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Microscopic flow simulation of shale multi-scale digital core based on image classification

International Journal of Heat and Mass Transfer 2025年 252卷

作者： Liang Zhou Hai Sun Lei Liu Lei Zhang Gloire Imani Jun Yao Yongfei Yang National Key Laboratory of Deep Oil and Gas China University of Petroleum (East China) Qingdao 266580 PR China Research Center of Multiphase Flow in Porous Media School of Petroleum Engineering China University of Petroleum (East China) Qingdao 266580 PR China BGPInc. China National Petroleum Corporation No.189 Fanyang West Road Zhuozhou Hebei 072751 China National Engineering Research Center of Oil&Gas Exploration Computer Software Sci-techPark Huayang EastRoad ZhuozhouHebei 072751 China

The shale reservoir is characterized by complex pore structures spanning nano- to micron-scale, with fluid flow behavior varying significantly across these scales. To address the challenges of simulating multi-scale flow in digital cores, this study develops a novel micro-flow simulation method based on automatic microstructure classification using the K-means clustering algorithm. By coupling pore-scale data from SEM-Maps and CT imaging, multi-scale digital cores were constructed and fluid flow simulation performed using the Darcy-Brinkman-Stokes approach. Results demonstrate that neglecting the multi-scale flow effect will underestimate the apparent permeability, particularly for cores with poor connectivity of micro-scale pores. Multi-scale simulations reveal pronounced permeability anisotropy, with horizontal and vertical permeability differing by two orders of magnitude due to the distribution of sub-resolution pores and micrometer-scale pores. This study highlights the critical role of sub-resolution pores and fracture geometry in accurately predicting flow behavior in shale reservoirs, offering insights for optimizing reservoir simulation and management strategies.

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Boosting CO2 electroreduction by iodine-treated porous nitrogen-doped carbon

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Chemical engineering Science: X 2020年 8卷

作者： Feng, Jiaqi Zeng, Shaojuan Jiang, Chongyang Dong, Haifeng Liu, Licheng Zhang, Xiangping Beijing Key Laboratory of Ionic Liquids Clean Process State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of Sciences Beijing100190 China College of Chemical Engineering University of Chinese Academy of Science Beijing100049 China Dalian National Laboratory for Clean Energy Dalian116023 China Qingdao Institute of Bioenergy and Bioprocess Technology Chinese Academy of Sciences Qingdao266101 China

Electrochemical carbon dioxide reduction reaction (CO2RR) provides a promising pathway for both decreasing atmospheric CO2 concentration and producing valuable carbon-based fuels. Exploring efficient and lower cost catalysts for CO2RR is of great importance, but still remains challenging. Herein, the iodine-treated porous N-doped carbon is fabricated as an efficient metal-free catalyst for CO2 electroreduction. The catalyst exhibits nearly 100% CO Faradaic efficiency with partial CO current density of 38.2 mA cm−2 at a low overpotential in ionic liquid electrolyte. A detailed study indicates that the pyrrolic N serves as the active site for CO formation. The iodine treatment not only enhances the electrochemical active surface area and decreases the interfacial charge-transfer resistance of the catalyst, but also increases the content of pyrrolic N that is confirmed as active site. This work presents an efficient strategy to explore highly efficient metal-free electrocatalyst for CO2RR, which has great application potentials. © 2020 The Authors

关键词： Ionic liquids

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Slug flow Characteristics in Inclined and Vertical Channels

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Fluid Dynamics & Materials Processing 2019年第5期15卷 583-595页

作者： Zhihui Wang Wei Luo Ruiquan Liao Xiangwei Xie Fuwei Han Hongying Wang Petroleum Engineering Institute of Yangtze University WuhanChina Laboratory of Multiphase Pipe Flow Gas Lift Innovation CenterChina National Petroleum CorpWuhanChina The Branch of Key Laboratory of CNPC for Oil and Gas Production Yangtze UniversityJingzhouChina Exploration Department of Petro China Tarim Oilfield Company KorlaChina The Third Drilling Company of Bohai Drilling Engineering Co. Ltd.of CNPCTianjinChina Research and Development Center Tuha Oilfield CompanyCNPCTulufanChina

Horizontal well production technology gradually occupies a dominant position in the petroleum *** the rise in water production in the later stage of exploitation,slug flow phenomena will exist in horizontal,inclined and even vertical sections of gas *** grasp the flow law of slug flow and guide engineering practice,the flow law of slug flow at various inclination angles(30°~90°)is studied by means of the combination of laboratory experiments(including high frequency pressure data acquisition system)and finite element numerical *** results reveal that because of the delay of pressure variation at the corresponding position of pipeline resulting from gas expansion,the highest point of pressure change curve corresponds not to the highest point of liquid holdup curve(pressure change lags behind 0.125 s of liquid holdup change).Thus,the delay of pressure should be highlighted in predicting slug flow using pressure parameter change;otherwise the accuracy of prediction will be affected when slug flow *** is generally known that liquid holdup and pressure drop are the major factors affecting the pressure variation and stable operation of ***,the results of finite element numerical simulation and Beggs-Brill model calculation are compared with those of laboratory *** numerical simulation method is applicable to predicting the pressure drop of the pipeline,while the Beggs-Brill model is more suitable for predicting the liquid holdup variation of the *** research conclusion helps reveal the slug flow law,and it is of a scientific guiding implication to the prediction method of flow parameters under slug flow pattern in the process of gas well exploitation.

