Abstract: Dazhangtuo is a gas condensate reservoir of high-content condensate and small oil ring.What kind of development method should be used to improve the condensate recovery? Many laboratory experiments and multi-component numerical modeling researches have been carried out.It has been 18 months since the gas cycling was started in January,1995.The decrease in GOR and stable effect have been achieved.It is expected that the condensate recovery would be largely enhanced to realize the improvement of condensate recovery factor from 35% to 60.2%.

Key words: gas condensate reservoir, gas well, well test, phase study, cycle gas injection, development

摘要： 对于凝析油含量高,并具有小油环的大张坨凝析气藏,对于采用什么样的开发方式可提高凝析油的采收率,进行了大量的室内实验和多组分数值模型研究,确定采用循环注气开发。于1995年1月开始循环注气,至今已正常注气18个月,见到了气油比下降并稳定的效果。预计可实现凝析油的采收率由35%提高到60.2%的开发方案。

关键词: 凝析气藏, 气井, 试井, 相态研究, 循环注气, 开发