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Study of the Transport Behavior of Multispherical Proppant in Intersecting Fracture Based on Discrete Element Method

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Energy engineering 2025年第1期122卷 185-201页

作者： Chengyong Peng JianshuWu Mao Jiang Biao Yin Yishan Lou CNOOC Research Institute Company Limited Beijing100028China School of Petroleum engineering Yangtze UniversityWuhan430100China Hubei Key Laboratory of Oil and Gas Drilling and Production engineering(Yangtze University) Wuhan430100China

To analyze the differences in the transport and distribution of different types of proppants and to address issues such as the short effective support of proppant and poor placement in hydraulically intersecting fractures,this study considered the combined impact of geological-engineering factors on *** reservoir production parameters and the discrete elementmethod,multispherical proppants were ***,a 3D fracture model,based on the specified conditions of the L block,employed coupled(Computational Fluid Dynamics)CFD-DEM(Discrete ElementMethod)for joint simulations to quantitatively analyze the transport and placement patterns of multispherical proppants in intersecting *** indicate that turbulent kinetic energy is an intrinsic factor affecting proppant ***,the efficiency of placement and migration distance of low-sphericity quartz sand constructed by the DEM in the main fracture are significantly reduced compared to spherical ceramic proppants,with a 27.7%decrease in the volume fraction of the fracture surface,subsequently affecting the placement concentration and damaging fracture *** to small-angle fractures,controlling artificial and natural fractures to expand at angles of 45°to 60°increases the effective support length by approximately 20.6%.During hydraulic fracturing of gas wells,ensuring the fracture support area and post-closure conductivity can be achieved by controlling the sphericity of proppants and adjusting the perforation direction to control the direction of artificial fractures.

关键词： hydraulic fracturing discrete element method proppant sphericity CFD-DEM

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Macro-mechanics and Microstructure of Nanomaterial-modified Geopolymer Concrete: A Comprehensive Review

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Journal of wuhan University of Technology(Materials Science) 2025年第1期40卷 204-214页

作者： WANG Tao FAN Xiangqian GAO Changsheng QU Chiyu The National Key Laboratory of Water Disaster Prevention Nanjing Hydraulic Research InstituteNanjing 210024China Southern Marine Science and engineering Guangdong Laboratory(Guangzhou) Guangzhou 511458China School of Water Conservancy and Transportation Zhengzhou UniversityZhengzhou 450001China

We have described in detail the effects of nano-SiO_(2),nano-CaCO_(3),carbon nanotubes,and nano-Al_(2)O_(3) on geopolymer concrete from the perspectives of macro mechanics and *** existing research results show that the mechanism of nano-materials on geopolymer concrete mainly includes the filling effect,nucleation effect,and bridging effect,the appropriate amount of nano-materials can be used as fillers to reduce the porosity of geopolymer concrete,and can also react with Ca(OH)2 to produce C-S-H gel,thereby improving the mechanical properties of geopolymer *** optimum content of nano-SiO_(2) is between 1.0%and 2.0%.The optimum content of nano-CaCO_(3) is between 2.0%and 3.0%.The optimum content of carbon nanotubes is between 0.1%and 0.2%.The optimum content of nano-Al_(2)O_(3) is between 1.0%and 2.0%.The main problems existing in the research and application of nanomaterial-modified geopolymer concrete are summarized,which lays a foundation for the further application of nanomaterial in geopolymer concrete.

关键词： nanomaterials low carbon geopolymer concrete macro-mechanics microstructure

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STOCHASTIC PROCESS OF SEDIMENT IN SEDIMENTATION BASIN

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Journal of Hydrodynamics 1992年第4期4卷 66-71页

作者： Zheng, Bongmin Fang, Hongwei wuhan Univ of hydraulic and electric Engineering Wuhan China

Suspended movement is supported by eddy of river. In this paper the turbulent stochastic regularity of flow and sediment was adopted and the settling model of the suspended movement was established. Then, stochastic regularity of the sediment in sedimentation basin was investigated. The calculating results were compared with measured data. The results are in good agreement and the calculating method is very simple. The divided diameter of washload and bed material load was discussed from the relation of turbulent intensity and sediment settling velocity.

关键词： Flow of water Sediment transport Sedimentation Turbulence

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GRID GENERATION IN SPACE AND CALCULATION FOR 3-D TURBULENT FLOW

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Journal of Hydrodynamics 1991年第1期3卷 66-71页

作者： Zheng, Bong-min Chao, Ming-deng wuhan Univ of hydraulic and electric Engineering Wuhan China

In this paper we studied three dimensional flow with inlet and outlet. We used nonorthogonal curvilinear body-fitted coordinates for the governing equations and grid generation, and gave the physical components for velocity flow field. We used two scale k-Ε-E model for large and small vortices respectively. The computation gives U, V, W, P, T, K, Ε, seven variables. The numerical results of the velocity and temperature distribution agree with the practical data. This method can calculate the vortex, circulation and secondary flow and may be widely used in river flow and in environmental hydraulic problems.

