CO2混相驱与常规天然气驱开采特征对比分析  

Comparative Analysis of CO2 Miscible Flooding and Conventional Natural Gas Flooding

作　　者：涂向阳 TU Xiang-yang(College of Geophysics and Petroleum Resources,Yangtze University,Hubei Wuhan 430100,China)

机构地区：[1]长江大学地球物理与石油资源学院,湖北武汉430100

出　　处：《当代化工》2020年第5期956-960,共5页Contemporary Chemical Industry

基　　金：国家科技重大专项“大型地层油气藏形成主控因素与有利区带评价”基金项目,项目号:2017ZX05001-001

摘　　要：综合室内实验和数值模拟方法对CO2混相驱和常规天然气驱两种开采方式在驱油过程中流体性质、相图的变化、混相带的形成过程及流动特征进行对比分析,更直观、可靠地对比研究了两种开采方式的开采特征及渗流特征,并对两种开采方式的开采效果进行了比较。研究结果表明:CO2混相压力小于天然气,对注入气与剩余油混合物体系液相收缩率的影响大于天然气,对流体性质的影响要小于天然气,与地层剩余油体系流体配伍性好。结合柯克亚X52高水淹挥发性油藏目前存在的开采难题,将CO2混相驱应用到该油藏,目前油藏压力满足混相驱技术界限,CO2混相驱能够大幅度提高油藏采收率,为柯克亚X52油藏混相驱的成功实施提供了可靠依据。The fluid properties,phase diagram changes,the formation process and flow characteristics of the CO2 miscible flooding and conventional natural gas flooding in the oil displacement process were compared and analyzed by comprehensive indoor experiment and numerical simulation method.The recovery characteristics and seepage characteristics of the two recovery methods were studied,and the recovery effects of the two methods were compared.The results showed that the CO2 miscible pressure was lower than that of natural gas,and had greater influence on the liquid phase shrinkage of the injected gas and residual oil mixture system than natural gas;The effect of the CO2 on the fluid properties was less than that of natural gas.It had good fluid compatibility with the remaining oil system of the formation.Aiming at existing problems of X52 high-flooded volatile oil reservoirs,CO2 miscible flooding is used in the reservoir.At present,the reservoir pressure meets the boundaries of the miscible flooding technology,and the CO2 miscible flooding can greatly improve the oil recovery of the reservoir,which can provide a reliable basis for successful implementation of X52 reservoir miscible flooding.

关 键 词：挥发性油藏 CO2混相驱 天然气驱 渗流特征 数值模拟 

分 类 号：TE375[石油与天然气工程—油气田开发工程]