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Analysis of fracture propagation and shale gas production by intensive volume fracturing

Applied Mathematics and Mechanics(English Edition) 2023年第8期44卷 1385-1408页

作者： Qingdong ZENG Long BO Lijun LIU Xuelong LI Jianmeng SUN Zhaoqin HUANG Jun YAO College of Energy and Mining Engineering Shandong University of Science and TechnologyQingdao 266590Shandong ProvinceChina Research Center of Multiphase Flow in Porous Media China University of Petroleum(East China)Qingdao 266580Shandong ProvinceChina State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu 610500China College of Energy Chengdu University of TechnologyChengdu 610059China College of Geoscience China University of Petroleum(East China)Qingdao 266580Shandong ProvinceChina

This paper presents an integrated study from fracture propagation modeling to gas flow modeling and a correlation analysis to explore the key controlling factors of intensive volume *** fracture propagation model takes into account the interaction between hydraulic fracture and natural fracture by means of the displacement discontinuity method(DDM)and the Picard iterative *** shale gas flow considers multiple transport mechanisms,and the flow in the fracture network is handled by the embedded discrete fracture model(EDFM).A series of numerical simulations are conducted to analyze the effects of the cluster number,stage spacing,stress difference coefficient,and natural fracture distribution on the stimulated fracture area,fractal dimension,and cumulative gas production,and their correlation coefficients are *** results show that the most influential factors to the stimulated fracture area are the stress difference ratio,stage spacing,and natural fracture density,while those to the cumulative gas production are the stress difference ratio,natural fracture density,and cluster *** indicates that the stress condition dominates the gas production,and employing intensive volume fracturing(by properly increasing the cluster number)is beneficial for improving the final cumulative gas production.

关键词： fracture network propagation shale gas fow intensive volume fracturing displacement discontinuity method(DDM) embedded discrete fracture model(EDFM)

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Changing Conditions and Thermodynamic Transient Characterization of Therminol VP-1 Oil-Water Heat Exchanger

Changing Conditions and Thermodynamic Transient Characteriza...

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Power System and New Energy Technology Innovation Forum (NPSIF), Boao New Power System International Forum -

作者： Shuai Dong An Zheng Peng Wang Chaoyang Wang HUANENG YIMIN COAL-POWER CO. LTD. Hulunbuir China State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an China

ISBN: (数字)9798331504557

ISBN: (纸本)9798331504564

In this paper, the exergy efficiency of high-pressure heater feedwater in a coal-fired power generation thermal system heated with Therminol VP-1 as the thermal fluid is investigated, and the transient characteristics of the heat exchanger are analyzed after changes in heat transfer oil parameters. The results show that the exergy efficiency of Therminol VP-1 for heating feedwater tends to decrease as the unit load decreases. The exergy efficiency for heating high pressure heater feedwater was 80% to 90%, with a maximum of 90.3%. The time required to reach the new steady state after perturbation of the boundary parameters of the oil-water heat exchanger increased with the load rate, with a minimum of 200 s and a maximum of 500 s in the study range. the new steady state was reached more quickly with increasing load than with decreasing load.

关键词： Thermodynamics Technological innovation Oils Water heating Power system stability Thermal analysis Steady-state Transient analysis Heat transfer Turbines

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Evaluating the chemical kinetics of aluminium/alumina/water reactions using molecular dynamics

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Computational Materials Science 2025年 257卷

作者： Zhao, Hao Zhang, Yingjia Liu, Yuncong Huang, Zuohua State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University No.28 Xianning West Road Shaanxi Xi'an710049 China

