数字重建孔隙结构内流体流动特性的计算研究
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摘要
数字岩芯技术可重建储层介质的复杂孔隙结构,是从微观尺度上研究多孔介质内渗流过程及渗流机理的重要手段。本文基于真实岩芯的CT扫描图像,通过降噪、阈值分割、二值化处理获得岩芯CT图像的三维数字矩阵,并根据矩阵信息对真实岩芯孔隙结构进行重建,并输出为后续处理软件易读取的通用文件格式。利用Fluent软件对重建岩芯结构中的单相流动现象进行了数值模拟,对流体在复杂通道结构内的流动特性进行了详细分析,并对岩芯试样的宏观渗流率特性进行了预测。计算结果表明,本文采用的方法可高效重建孔隙结构,并对真实岩芯的宏观渗透率特性做出合理预测。
Digital core technology could reconstruct the complex pore geometry and has become an important research tool for studying of seepage characteristics and mechanism in porous media from microscale viewpoints. Following the processes of denoising, threshold segmentation and image binaryzation, the CT images of a natural sandcore are converted to a three dimensional digital matrix,then the pore geometry is reconstructed and exported to common formatted files for post processing purpose. With help of the Fluent software, detailed numerical studies are carried out for single phase water flow characteristics in the reconstructed pore structure, based on which the macroscale permeability property of the porous media is obtained. It is concluded the method reported in this paper could reconstruct the complex pore geometry efficiently and predict properly the permeability of a natural core sample.
Digital core technology could reconstruct the complex pore geometry and has become an important research tool for studying of seepage characteristics and mechanism in porous media from microscale viewpoints. Following the processes of denoising, threshold segmentation and image binaryzation, the CT images of a natural sandcore are converted to a three dimensional digital matrix,then the pore geometry is reconstructed and exported to common formatted files for post processing purpose. With help of the Fluent software, detailed numerical studies are carried out for single phase water flow characteristics in the reconstructed pore structure, based on which the macroscale permeability property of the porous media is obtained. It is concluded the method reported in this paper could reconstruct the complex pore geometry efficiently and predict properly the permeability of a natural core sample.
引文
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[18]屈乐,孙卫,杜环虹,等.基于CT扫描的三维数字岩心孔隙结构表征方法及应用——以莫北油田116井区三工河组为例[J].现代地质,2014(1):190-196QU Le,SUN Wei,DU Huanhong et al.Characterization Technique of Pore Structure by 3D Digital Core Based on CT Scanning and Its Application:An Example from Sangonghe Formation of 116 Well Field in Mobei Oilfield[J].Geoscience,2014(1):190-196
[19]Song R,Liu J,Cui M.A New Method to Reconstruct Structured Mesh Model From Micro-computed Tomography Images of Porous Media and Its Application[J].International Journal of Heat and Mass Transfer,2017,109:705-715
[21]Tanikawa W,Shimamoto T.Comparison of Klinkenbergcorrected Gas Permeability and Water Permeability in Sedimentary Rocks[J].International Journal of Rock Mechanics and Mining Sciences,2009,46(2):229-238
[22]Peksa A E,Wolf K H A A,Zitha P L J.Bentheimer Sandstone Revisited for Experimental Purposes[J].Marine and Petroleum Geology,2015,67:701-719
[2]沈平平,江怀友,陈永武,等.CO_2注入技术提高采收率研究[J].特种油气藏,2007,14(3):1-4,11SHEN Pingping,JIANG Huaiyou,CHEN Yongwu,et al.Study on CO_2 Injection Technique in EOR[J].Special Oil&Gas Reservoir,2007,14(3):1-4,11
[3]王高峰,郑雄杰,张玉,等.适合二氧化碳驱的低渗透油藏筛选方法[J].石油勘探与开发,2015,42(3):358-363WANG Gaofeng,ZHENG Xiongjie,ZHANG Yu,et al.A New Screening Method of Low Permeability Reservoirs Suitable for CO_2 Flooding[J].Petroleum Exploration and Development,2015,42(3):358-363
