气体混相驱影响因素及不同注入气特性分析

Analysis of influence factors of gas miscible flooding and characteristics of different injected gas

油藏注气开发作为近年来迅速发展的技术之一,其对于不宜注水的差物性油藏有着很明显的优势,能否开展注气混相驱油是需要对油藏各个方面的因素进行综合评价,实际油田上各个因素对混相驱的波及范围、最小混相压力、采收率等都有影响,通过从储层的温度、渗透率、非均质性等方面;原油的脱气程度、黏度、密度、组分等方面;不同注入气的特性这三大方面阐述了各个因素对混相驱的影响。

Gas injection development of oil reservoir is one of the rapid development technologies in recent years,it has obvious advantages for poor physical property reservoirs which are not suitable for water injection.Whether gas injection miscible flooding can be carried out depends on the comprehensive evaluation of various factors in the reservoir.In practice,various factors have influence on the sweep range,minimum miscible pressure and recovery factor of miscible flooding,from the aspects of reservoir temperature,permeability,heterogeneity,etc.The degree of degassing,viscosity,density and composition of oil,characteristics of different injected gases,the influence of each factor on the miscible flooding is discussed in the three aspects.