高含水条件下CO_2混相驱替实验  

Displacement experiment of CO_2 miscible flooding under high water condition

作　　者：吕成远[1,2] 王锐[1,2] 崔茂蕾[1,2] 唐永强[1,2] 周霞 

机构地区：[1]中国石油化工集团公司海相油气藏开发重点实验室,北京100083 [2]中国石油化工股份有限公司石油勘探开发研究院提高采收率技术研究所,北京100083

出　　处：《石油学报》2017年第11期1293-1298,共6页Acta Petrolei Sinica

基　　金：国家重大科技专项(2016ZX05048-003)资助

摘　　要：油藏水驱后进行CO_2驱已在油田现场取得了成功,但由于油藏的高含水饱和度,导致了CO_2与原油间的接触方式发生改变,混相过程也受到一定制约。为研究高含水条件对CO_2混相驱的影响,制作了盲端微观可视化模型,进行了水驱前后CO_2混相过程微观实验。结合不同含水饱和度条件下的CO_2驱替实验,明确了CO_2混相驱替特征以及含水饱和度对CO_2驱油效率的影响。结果表明,高含水饱和度会对CO_2与原油的接触过程产生一定的屏蔽作用,注入的CO_2不能直接接触到剩余油,从而导致CO_2与原油的混相过程被大大延缓,进而导致高含水条件下CO_2驱见效时间被推迟。CO2 flooding has been successfully applied on site after water flooding.But due to the existence of high water saturation,the contact mode between CO2 and crude oil has been changed,and the development of miscible process is also restricted.Aiming at the influences of high water condition on CO2 miscible flooding process,the microcosmic visualization models of dead ends were prepared for the microcosmic visualiation experiment of CO2 miscible process before and after water flooding.In combination with CO2 flooding experiment under different water cut conditions,the characteristics of CO2 miscible flooding were clarified as well as the effects of water saturation condition on CO2 displacement efficiency.The results show that high water saturation will generate a certain shielding effect in the process of CO2 contacting with crude oil,and the injected CO2 is unable to contact residual oil directly.So the CO2-crude oil miscible process is greatly postponed,thus causing the delayed responding time of CO2 flooding under high water condition.

关 键 词：高含水条件 CO2驱 动态混相 盲端模型 驱替特征 

分 类 号：TE341[石油与天然气工程—油气田开发工程]