低渗透储层微观渗流特征及影响因素分析—以鄂尔多斯盆地华庆油田长6储层为例  

Micro-flow characteristics and influence factors of oil displacement efficiency in low permeability reservoirs

作　　者：陈强[1,2] 孙卫[1,2] 张相春[1,2] 霍磊[1,2] 曹雷[1,2] 

机构地区：[1]大陆动力学国家重点实验室,陕西西安710069 [2]西北大学地质学系,陕西西安710069

出　　处：《石油化工应用》2016年第1期51-55,79,共6页Petrochemical Industry Application

基　　金：国家科技重大专项"大型油气田及煤层气开发"基金资助项目;项目编号:2011ZX05044;陕西省科技统筹创新工程基金资助项目;项目编号:2011KTZB01-04-01

摘　　要：为研究鄂尔多斯盆地华庆油田长6储层微观渗流机理及驱油效率影响因素,此次研究采用真实砂岩模型水驱油实验,并结合铸体薄片、扫描电镜、恒速压汞及核磁共振等实验数据资料分析,结果表明:长6储层驱油效率整体较低,渗流特征有均匀驱替、网状-均匀驱替、指-网状驱替和指状驱替4种类型,驱油效率依次降低,研究区以网状-均匀驱替为主;储层物性、可动流体饱和度是表征驱油效率的主要参数;物性接近时,储层孔隙结构非均质性决定驱油效率高低;一定范围内,提高注入水倍数可以有效提高驱油效率;驱油效率随驱替速度增加而增加,驱替速度大于0.012 m L/min时,驱油效率基本稳定。In order to obtain the microscopic percolation mechanism and the influence factors of oil displacement efficiency of the Chang 6 reservoir in the Huaqing oilfield of Ordos basin,the study was based on the real sandstone micro-model water flooding experiment, and combined with the experimental date of thin slice,SEM,constant-speed mercury injection and nuclear magnetic resonance.The results show that the microscopic seepage paths of Chang 6reservoir include uniform displacement,mesh-uniform displacement,finger-mesh displace-ment and finger displacement,and their oil displacement efficiency reduced in turn.The mesh-uniform displacement is the main seepage paths and the final oil displacement efficiency is low of Chang 6 reservoir.Reservoir property and movable fluid saturation are the main parameters to characterize the oil displacement efficiency, and the heterogeneity of reservoir pore structure determines the efficiency of oil displacement when the reservoir property closed. It can effectively improve the oil displacement efficiency by increasing the injecting water volume in a certain range.Oil displacement efficiency increases with the increase of displacement velocity and will be stable when displacement velocity is greater than0.012 m L/min.

关 键 词：渗流特征 驱油效率 物性 孔隙结构 可动流体饱和度 驱替倍数 驱替速度 华庆油田 

分 类 号：TE312[石油与天然气工程—油气田开发工程]