致密储层水驱前缘特征数值模拟研究
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摘要
为明确致密储层中水驱前缘特征及其影响因素,根据渗流力学知识结合达西定律及连续性方程,结合三维数字岩心重构并截取二维轴向岩心切片,实现数值岩心与COMSOL Multiphysics软件进行数值模拟和分析水驱前缘特征。分别从注入速度和含油饱和度方面对影响水驱前缘特征进行分析,结果表明:在孔隙结构一定的情况下,得到水驱注入速度是影响水驱前缘特征的主要因素;水驱速度较小时,水驱前缘形态容易发生均匀驱替现象,但其驱油时间较长;水驱速度较大时,水驱前缘形态极易发生指进现象且残余油较多;水驱速度达到适中速度时,水驱前缘形态刚好达到活塞式驱替与指进驱替现象的临界状态,认为该状态下的驱替速度驱油效果最好。该研究对明确水驱前缘特征及探明影响因素具有积极意义。
For clear dense reservoir water drive front characteristics and its influencing factors,according to the seepage mechanics knowledge combined with darcy's law and continuity equation,combined with 3 d digital cores reconstruction and capture two dimensional axial slice,realizes the value core and COMSOL Multiphysics software to carry on the numerical simulation and analysis of characteristics of water drive front.Respectively from the injection rate and oil saturation of water drive front characteristics were analyzed,and the results show that in certain cases,the pore structure for water flooding injection rate are the main factors influencing the water drive front characteristics;The water drive speed is small,the water drive front shape is easy to occur even displacement phenomenon,but its oil drive time is long.When the water drive speed is large,the shape of water drive front edge is easy to be fingered and there are many oil residues.When the water drive speed reaches a moderate speed,the shape of water drive front edge just reaches the critical state of piston displacement and finger displacement phenomenon.This study is of positive significance in defining the characteristics of water drive leading edge and identifying the influencing factors.
For clear dense reservoir water drive front characteristics and its influencing factors,according to the seepage mechanics knowledge combined with darcy's law and continuity equation,combined with 3 d digital cores reconstruction and capture two dimensional axial slice,realizes the value core and COMSOL Multiphysics software to carry on the numerical simulation and analysis of characteristics of water drive front.Respectively from the injection rate and oil saturation of water drive front characteristics were analyzed,and the results show that in certain cases,the pore structure for water flooding injection rate are the main factors influencing the water drive front characteristics;The water drive speed is small,the water drive front shape is easy to occur even displacement phenomenon,but its oil drive time is long.When the water drive speed is large,the shape of water drive front edge is easy to be fingered and there are many oil residues.When the water drive speed reaches a moderate speed,the shape of water drive front edge just reaches the critical state of piston displacement and finger displacement phenomenon.This study is of positive significance in defining the characteristics of water drive leading edge and identifying the influencing factors.
引文
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[2]顾蒙,郭平,田东红,等.水驱油物理模拟相似准则研究[J].特种油气藏,2016,23(1):123-126.
[3]王冬欣.基于Micro-CT图像的数字岩心孔隙级网络建模研究[D].吉林:吉林大学,2015.
[4]闫国亮.基于数字岩心储层渗透率模型研究[D].山东:中国石油大学(华东),2013.
[5]张丽,孙建孟,孙志强.数字岩心建模方法应用[J].西安石油大学学报(自然科学版),2012,27(3):35-40.
[6]郑江韬.低渗透岩石的应力敏感性与孔隙结构三维重构研究[D].北京:中国矿业大学(北京),2016.
[7]李旭.基于LBM的致密砂岩渗流模拟研究[D].西安:西安石油大学,2015.
[8]刘晓旭,胡勇,朱斌,等.低渗砂岩气藏储层物性与孔喉结构分析[J].中外能源,2006,11(6):33-37.
[9]李旭,唐晓东,董金祥.图像分割技术的比较研究[J].中国人民公安大学学报(自然科学版),2009,15(2):37-40.
[10]屈乐,孙卫,杜环虹.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,2014,28(1):190-196.
[11]赵秀才.数字岩心及孔隙网络模型重构方法研究[D].山东:中国石油大学(华东),2009.
[12]赵永富,田恩龙,张国栋.达西定律与渗流控制[J].黑龙江水利科技,2008,36(4):65-65.
[13]王艳华,潘争伟,张劼.多孔连续介质渗透定律及其扩展[J].赤峰学院学报(自然版),2015,(7):32-34.
[14]Coker D A,Torquato S,Dunsmuir J H.Morphology and physical properties of Fontainebleau sandstone via a tomographic analysis[J].Journal of Geophysical Research:Solid Earth.I996.l0l(B8):17497-I7506.