[4]LAKE L W.Enhanced oil Recovery[M].New Jersey:Prentice Hall,1989
[5]HOLM L W,JOSENDAL V A.Mechanism of Oil Displacement by Carbon Dioxide[J].Journal of Petroleum Technology,1974,26(12):1427-1438
[6]Blunt M J.Physically-based Network Modeling of Multiphase Flow in Intermediate-wet Porous Media[J].Journal of Petroleum Science and Engineering,1998,20:117-125
[7]姚军,赵秀才,衣艳静,等.数字岩心技术的现状及展望[J].油气地质与采收率,2005,12(6):52-54YAO Jun,ZHAO Xiucai,YI Yanjing,et al.the Current Situation and Prospect on Digital Core Technology[J].Oil&Gas Recovery Technology,2005,12(6):52-54
[8]Quiblier J A.A New Three-Dimensional Modeling Technique for Studying Porous Media[J].Journal of Colloid and Interface Science,1984,98(1):84-102
[9]Hazlett R D.Statistical Characterization and Stochastic Modeling of Pore Networks in Relation to Fluid Flow[J].Mathematical Geology,1997,29(6):801-822
[10]Yeong C L Y,Torquato S,Reconstructing Random Media.Ⅱ.Three-Dimensional Media from Two-Dimensional Cuts[J].Physical Review E,1998,58(1):224-233
[11]赵秀才,姚军.数字岩心建模及其准确性评价[J].西安石油大学学报(自然科学版),2007,22(2):16-20ZHAO Xiucai,YAO Jun.Construction of Digital Core and Evaluation of Its Quality[J].Journal of Xian Shiyou University,2007,22(2):16-20
[12]Bakke S,Oren P E.3-D Pore-Scale Modeling of Sandstones and Flow Simulations in the Pore Networks[J].SPE Journal,1997,2(2):136-149
[13]Oren P E,Bakke S.Process Based Reconstruction of Sandstones and Predictions of Transport Properties[J].Transport in Porous Media,2002,46(2/3):311-343
[14]程国建,殷娟娟,刘烨,等.基于岩石铸体薄片图像的数字岩心三维重构[J].科学技术与工程,2015,15(18):16-21CHENG Guojian,YIN Juanjuan,LIU Ye,et al.3D Digital Rock Core Reconstruction Based on Casting Slice Image[J].Science Technology&Engineering,2015,15(18):16-21
[15]高慧梅,姜汉桥,陈民锋.储层孔隙结构对油水两相相对渗透率影响微观模拟研究[J].西安石油大学学报(自然科学版),2007,22(2):56-59GAO Huimei,JIANG Hanqiao,CHEN Minfeng.Simulation Study on the Effect of the Microscopic Parameters of Reservoir Pore Structure on Oil-water Relative Permeability[J].Journal of Xian Shiyou University,2007,22(2):56-59
[16]杜建芬,魏博熙,郭平.应用数字岩心对砂岩绝对渗透率研究[J].科学技术与工程,2016,16(23):166-172DU Jianfen,WEI Boxi,GUO Ping.Study on the Absolute Permeability of Sandstone with Digital Cores[J].Science Technology&Engineering,2016,16(23):166-172
[17]王晨晨,姚军,杨永飞,等.基于CT扫描法构建数字岩心的分辨率选取研究[J].科学技术与工程,2013,13(4):1049-1052WANG Chenchen,YAO Jun,YANG Yongfei,et al.Studyon Resolution Selection for Digital Rock Construction with CT Scanning Method[J].Science Technology&Engineering,2013.13(4):1049-1052
[18]屈乐,孙卫,杜环虹,等.基于CT扫描的三维数字岩心孔隙结构表征方法及应用——以莫北油田116井区三工河组为例[J].现代地质,2014(1):190-196QU Le,SUN Wei,DU Huanhong et al.Characterization Technique of Pore Structure by 3D Digital Core Based on CT Scanning and Its Application:An Example from Sangonghe Formation of 116 Well Field in Mobei Oilfield[J].Geoscience,2014(1):190-196
[19]Song R,Liu J,Cui M.A New Method to Reconstruct Structured Mesh Model From Micro-computed Tomography Images of Porous Media and Its Application[J].International Journal of Heat and Mass Transfer,2017,109:705-715
[21]Tanikawa W,Shimamoto T.Comparison of Klinkenbergcorrected Gas Permeability and Water Permeability in Sedimentary Rocks[J].International Journal of Rock Mechanics and Mining Sciences,2009,46(2):229-238
[22]Peksa A E,Wolf K H A A,Zitha P L J.Bentheimer Sandstone Revisited for Experimental Purposes[J].Marine and Petroleum Geology,2015,67:701-719