Strength of aluminium in generating heat and hydrogen through water reaction highlight its potential as a green hydrogen carrier, but the formation of a passive oxide layer (alumina) inhibits further reactions thus hydrogen yield. This study employs reactive molecular dynamics (MD) simulations with the ReaxFF force field to investigate interactions between water and alumina-coated aluminium surfaces at temperatures ranging from 1000 K to 2500 K. Analysis of diffusion-driven reaction kinetics shows that hydrogen generation is primarily controlled by hydrogen atom diffusion within the aluminium bulk. Higher temperatures significantly accelerate both diffusion and reaction rates, shifting the mechanism from diffusion-limited to chemically controlled. Atomic-level reaction pathway analysis, using an in-house atom status tracing code, reveals the dynamic evolution of aluminium atom states. The results emphasize the roles of hydrogen and oxygen diffusion and indicate that O–H bond cleavage mainly proceeds through internal atomic diffusion. These findings offer detailed atomic-scale insight into the aluminium-water reaction, capturing both oxidizer diffusion and thermal effects. The study highlights the importance of thermal activation in enhancing reaction efficiency and safety, reinforcing aluminium's potential for green hydrogen production in carbon–neutral energy systems. © 2025 Elsevier B.V.

关键词： Rate constants

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Digital twin modeling and fault diagnosis on the feedwater pump system of thermal power plant

Digital twin modeling and fault diagnosis on the feedwater p...

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Digital Twins and Parallel Intelligence (DTPI), IEEE International Conference on

作者： Yugang Liu Chi Luo Chen Chen Zhu Wang Ming Liu Clean Combustion and Flue Gas Purification Key Laboratory of Sichuan Province Dongfang Boiler Co. Ltd Chengdu China State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an China

ISBN: (数字)9798350349252

ISBN: (纸本)9798350349269

The high penetration of renewable energy introduces increased volatility into the power system, presenting more challenging peak shaving and frequency modulation missions for thermal power plants that serve as schedulable power sources within the system. Frequent load cycling place higher demands on the operation stability of core power plant equipment and introduce additional safety risks. As the core system of the power cycle, the operational reliability and energy efficiency of the feedwater pump system (FPS) are crucial. Therefore, this paper focuses on the core equipment and parameters of the FPS, developing a digital twin model based on mechanism modeling method and neural network data-driven modeling method. By comparing the mean absolute error, root mean square error, and coefficient of determination of simulation parameters of different modeling methods, digital twin parameters with higher simulation accuracy were obtained. Utilizing these predicted parameters, an FPS fault diagnosis model (FFDM) for the FPS was developed. By calculating comprehensive deviation degree and the contribution of each parameter, fault early warning and source tracing were achieved, providing guidance for the closed-loop control.

关键词： Fault diagnosis Data-driven modeling Neural networks Predictive models Power system stability Energy efficiency Digital twins Safety Power system reliability Power generation

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Experimental Study on the Propagation Mechanism of Acetylene-Air Detonation Waves in a Unilaterally Intermittently Constrained Channel

SSRN

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SSRN 2024年

作者： Gai, Jingchun Qiu, Hua Xiong, Cha Zhao, Minghao He, Xinlu Yang, Zhan Feng, Zhiyuan Cehn, Xitao Huang, Zuohua School of Power and Energy Northwestern Polytechnical University Xi’an710072 China State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an710049 China

This study experimentally explores the propagation mechanisms of acetylene/air detonation waves within a channel intermittently constrained on one side, utilizing soot foil and high-speed schlieren photography to capture the cellular structure and shock-flame evolution. The experiments revealed that the detonation waves traverse the semi-enclosed channel with various discrete wall configurations on the side in four distinct propagation modes: (I) periodic detonation failure and re-initiation;(II) single extinction and re-initiation;(III) localized extinction and (IV) non-extinction. Mode I occurs exclusively when the open area ratio exceeds 0.85, while detonation tends to favour Mode II when the gaps between discrete walls exceed three times the cell size;otherwise, it tends towards Modes III and IV. The re-initiation mechanism of detonation involves curvature shocks inducing local explosions of reactive mixtures through multiple Mach reflections off the discrete walls. The self-sustained propagation mechanism of the detonation wave is maintained by the interaction of strong transverse shocks reflected from discrete walls with the inherent transverse waves within the detonation structure, sustaining the instability of the cellular detonation. © 2024, The Authors. All rights reserved.

