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An Integrated Optimization Method for CO_(2) Pre-Injection during Hydraulic Fracturing in Heavy Oil Reservoirs

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Fluid Dynamics & Materials Processing 2024年第9期20卷 1971-1991页

作者： Hong Dong Xiding Gao Xinqi Zhang Qian Wang Haipeng Xu Binrui Wang Chengguo Gao Kaiwen Luo Hengyi Jiang PetroChina Xinjiang Oilfield Company Karamay834000China National Key laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu610500China Department of Modern Mechanics University of Science and Technology of ChinaHefei230026China

CO_(2) pre-injection during hydraulic fracturing is an important method for the development of medium to deep heavy oil *** reduces the interfacial tension and viscosity of crude oil,enhances its flowability,maintains reservoir pressure,and increases reservoir drainage *** the Badaowan Formation as an example,in this study a detailed three-dimensional geomechanical model based on static data from well logging interpretations is elaborated,which can take into account both vertical and horizontal geological variations and mechanical characteristics.A comprehensive analysis of the impact of key construction parameters on Pre-CO_(2) based fracturing(such as cluster spacing and injection volume),is therefore ***,using optimized construction parameters,a non-structured grid for dynamic development prediction is introduced,and the capacity variations of different production scenarios are *** the basis of the simulation results,reasonable fracturing parameters are finally determined,including cluster spacing,fracturing fluid volume,proppant concentration,and well spacing.

关键词： Heavy oil reservoir pre-storage CO_(2)energy fracturing horizontal well fracturing parameters numerical simulation

Toughening Mechanism of Large Heat Input Weld Metal for Marine Engineering Extra-Thick Plate

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Journal of Shanghai Jiaotong university(Science) 2024年第2期29卷 349-360页

作者：冷俊杰邸新杰利成宁程尚华 School of Materials Science and Engineering Tianjin UniversityTianjin 300350China Tianjin Key laboratory of Advanced Joining Technology Tianjin 300350China Penglai Jutao Offshore Engineering Heavy Industry Co.Ltd. Yantai 265600ShandongChina

In order to study the latest designed large heat input welding material of marine engineering extra-thick plate,EH36 steel was joined by using twin-wire submerged arc welding with heat inputs of 85,100 and 115 kJ/cm ***,the microstructure and mechanical properties were evaluated to explore the toughening mechanism of weld *** show that a lot of active inclusions are obtained in the weld metal due to the design idea of low carbon and oxide metallurgy,which contributes to the generation of numerous fine and interlocking acicular *** acicular ferrite volume ratio of weld metal exceeds 60%.Moreover,the impact energy at-40℃ surpasses 115 J and the crack tip opening displacement value at-10℃ is more than 0.2 mm under three heat inputs owing to the role of acicular ferrite,of which 85 kJ/cm is the *** martensite-austenite constituents are minor in size and the microstructure of the weld metal in reheated zone is dominated by small massive equiaxed ferrite,without impairing the *** the heat input increases,the content of acicular ferrite drops and then rises;the impact toughness and fracture toughness first worsen consequently and then stabilize on account of the dramatic expansion of the proeutectoid ferrite size.

关键词： large heat input extra-thick plate weld metal acicular ferrite toughness

The role of low air pressure in the variation of negative corona-generated space charge in a rod to plane electrode

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High Voltage 2018年第2期3卷 126-132页

作者： Bian XingMing Zhu JunYu Yang Wei Wan ShuWei Qi Lei Li XueBao Li HaiBing State Key laboratory of Alternate Electrical Power System with renewable energy Sources North China Electric Power UniversityBeijing 102206People's Republic of China State Key laboratory of Advanced Transmission Technology Global Energy Interconnection Research InstituteBeijing 102211People's Republic of China State Grid Chongqing Nan'an Power Supply Company Chongqing 400060People's Republic of China

The corona-generated space charge may vary in different air pressures,and the quantitative law between the corona-generated space charge density and air pressure has never been *** work utilised computational approaches to explore the role of air pressure in the variation of negative corona-generated space charge.A negative fluid model in which the air pressure could be varied was built up to calculate the charged-particle density and electric field under different applied *** continuity equations were solved by flux corrected transport algorithm and the Poisson equation was computed by the successive over relaxation *** variations of important parameters due to air pressure were *** particles densities of electrons,positive ions and negative ions at standard and low atmosphere pressures were computed,which increased markedly due to the decrease of atmosphere *** fixed applied voltages,the exponential decay law between the maximal values of electron/positive ion densities at the head of the streamer and air pressure could be *** quantitative law between the maximal values of electron/positive ion densities at the head of the streamer and the applied voltage,relative air density was also achieved.

