低渗透油藏CO_2吞吐参数的实践与认识

Practice and Recognition on the Parameters of Carbon Dioxide Huff-and-puff in Low Permeability Reservoirs and Its Application

低渗透油田应用CO2 吞吐可以提高油井产量和油藏采收率。从室内研究和矿场试验等方面对低渗透油藏开展CO2 吞吐进行深入的研究 ,详细分析了选井选层、注入量、注入速度、注入压力、返排速度、浸泡时间、吞吐周期和转抽防冲距等参数对CO2 吞吐效果的影响。结果表明 ,1 2口低渗透试验井累积注入CO2 3 91 6t,累积增油 2 888t,CO2 平均换油率 0 .74t/t,试验成功率不断提高。只要方法得当 ,该项技术具有投资少、风险小和见效快等特点 ,值得加大CO2

On the basis of laboratory study and field testing,the researches on carbon dioxide huff-and-puff in low permeability oil reservoir were made to analyse the effect of some parameters on carbon dioxide huff-and-puff,such as well,formation,injection rate,injection pressure,marination time.The results show that when accumulative injection rate of 12 testing wells is 3 916 t,accumulative adding production is 2 888 t.Accordingly,this technology is low-investment,low-risk and can bring good effects fastly,and should be further researched and applied in low permeability reservoirs.