关键词： Slug flow volume liquid holdup pressure pressure drop flow pattern numerical simulation

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Evolution of deposited carbon during multi-stage fluidized-bed reduction of iron ore fines

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Particuology 2018年第6期16卷 11-19页

作者： Zhan Du Qingshan Zhu Feng Pan Zheng Zou Zhaohui Xie Hongzhong Li State Key Laboratory of Multiphase Complex Systems Institute of Process EngineeringChinese Academy of SdencesBelting 100190China University of ChineseAcademy of Sciences Beijing 100049China

The influence of reduction conditions on carbon deposition during fiuidized-bed pre-reduction of iron ore fines was investigated *** results showed that reduction temperature and the composition of reducing gases had a significant effect on the rate of carbon deposition and the type of carbon deposits (graphite and Fe3C).Low reduction temperature,high CO content,and addition of H2favored the deposition of carbon,especially *** reduction conditions also significantly affected the surface morphology of the as-reduced iron ore *** the amount of deposited graphite increased,the formation of fibrous iron disappeared and graphite filaments were *** pre-reduced iron ore fines were further fiuidized in pure CO at 850℃ for final *** results showed that graphite could suppress the formation of fibrous iron and decrease the surface viscosity,thereby inhibiting agglomeration during the final high-temperature reduction *** that consume the deposited carbon during the final high-temperature reduction were identified and graphite was shown to be more reactive than *** enhance the application of fluidization technology in producing sponge iron,a novel solid-state high-temperature reduction method via deposited carbon was proposed and demonstrated to be feasible.

关键词： Carbon deposition Multi-stage fluidized-bed reduction Carbon deposits Surface morphology

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Efficient Capture and Low Energy Release of NH3by Azophenol Decorated Photoresponsive Covalent Organic Frameworks

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Angewandte Chemie 2024年第34期136卷

作者： Xiaoxin Tian Xiao Zhao Zhenzhen Wang Yunlei Shi Zhiyong Li Jikuan Qiu Huiyong Wang Suojiang Zhang Jianji Wang Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals Key Laboratory of Green Chemical Media and Reactions Ministry of Education (China) School of Chemistry and Chemical Engineering Henan Normal University Xinxiang Henan 453007 P. R. China School of Chemistry and Materials Engineering Xinxiang University Xinxiang Henan 453003 P. R. China Beijing Key Laboratory of Ionic Liquids Clean Process State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 P. R. China College of Chemistry and Molecular Sciences Longzihu New Energy Laboratory Henan University Zhengzhou Henan 450000 P. R. China

In NH 3 capture technologies, the desorption process is usually driven by high temperature and low pressure (such as 150–200 °C under vacuum), which accounts for intensive energy consumption and CO 2 emission. Developing light responsive adsorbent is promising in this regard but remains a great challenge. Here, we for the first time designed and synthesized a light responsive azophenol-containing covalent organic framework (COF), COF-HNU38, to address this challenge. We found that at 25 °C and 1.0 bar, the cis -COF exhibited a NH 3 uptake capacity of 7.7 mmol g −1 and a NH 3 /N 2 selectivity of 158. In the adsorbed NH 3 , about 29.0 % could be removed by vis-light irradiated cis-trans isomerization at 25 °C, and the remaining NH 3 might be released at 25 °C under vacuum. Almost no decrease in adsorption capacity was observed after eight adsorption-desorption cycles. As such, an efficient NH 3 capture and low energy release strategy was established thanks to the multiple hydrogen bond interactions (which are strong in total but weak in individuals) between NH 3 and the smart COF, as well as the increased polarity and number of hydrogen bond sites after the trans-cis isomerization.

关键词： ammonia capture Covalent Organic Framework (COF) photo switching azophenol

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Influence of dolomite additive on the ash fusion and potassium fixation characteristics of rice straw

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Ranliao Huaxue Xuebao/Journal of Fuel Chemistry and Technology 2020年第7期48卷 795-803页

作者： Yu, Zhi-Hao Jin, Jing Zhang, Rui-Pu Zhao, Bing Zhu, Yi-Zhou Wang, Guang-Xu School of Energy and Power Engineering University of Shanghai for Science and Technology Shanghai200093 China Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering Shanghai200093 China

The influence of dolomite as an additive on the slagging and potassium fixation characteristics of rice straw upon burning was investigated in a tube furnace;the slagging mechanism as well as the interaction between the rice straw ash and dolomite were explored by using the inductively coupled plasma optical emission spectrometry (ICP-OES) and X-ray diffraction (XRD). The results show that the slagging characteristics of rice straw are significantly influenced by adding 5% dolomite. Dolomite can greatly improve the potassium fixation ability, especially at 900-1000℃;moreover, the Mg and Ca elements rich in dolomite can react with SiO2 in the rice straw ash, forming high-melting silicate minerals including diopside, monticellite and merwinite. © 2020, Science Press. All right reserved.

