摘要
针对二氧化碳驱过程中产出的大量富含二氧化碳的伴生气回收利用的问题,开展了产出气直接压缩回注对驱油效果影响的研究,并分析其影响机制。以胜利油区正理庄油田高89块二氧化碳驱为例,采用经典的长细管法,测定该油田地层原油与二氧化碳的最小混相压力,在此基础上,利用长岩心物理模拟手段,测试了纯二氧化碳混相驱的驱油效率和矿场不同阶段产出气的驱油效率。结果表明:当产出气中二氧化碳含量为72.59%时,其驱油效率可达76.9%,基本达到纯二氧化碳混相驱的效果。同时,根据对不同阶段产出气的组分分析结果,探讨其组分特点对驱油效率的内在影响机制,研究认为,二氧化碳驱油藏产出气无需提纯而直接回注是可行的,为二氧化碳驱中后期大量产出气的处理提供了新的、可行的解决方法。
Impact of compression and reinjection of the produced gas on displacement efficiency was studied and its mecha？nism was analyzed to solve the problem of how to recycle and make use of the large amount of CO2-rich associated gasesduring CO2 flooding. Based on CO2 flooding pilot test in Gao89 Block of Zhenglizhuang oilfield of Shengli oil province,theminimum miscibility pressure（MMP）between formation oil and CO2 was measured by long slim tube test method. The dis？placement efficiency of CO2 miscible flooding was determined by long core displacement experiment using pure CO2 andproduced gases at various stages. The results show that when the CO2 content is 72.59%,the displacement efficiency is upto 76.9%,similar to that of pure CO2 miscible flooding. Moreover,the components of produced gas at different stages wereanalyzed,and the influence mechanism of gas composition on the displacement efficiency was investigated. The results sug？gest that the produced gas during CO2 flooding can be directly reinjected without purification. It provides a new and feasiblesolution to treat produced gas in the middle and late period of CO2 flooding.
出处
《油气地质与采收率》
CAS
CSCD
北大核心
2016年第3期72-76,共5页
Petroleum Geology and Recovery Efficiency
基金
国家科技支撑项目"CO_(2)驱油藏工程及注采工艺关键技术研究"(2012BAC24B03)
关键词
二氧化碳驱
产出气
最小混相压力
长细管实验长岩心驱替实验
驱油效率
CO_(2) flooding
produced gas
minimum miscibility pressure
long slim tube test
long core displacement experiment
oil displacement efficiency