关键词： Detonation

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Novel Catalyst Coatings on Gas Diffusion Layers for Improved Proton Exchange Membrane Water Electrolysis: A Microscopic Analysis of D-Orbital Electron Interactions in Co0.75Ru0.21Ir0.04O0.9

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SSRN 2024年

作者： Wang, Weiding Wang, Hao Zhang, Yan Yang, Suyi Wang, Baoyuan Dong, Wenxuan Li, Lubing Zhang, Lei Su, Jinzhan Guo, Liejin International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power Engineering School of Energy & Power Engineering Xi’an Jiaotong University Xi’an710049 China

Proton exchange membrane water electrolysis (PEMWE) has emerged as a reliable water splitting technology in recent years. The oxygen evolution reaction (OER) at the anode, is the rate-determining step in water electrolysis, and therefore, the kinetic and mass transfer performance of the oxygen evolution reaction should be further studied. Efficient electron and water transfer between the catalyst layer (CL) and gas diffusion layer (GDL) is crucial for optimizing PEMWE performance. In this work, Ru-core modified materials were successfully synthesized via a hydrothermal method and then spray-coated onto the surface of the gas diffusion layer. Physical and electrochemical characterization showed that 0.10 mg cm-2 was the optimal dosage of the coating. The single cell with this optimal coating exhibited a well-promoted and outstanding performance that a cell voltage of 1.71 V@1 A cm-2 and an overpotential of 222 mV@10 mA cm-2. This enhancement was primarily attributed to the improved ohmic and mass transfer properties. Specifically, the promotion of kinetic and mass transfer performance was due to the attraction of the empty d-orbitals of Ru, Co, and Ir, which enhanced electron transmission between the catalyst layer (CL) and gas diffusion layer. Physical analysis revealed that the reductive gaseous products caused Co (Ⅲ) to transform to Co (Ⅱ) and the formation of Co3O4 and RuO2 was well-protected by the Co (II)-rich Co3O4 phase due to its reductivity nature. Additionally, the effusion of gaseous products from the solid phase accelerated pore formation, thereby increasing the specific surface area of the material. © 2024, The Authors. All rights reserved.

关键词： Electrolysis

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Sub- and Supercritical Water Flooding for Enhanced Oil Recovery in High Water Cut Heavy Oil Reservoirs: An Experimental Study

SSRN

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SSRN 2024年

作者： Miao, Yan Zhao, Qiuyang Huang, Zujie Zhao, keyu Zhao, Hao Guo, Liejin Wang, Yechun State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an710049 China Xinjin Weihua Institute of Clean Energy Research Foshan528216 China

High water cut poses a formidable challenge for heavy oil reservoirs, necessitating a strategy to enhance oil recovery. This study introduces a green-efficient approach - Supercritical Water Flooding (SCWF), suitable for sandstone heavy oil reservoirs with high water cut, compared to conventional subcritical water flooding and steam flooding. A novel experimental system (450°C,30MPa) was established to conduct SCWF experiments for heavy oil from Shengli Oilfield. The results showed that SCWF at 400°C and 25MPa had the recovery factor of 96.27% and the viscosity reduction rate of 61.6% for GD heavy oil. The dynamic process of SCWF is divided into three stages: pressure rising drainage stage, heating and depressurization stage, and miscible flooding stage. Analysis indicates that the high diffusivity, solubility and reactivity of supercritical water make thermal fluid breakthrough, miscible flooding and aquathermolysis reactions become the key mechanisms for high oil recovery and in situ upgrading of SCWF for high water cut heavy oil reservoirs. © 2024, The Authors. All rights reserved.

关键词： Crude oil

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Data-Driven Surrogate Model for the Dynamic Characteristics of Supercritical Units

Data-Driven Surrogate Model for the Dynamic Characteristics ...

引用

Power System and New Energy Technology Innovation Forum (NPSIF), Boao New Power System International Forum -

作者： Shuai Dong An Zheng Junyao Jiang Wei Gao Ming Liu HUANENG YIMIN COAL-POWER CO. LTD. Hulunbuir China State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an China

ISBN: (数字)9798331504557

ISBN: (纸本)9798331504564

Coal-fired power generation units are characterized by large inertia, strong coupling, and high delay, making dynamic characteristic modeling inherently complex and computationally intensive. To address this, this paper utilizes GSE software to explore the dynamic characteristics of supercritical units. Data-driven approaches are then employed to develop surrogate model for these dynamics, comparing neural networks and support vector regression methods in the process. The study indicates that the surrogate model achieves a relative prediction error of less than 1% for live steam temperature, reheater steam outlet temperature, and power output. For live steam pressure and reheater steam outlet pressure, the model maintains a relative error within 10%.

