低渗透油藏CO2吞吐参数的实践与认识

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,12口低渗透试验井累积注入CO23 916 t,累积增油2 888 t,CO2平均换油率0.74 t/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吞吐在低渗油藏中的研究和推广力度.

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

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.