关键词： method charge maximal

Influence of bluff body shape on wall pressure distribution in vortex flowmeter

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Journal of Central South University 2013年第3期20卷 724-729页

作者：孙志强李志勇蒋赟周宏亮 School of energy Science and Engineering Central South University Hunan Key laboratory of energy Conservation in Process Industry(Central South University)

To investigate the influence of bluff body shape on wall pressure distribution in a vortex flowmeter,experiments were conducted on a specially designed test section in a closed water rig at Reynolds numbers of 6.2×10 4-9.3×10 *** cross sections of the bluff bodies were semicircular,square,and triangular shaped,and there were totally 21 pressure tappings along the conduit to acquire the wall *** is found that the variation trends of wall pressures are basically identical regardless of the bluff body *** wall pressures begin to diverge from 0.3D(D is the inner diameter of the vortex flowmeter) in front of the bluff body due to the diversity in shape,and all reach the minimum values at 0.3D behind the bluff body.A discrepancy between the triangular or square cylinder and the semicircular cylinder in wall pressure change is observed at 0-0.1D behind the bluff *** is also found that the wall pressures and irrecoverable pressure loss coefficients increase with flow rates,and the triangular cylinder causes the smallest irrecoverable pressure loss at a fixed flow rate.

关键词： vortex flowmeter bluffbody shape wall pressure irrecoverable pressure loss

Enhanced Water Resistance Performance of Castor Oil—Based Waterborne Polyurethane Modified by Methoxysilane Coupling Agents via Thiol-Ene Photo Click Reaction

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Journal of renewable Materials 2022年第3期10卷 591-604页

作者： Zhipeng He Junqi Xue Yanzi Ke Ying Luo Qiming Lu Yuehua Xu Chaoqun Zhang Key laboratory for Biobased Materials and energy of Ministry of Education College of Materials and EnergySouth China Agricultural UniversityGuangzhou510642China Guangdong laboratory for Lingnan Modern Agriculture Guangzhou510642China

Nowadays,waterborne polyurethanes(WPUs)prepared from renewable resources has attracted more and more ***,due to its structure,the prepared films easily swells in water and greatly affects the application range of ***,solving the problem of water resistance is a way to improve the application range of *** this study,a series of WPU dispersions were prepared using castor oil as the bio-based ***,the thiol-ene photo click reaction was carried out on the WPU films for silane *** effect of the silane modification on the chemical structures of the WPU dispersions and the properties of the WPU films was investigated and *** results revealed that the WPU dispersions had a smaller particle size and potential,showing excellent *** addition,the modified WPU films showed highly water resistance which 72 h water absorption could be reduced to 1.94%and the contact angle was up to 99.34?.Moreover,the modified WPU films also exhibited excellent solvent resistance(in acid and salt solution)and thermal *** study can provide a new way to improve the water-resistance,hydrophobicity,and thermal stability of bio-based waterborne polyurethane for potential application in painting,adhesives and inks.

关键词： Castor oil waterborne polyurethane water resistance silane modification

Experimental study of viscosity characteristics of hightemperature heat transfer molten salts

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Science China(Technological Sciences) 2011年第11期54卷 3022-3026页

作者： CHEN YongChang WU YuTing REN Nan MA ChongFang Key laboratory of Enhanced Heat Transfer and energy Conservation Ministry of Education and Key Laboratory of HeatTransfer and Energy Conversion Beijing Education Commission Beijing University of Technology Beijing 100124 China

In this paper several kinds of high temperature molten salts were investigated experimentally on viscosity-temperature characteristics with high-temperature *** viscosities of the molten salts were measured and compared with those from references to verify the reliability of the viscometer and measuring methods,and a good agreement was observed from the ***,two new high-temperature molten salts were made from the HITEC salt by some additives and the viscosity-temperature profiles of them were obtained by *** results show that the new molten salts have much lower viscosities,thus suitable for reducing the flow resistance in transportation system of high-temperature solar thermal power generation.

