大庆石油地质与开发2025，Vol.44Issue(5)：171-181,11.DOI:10.19597/J.ISSN.1000-3754.202504072
特高含水后期河道砂体微观剩余油成因分类及动用机制
Genesis classification and producing mechanism of microscopic remaining oil in channel sandbodies in late stage of ultra-high water cut
摘要
Abstract
Aiming at the unclear force mechanism in traditional microscopic remaining oil classification and the am-biguous driving force of remaining oil occurrance,research on microscopic remaining oil classification method and the producing mechanism based on the force characteristics is conducted via displacement coordinated CT scanning method and micro-scale flow simulation technique.Through the optimization of mechanical parameters and the divi-sion of classification limits based on displacement experimental data,a method for genisis classification of micro-scopic remaining oil is established to divide microscopic remaining oil into 5 types,including capillary pressure+viscous force controlled cluster type(Type A),capillary pressure+viscous force controlled oil-droplet type(Type B),viscous force controlled oilfilm type(Type C),capillary pressure controlled throat type(TypeD)and viscous force controlled blind end type(Type E).Occurrence state of microscopic remaining oil in channel sand bodies after high-multiple water flooding is clarified.Among them,microscopic remaining oil in large-sized channel sand body is dominated by Type B,which is distributed in macropores with high connectivity.Microscopic remaining oil in me-dium and small-sized channel sand body is dominated by Type A,which is mainly distributed in micropores and mesopores with high connectivity.Mechanisms for microscopic remaining oil production such as increasing pressure gradient,increasing shear force and reducing capillary resistance are also clarified.The research provides technical conditions for deep potential tapping of remaining oil in late stage of ultra-high water cut.关键词
河道砂体/驱替协同CT扫描实验/微观剩余油/赋存状态/特高含水后期/动用机理Key words
channel sandbody/displacement coordinated CT scanning experiment/microscopic remaining oil/oc-currence state/late stage of ultra-high water cut/producing mechanism分类
能源科技引用本文复制引用
郑宪宝,何宇航,王志强,邵帅,金凌萱,李汝斌..特高含水后期河道砂体微观剩余油成因分类及动用机制[J].大庆石油地质与开发,2025,44(5):171-181,11.基金项目
中国石油天然气股份有限公司攻关性应用型科技专项"中高渗油田特高含水期大幅度提高采收率技术研究"(2023ZZ22). （2023ZZ22）
