塔河缝洞油藏特超稠油占有较大比例，随着油田的开发产量递减较快。为控制产量递减主要采取了两项措施，即注水替油和注氮气开采“阁楼油”。为进一步改善油田开发效果和提高油田采收率，近年开展了CO2室内相关实验和研究，同时结合实验和研究的成果，针对性开展了油田矿场的先导试验，对单一注CO2和氮气与CO2复合注入，以及不同复合注气方式优化进行了对比试验。室内实验和矿场试验取得了一致的结果，阶段成果证实CO2在塔河缝洞特超稠油油藏提高采收率有独特优势。
The reserve of the extra heavy oil account for a large proportion in the Tahe fractured vuggy carbonate reservoir. With the rapid decline in production,two primary measures are taken to make the development effect bet-ter,injecting water to take place oil and injecting nitrogen to recovery attic oil. In order to improve the development effect and the recovery ratio in Tahe oil field,pilot projects of CO2 EOR indoor tests and researches were conducted in recent years. At the same time,by combining the results of experiment and research,we conducted specific pilot test on reservoir in the field,and made different comparison and analysis through CO2 injection and N2&CO2 com-pound injection,and different methods of optimized composite injection,the laboratory tests and field tests yielded consistent results. The stage results showed that CO2 injection has distinct advantage for extra-heavy oil in the frac-tured-vuggy carbonate reservoir of Tahe oilfield.
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