关键词： Dolomite

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CO2 Electroreduction in Ionic Liquids： A Review

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Chinese Journal of Chemistry 2018年第10期36卷 961-970页

作者： Jianpeng Feng Shaojuan Zeng Jiaqi Feng Haifeng Dong Xiangping Zhang Beijing Key Laboratory of Ionic Liquids Clean Process Key Laboratory of Green Process and Engineering State Key Laboratory of Multiphase Complex System Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 China College of Chemical and Engineering University of Chinese Academy of Sciences Beijing 100049 China

The increasing emission of carbon dioxide （CO2） caused by the unrestrained consumption of fossil fuels in recent hundreds of years, has caused global environmental and social problems. Meanwhile, CO2 is a cheap, abundant and renewable Cl-feedstock, which can be converted into alco- hols, ethers, acids and other value-added chemicals. Compared with the thermal reactions, electrochemical reduction of CO2 is more attractive because of its advantages by using the seasonal, geographical and intermittent energy （tide, wind and solar） under mild conditions. In recent years, taking ionic liquids （ILs） as electrolytes in the CO2 electrochemical reduction reaction has been paid much more attention due to the advantages of lowering the overpotential of CO2 electroreduction and improving the Faradaic efficiency. In this paper, we summarized the recent progresses of electrochemical re- duction of CO2 in ILs electrolytes, and analyzed the reaction mechanism of CO2 reaction in the electrode-electrolyte interface region by experimental and simulation methods. Finally, the research which needs to be highlighted in this area was proposed.

关键词： ionic liquids CO2 reduction charge transfer electric double layer mechanism

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Reticulate collisional structure in boundary-driven granular gases

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Physical Review E 2019年第4期100卷 042908-042908页

作者： Yanpei Chen Wei Wang State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 China State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 China and University of Chinese Academy of Sciences Beijing 100049 People's Republic of China

We report a peculiar head-on collision network between two vibrating boundaries in experiments performed during a parabolic flight and in a laboratory using horizontal vibration. This structure is a new ordering, which is due to an orientation correlation between the relative position and velocity of any particle pair. It weakens the collision frequency and produces a long-range boundary effect. Moreover, we find the molecular chaos assumption is violated in a larger portion of the phase space. Using an anisotropic distribution model, we modify angular integration results and compare them to the results of the kinetic theory.

关键词： Granular gases Vibrofluidized granular materials

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An Optical Soot Particle Measurement Setup Based on CRDS and LII

An Optical Soot Particle Measurement Setup Based on CRDS and...

引用

Progress in Electromagnetics Research Symposium - Fall (PIERS - FALL)

作者： Jialuo Zhang Meng Wang Mingxu Su Huinan Yang Jun Chen Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering School of Energy and Power Engineering University of Shanghai for Science and Technology Shanghai China

ISBN: (数字)9781728153049

ISBN: (纸本)9781728153056

Based on laser-induced incandescence (LII) and cavity ring-down spectroscopy (CRDS), a measurement setup was established for the study of flame soot particles, and characterize the performance parameters. The measurement results of the path-integrated attenuation coefficient of soot particles show that the two-color LII test system and the CRDS system are independent of each other.

关键词： Cavity resonators Atmospheric measurements Surface emitting lasers Laser beams Optical attenuators Particle measurements Measurement by laser beam

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Modulating the mean residence time difference of wide-size particles in a fluidized bed

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Chinese Journal of Chemical engineering 2018年第2期26卷 238-244页

作者： Hu Zhao Jun Li Qingshan Zhu Hongzhong Li State Key Laboratory of Multiphase Complex Systems Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China

For non-catalytic gas-solid reaction, it is desirable to match the mean residence time （MRT） of particles and complete conversion time （tc） in a fluidized bed. In this study, the MRT differences （MRT ratios） between the coarse particles and the fine particles were investigated in a continuous fluidized bed with a side exit by varying the superficial gas velocity, feed composition and particle size ratio, The results show that the MRT ratio increases firstly and then decreases with increasing the gas velocity. By controlling the gas velocity and the feed composi tion of coarse particles, the MRT ratio can be modulated from 1.8 to 10.5 at the gas velocity of 1.0 m-s -1 for the binary mixture with the size ratio of 2.2. The MRT ratio can reach to - 12 at the gas velocity of 1.2 m. s for the particle size ratio of 3.3. The present study has endeavored to obtain fundamental data for an effective plant operation to meet the need of synchronously complete conversion of particles with different sizes during the film diffusion controlling reaction.

关键词： Fluidized bedMean residence timeWide size distributionBinarymixture

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