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循环注气是提高凝析气藏开发效果及凝析油采收率的有效措施，而循环注气能否使已经存在于地层中的凝析油重新蒸发是人们普遍关注的问题。作者以柯克亚凝析气藏Ｘ４２—Ｘ５１层系为例，对循环注气开采过程中注入气对凝析油的再蒸发作用进行了数值模拟研究，并对Ｘ５１（３）循环注气试验区现场注气后的情况进行了具体分析，得出了凝析气藏循环注气可以使地层中的部分凝析油重新蒸发采出地面的结论。建议当地层压力低于露点压力时，采用保持压力循环注气开采，可提高凝析油的回收率。

EFFECT OF CIRCULATING GAS INJECTION ON REVAPORIZATION OF CONDENSATE IN GAS CONDENSATE RESERVOIR

??Circulating gas injection is an efficient measure for raising the development effectiveness of gas condensate reservoir and for enhancing condensate recovery factor.Whether the condensate in the reservoir could be revaporized by circulating gas injection is a problem concerned generally.By taking the Layers X₄²??X₅¹ in Kekeya gas condansate field as an example,the effect of gas injection on revaporization of condensate in the process of circulating gas injection production was studied by use of the method of numerical simulation and the spot situation after circulating gas injection in X₅¹ (3)at the experiment region was concretely analyzed.A conclusion that the circulating gas injection can cause a part of the condensate in gas condensate reservoir to be revaporized and recovered has been obtained.It is suggested that when formation pressure is lower than dewpoint pressure,circulating gas injection with maintenance of pressure can be used to enhance the recovery ratio of condensate.