摘要
针对渤海NB35-2海上稠油(油藏温度下1580mPa.s)油田提出以物理降黏和提高驱替介质黏弹性为主,同时降低界面张力至10-2mN.m-1的SPG复合驱(SPG即表面活性剂,KYPAM和自生CO2体系)技术。模拟NB35-2油田物性和流体性质,通过SPG体系动态黏弹性实验、可视化岩心驱替实验和宏观岩心驱替实验,对渤海稠油冷采做了可行性研究。结果表明,在SP体系中加入少量自生CO2体系,就可以使体系不但具有SPG和CO2驱的优点,而且可以通过二氧化碳在原油中的溶解降低稠油的心度,通过SP与自生二氧化碳体系的协同作用能提高SPG体系的黏弹性,大大改善油水流度比和提高微观驱油效率。
To aim at offshore heavy crude oil of Bohai bay,this paper put forward SPG combination flooding technique which is base on decreasing viscosity of crude oil by physical method,enhancing viscoelasticity of displacing medium and decreasing interfacial tension to 10-2mN.m-1.The majority of experiments,such as dynamic viscoelasticity experiment of SPG system,visible core flooding experiment,and macroscopic core flooding experiment,have been conducted to make sure if the SPG system is feasible to develop heavy crude oil by means of imitating reservoir characteristics and fluid quality of NB35-2 oil field.The results showed that displacing medium not only has the advantage of SP and CO2 flooding but also decrease the viscosity of heavy crude oil depending on solution of CO2 in heavy crude oil if we add little in-situ CO2 system in SP.Improving mobility ratio and microscopic oil displacement efficiency were realized by means of increasing viscoelasticity of SPG.
出处
《钻采工艺》
CAS
北大核心
2009年第5期91-93,97,共4页
Drilling & Production Technology
关键词
稠油油藏
SPG复合驱
流度比
黏弹性
提高驱油效率
heavy crude oil reservoir,SPG combination flooding,improving mobility control,enhancing viscoelasticity,enhancing oil displacement efficiency