关键词： Support vector machines Technological innovation Temperature Accuracy Computational modeling Power system dynamics Neural networks Predictive models Vectors Load modeling

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Alkaline Pulping Catalyzed Ordered Conversion of Bark in Supercritical Water

SSRN

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SSRN 2023年

作者： Ge, Hui Huang, Yong Liu, Zhaozheng Liu, Fan Chen, Yu-Nan Guo, Liejin State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University No.28 Xianning West Road Xi’an710049 China

The hydrophilicity of lignocellulosic biomass hinders the application of a high concentration slurry for supercritical water gasification, thereby reducing the efficiency of gasification and energy self-sufficiency. A pretreatment method of alkaline pulping with KOH and NaOH was proposed considering initial pressure to prepare high concentration slurry. In this study, bark as lignocellulosic biomass specimen, whose 30wt% and 40wt% slurries, with favorable rheology and stability, was prepared via alkaline pulping successfully. The most economical conditions were 180 °C and 24% KOH addition. The bark macromolecules were restructured due to the hydrolysis of cellulose and lignin by breaking down the hydrogen bond and ether bond with trivial hydrocarbon matrix loss. The scattered crystal growth being created and a reduction of hydrophilic groups facilitated the uniform premixing of bark and water, which is improved by a stable charge system furtherly. Additionally, metal ions could be deposited onto the bark surface during alkaline pulping. The chemical modification leading by alkaline pulping achieved the premixing of feedstock and water to form bark slurry. The conversion barrier was decreased to fulfill the ordered conversion. Consequently, the commendable catalytic effect of 95.66% gasification efficiency was displayed for 40wt% bark slurry with trivial coke yield. The functional groups of organic matter in the slurry were significantly converted into the gas phase, and lattice oxygen was produced in the solid product. The maximum alkali recovery of 80% was achieved at 580 °C. The successful completion of this research affirms the dominance of the pulping-alkali recovery-gasification method for expanding the application of SCWG of lignocellulosic biomass in large engineering projects. © 2023, The Authors. All rights reserved.

关键词： Chemical modification

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Simulation Study on the Dynamic Characteristics of Natural Circulation Coupled Phase Change Material for Equal Height Difference Passive Containment Cooling System

SSRN

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SSRN 2024年

作者： Chen, Weixiong Huang, Yufan Wang, Han Yang, Xiaohu Li, Shaodan Zhao, Quanbin Chong, Daotong State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an710049 China Wuhan Second Ship Design and Research Institute Wuhan430205 China

The passive containment cooling system (PCCS) plays a significant role in ensuring the safety of nuclear power plants. To further reduce peak pressure in the containment during a loss of coolant accident (LOCA), phase change materials (PCMs) are utilized to improve the system’s cooling effectiveness. The dynamic simulation model of PCCS has been developed using Apros software. This article focuses on examining the system’s dynamic characteristics related to various tube startup methods and comparatively analyzing the impact of different PCM thicknesses on heat transfer capacity. The results indicate that post-accident, PCM significantly suppresses peak pressure in the containment. Under the full tube startup method with 4 mm PCM, the peak pressure decreases to 1.75 MPa, whereas under the empty tube startup method, it is reduced to 1.69 MPa. With natural circulation empty tube startup method, PCM can reduce pressure change intensity in the containment but negatively affects natural circulation heat transfer. Although the full tube startup method underperforms the empty tube startup method on suppressing peak pressure, PCM can positively affect natural circulation heat transfer in the early stages of the accident. Empty tube startup offers the advantages of higher heat transfer capacity and lighter weight, making it the optimal choice for ocean nuclear platforms. Additionally, the higher peak power of PCM heat transfer under the empty tube startup method indicates that system can withstand larger thermal shocks. © 2024, The Authors. All rights reserved.

关键词： Thermoelectric equipment

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