摘要
杜84块是曙一区超稠油主力含油区块,但目前普遍存在吞吐周期高、开发效果逐渐变差等问题。为了进一步提高杜84块超稠油的开发效果,在稠油油藏储层特征和原油渗流特性研究的基础上,通过数值模拟方法,优化了注入量、注入速度、注入次序、气体的注入比例、焖井时间、注入周期以及放喷速度等参数,预测了最佳开采方案。数值模拟研究表明:在杜84块采用先注N2再注CO2最后进行蒸汽吞吐开发方式开采,开发效果较好;注入参数为注汽速度为400t/d,注汽天数为5d,N2、CO2比例为1∶2,每周期注入蒸汽总量为2000t,吞吐周期时间为4个月,采液量为24m3/d,焖井时间为6d为最佳。
Block Du-84 was the main super-heavy oil-bearing block in Shu1 Region of Liaohe Oilfield.It had some problems,such as high stimulation cycle,development effect gradually worsen and so on.In order to further enhance the development effect,a numerical simulation was carried out in Block Du-84 super-heavy reservoir based on the study of the characteristics of heavy oil reservoir and oil flow.Through the method,the injection quantity,rate,order,the proportion of injection gas,shut-in time,injection cycle and spout pressure and forecasted the exploitation plan were optimized.Eventually,the result demonstrates the preferred recovery scheme is that in the mining process,it is good to inject N2 before CO2;the rate of steam injection is 400t/d;the steam injection is for 5d;the proportion of N2 and CO2 is 1:2;cyclic steam injection volume is 2000t;steam stimulation cycle is 4 months;fluid withdrawal rate is 24m3/d;shut-in time is 6d.
出处
《石油天然气学报》
CAS
CSCD
北大核心
2008年第05X期328-331,337,共5页
Journal of Oil and Gas Technology
关键词
超稠油
数值模拟
优化
开采方案
super-heavy oil
numerical simulation
optimize
recovery scheme
