摘要
针对复杂的油藏环境,利用高温高压微观可视化模拟系统,在60℃、18 MPa下进行CO2/水交替驱油实验,以便更直观、清楚地观察水、二氧化碳气体及CO2/水交替驱的驱油现象。通过观察水、二氧化碳气体和CO2/水交替驱油过程中多相流体的渗流过程及残余油分布状况,详细地描述多相流体在多孔介质中的运移特征,并应用图像处理技术和软件分析方法定量分析各阶段模型内残余油比例。结果表明,CO2/水交替驱油既克服了水驱替过程中的绕流现象,也降低了二氧化碳驱过程中气沿渗透性好的孔道、区窜进问题,使水、气驱替优势互补。CO2/水交替驱与二氧化碳驱相比提高采收率12.31%。从而为CO2/水交替驱油提高采收率技术进一步发展提供基础。
In this study, a high-temperature and high-pressure microscopic visualization model was used to simulate water flooding, CO2 flooding and water-alternating-gas （WAG） flooding using CO2 at 60℃ and 18 MPa in complex reservoirs. Multiphase fluid displacement features in porous media were described in detail by observing the multi-phase fluid flow and residual oil distribution in the process of water flooding, CO2 flooding and WAG flooding. The residual oil ratio at each process was quantitatively analyzed using image processing technology and software analysis. The experimental results show that WAG flooding not only decreased fluid alipstream in water flooding, but also reduced gas breakthrough along the high permeability pore in CO2 flooding. WAG flooding made the advantages of water flooding and C02 flooding complementary to each other, increasing the oil recovery by 12.31% compared with COL flooding.
出处
《科技导报》
CAS
CSCD
北大核心
2014年第36期80-85,共6页
Science & Technology Review
基金
北京市高校青年英才计划项目(2013012601601)
关键词
高温高压
微观可视化模拟
气/水交替驱油
提高采收率
high temperature and high pressure
microscopic visualization simulation
gas/water alternating flooding
improve the recovery efficiency
