under an electric field plays a significant role in aluminum electro-slag refining. Here we studied this interracial reaction within 680 and 820 ℃ under an electric field between 0 and 9 V. The evolution of aluminum composition was analyzed by inductively coupled plasma atomic emission spectroscopy. The dominant factor during the interfacial reaction was identified through orthogonal experiments, in which the slag-to-aluminum mass ratio, initial silicon concentration, electric voltage, reaction time, and temperature were selected as the influence factors. The greatest influence factor on the interracial reaction was found to be the reaction time. Also, single-factor experiments revealed that the reaction kinetic processes largely obeyed an irreversible kinetic model, and the silicon removal efficiency was enhanced by increasing the voltage and slag/metal ratio.

关键词： Molten salts Interfacial reaction Silicon Electric field Aluminum Kinetic model