摘要
通过分析胜利油区弱边水普通稠油油藏处于蒸汽吞吐中后期所面临的问题及转常规蒸汽驱的不利因素,着重剖析了氮气泡沫辅助蒸汽驱的驱油机理,即泡沫不仅能够封堵蒸汽窜流通道,抑制蒸汽超覆,还能提高洗油效率。以孤岛油田中二北Ng5为例,利用CMG数值模拟软件,在室内物理实验的基础上,优化了在井距分别为141m×200m和100m×141m反九点井网的条件下,转氮气泡沫辅助蒸汽驱的时机、气液比、高温泡沫剂质量分数及注入方式的界限。模拟结果表明,对于吞吐转氮气泡沫辅助蒸汽驱,大、小井距关键参数的技术界限相近,采收率均有大幅度提高,比吞吐提高采收率15%以上。
The problems in the heavy oil reservoir with inactive edge water at middle-late stage of steam soaking were analyzed,and disadvantageous factors of changing into regular steam-flooding as well as.The oil displacement mechanism for enhancing recovery by using N_2 steam-foam flooding was analyzed deeply. The foam can not only block off steam channeling way and control steam overlapping,but also enhance oil displacement efficiency.Zhongerbei Ng5 was taken as an example,technology limits were optimized in different well-spacing(141m×200m and 100m×141m) by means of CMG numerical simulation, namely N_2 foam injection timing,gas-liquid ratio,high-temperature foaming agent concentration and the injection way based on the laboratory physical experiment.The result of the numerical simulation shows that the technology limits of the key parameters are similar at different well spacing,and the recovery efficiency of nitrogen steam assisted-foam flooding is higher 20%than that of steam stimulation.
出处
《油气地质与采收率》
CAS
CSCD
北大核心
2009年第3期68-70,共3页
Petroleum Geology and Recovery Efficiency
基金
中国石化重大先导项目"孤岛中二北Ng5高含水期化学蒸汽驱先导试验项目"
关键词
普通稠油
泡沫
蒸汽驱
注入时机
气液比
注入方式
general heavy oil
foam
steam flooding
injection timing
gas-liquid ratio
injection way