关键词： Computers Applications Hydrodynamics Mathematical Models Mathematical Techniques Finite Element Method Rivers

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HYBRID FINITE ANALYTIC SOLUTION FOR THREE-DIMENSIONAL TIDAL FLOW WITH SIGMA COORDINATE SYSTEM

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Journal of Hydrodynamics 2000年第2期12卷 54-61页

作者： Huai, Wenxin Toshimitsu, Komatsu Li, Wei wuhan Univ of hydraulic and electric Engineering Wuhan China

A three-dimensional numerical model was developed to predict the behavior of tidal flow by using the σ-coordinate transformation. Conservation equations were solved by hybrid finite analytical techniques. The hydrodynamic model was verified with the analytical solutions for the tidal forcing in an open channel. The simulation results are in good agreement with the analytical solutions.

关键词： Computer simulation Hydrodynamics Mathematical transformations Models Numerical methods Three dimensional

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EXPERIMENTAL STUDIES OF SOLUTE TRANSPORT THROUGH AN UNSATURATED NATURAL SOIL

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Journal of Hydrodynamics 1996年第1期8卷 31-38页

作者： Ye, Zitong Yang, Jinzhong Jia, Weizhao Yan, Shilong wuhan Univ of hydraulic and electric Engineering Wuhan China

Salt (NaCl) solution was applied to the surface of a cultivated field with 3 × 6 m2 and then was leached downward by a steady infiltration rate 4 mm/d. Sampling programs were designed under guiding of Dagan's scale concept. Each soil sample had eight replicates. Salt concentration exhibited a much more variability in both vertical and horizontal directions than water content, especially in the zones of peak values of concentration. The volume of immobile water, which might play an important role in the variability of concentration, was in the range of 24-39% of the total water volume in the experimental studies.

关键词： Infiltration Salt water barriers Solutions Transport properties

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NUMERICAL ANALYSIS OF FLOWS OVER A WAVY SURFACE

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Journal of Hydrodynamics 1992年第4期4卷 72-77页

作者： Hu, Minliang wuhan Univ of hydraulic and electric Engineering Wuhan China

Potential and laminar flows over a wavy surface were studied in this paper. For the potential flow, theoretical analysis and FA numerical computation were adopted respectively. In the computation of the laminar flow, the body-fitted coordinate transformation were used. The results of two methods agree very well. The results show that the difference of the wall pressure distribution between potential and laminar flows is not significant, when the ratio of wave height to wave length is smaller and there are separated regions in the laminar flow field.

关键词： Laminar flow Numerical analysis Potential flow Wall flow

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BASIC EQUATIONS AND WAVE THEORY OF GAS-LIQUID TWO-PHASE TRANSIENT FLOW

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Journal of Hydrodynamics 1992年第1期4卷 83-90页

作者： Yang, Jiandong Wu, Rongqiao Chen, Jiznzhi wuhan Univ of hydraulic and electric Engineering Wuhan China

This paper systematically discussed the equations for two-phase transient flow and pressure wave and interfacial wave. The behaviour of basic equations was analyzed. The formulas for the wave speed of the pressure wave and the interfacial wave were derived. It was proved that various mathematical models can be uniformed by the integrating model and various wave speed formulas can be uniformed by the universal formula derived. The basic equations for the separated flow model are ill-conditioned because of the unreasonable neglect of the pressure differences between the phases and interfaces. Drift flux model can improve the accuracy if some additional equations are provided. The basic equations for homogeneous flow model are well-conditioned and they can be used in two-phase transient flow, especially in the cases of no velocity slips between various phases fluid.

关键词： wave theory two-phase flow mathematical model

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ON MUSHROOM-CLOUD AND SPREADING LAYER REGIONS OF PLANE BUOYANT JETS

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Journal of Hydrodynamics 1993年第1期5卷 35-41页

作者： Li, Wei Huai, Wenxin wuhan Univ of hydraulic and electric Engineering Wuhan China

The whole field of buoyant jets in stratified environment is divided into buoyant- jet region,mushroom-cloud region and spreading layer *** this paper a modelling method is used to predict the behaviors of mushroom-cl... 详细信息

关键词： plane buoyant jet stratified environment prediction

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STUDY ON THE CHARACTERISTICS OF LONG TERM DISCHARGE OF A CATCHMENT

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Journal of Hydrodynamics 2000年第2期12卷 31-41页

作者： Hong, Lin Takase, Keiji Sato, Koichi wuhan Univ of hydraulic and electric Engineering Wuhan China

The characteristics of the catchment discharge vary with land use. The characteristics of the long-term discharge of a terraced paddy field catchment were studied. Two kind of tank models for land use were proposed and used to simulate the discharge of the catchment: one is a forest type model used as the upper part of the catchment; the other is a paddy field type model used as the lower part of the catchment. The results of the model simulation were analyzed and compared with that of a forest catchment.

关键词： Discharge (fluid mechanics) Land use Models Tanks (containers)

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