关键词： high-temperature molten salts viscosity temperature

Large-eddy simulation and experimental study on the turbulent wake flow characteristics of a two-bladed wind turbine

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Science China(Technological Sciences) 2017年第12期60卷 1861-1869页

作者： LUO Kun YUAN RenYu DONG XueQing WANG JianWen ZHANG SanXia FAN JianRen NI MingJiang CEN KeFa State Key laboratory of Clean energy Utilization Zhejiang University Hangzhou 310027 China School of energy and Power Engineering Inner Mongolia University of Technology Hohhot 010051 China Key laboratory of Wind and Solar Power energy Utilization Technology Ministry of Education and Inner Mongolia Construction Hohhot 010051 China

Large-eddy simulation(LES) with fully resolved rotor method(FRM) is applied to explore the turbulent wake flow characteristics and vortex evolution laws of a two-bladed horizontal-axis wind turbine. Relevant wind tunnel experiments have been done based on time resolved particle image velocimetry(TRPIV) technique. The simulation results are validated by the experimental data and they are in good agreement. The axial average velocity, turbulent kinetic energy, shear Reynolds stress, and vortex structure of the wind turbine wake are analyzed based on the comparison of LES results and experimental data. It is observed that the wake diameter of wind turbine enlarges with the increase of tip speed ratio(TSR). Turbulent kinetic energy meets its minimum value when x/R=2.0. Shear Reynolds stress appears a positive peak in the near wake when x/R<2.0, and the value of shear Reynolds stress decreases along the axial direction. The blade tip vortex dissipates more quickly than the central vortex in the wind turbine wake, and the gradient of the relationship curve between the blade tip vortex core position and the vortex age decreases as the TSR increases. With the increase of TSR, the thrust coefficient increases, and the power coefficient increases first and then *** present work proves that LES with FRM could calculate wind turbine turbulent wake flow with a high accuracy.

关键词： large-eddy simulation two-bladed wind turbine time resolved particle image velocimetry tip speed ratio turbulent kinetic energy shear Reynolds stress

A Storage and Transmission Joint Planning Method for Centralized Wind Power Transmission

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Computers, Materials & Continua 2021年第7期68卷 1081-1097页

作者： Xiuyu Yang Qi Guo Jianzhong Gui Renyong Chai Xueyuan Liu Key laboratory of Modern Power System Simulation and Control&renewable energy Technology(Northeast Electric Power University) Jilin132012China Electrical Engineering-PHD program at the University of Idaho Idaho83843America State Grid Jiangxi Power Supply Company Xinyu338025China

Centralized delivery has become the main operation mode under the scaled development of wind *** channels are usually the guarantee of out-delivered wind power for large-scale wind *** configuration of transmission capacity,which has the features of low utilization and poor economy,is hardly matching correctly due to the volatility and low energy density of *** usage of energy storage can mitigate wind power fluctuations and reduce the requirement of out-delivery transmission capacity,but facing the issue of energy storage cost ***,it is necessary to optimize the allocation of energy storage while considering the problem of wind power *** paper studies the joint optimization of large-scale wind power transmission capacity and energy storage,reveals the mechanism of energy storage in order to reduce the power fluctuation of wind power base and slow down the demand of ***,analyze the multi-functional cost-sharing mode of energy storage,improve the efficiency of energy storage cost *** the coordination optimization configuration model to deal with the problem of large-scale wind power transmission capacity and energy storage,and realizes the transmission capacity optimization coordination and optimization with energy *** proposed method is verified by a wind base located in Northeast China.

关键词： Wind farm group energy storage configuration transmission capacity coordination and optimization

Experimental study of the wake characteristics of a two-blade horizontal axis wind turbine by time-resolved PIV

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Science China(Technological Sciences) 2017年第4期60卷 593-601页

作者： ZHANG LiRu XING JiangKuan WANG JianWen YUAN RenYu DONG XueQing MA JianLong LUO Kun QIU KunZan NI MingJiang CEN KeFa School of energy and Power Engineering Inner Mongolia University of Technology Huhhot 010051 China Key laboratory of Wind and Solar Power energy Utilization Technology Ministry of Education and Inner Mongolia Construction Huhhot 010051 China State Key laboratory of Clean energy Utilization Zhejiang University Hangzhou 310027 China

Wind tunnel experiments of the wake characteristics of a two-blade wind turbine, in the downstream region of 0

关键词： two-blade wind turbine time resolved particle image velocimetry tip speed ratio wake characteristics leapfrogging phenomenon