提高凝析气藏采收率的新思路

我国目前的凝析气藏多属凝析油含量中偏低的饱和凝析气藏，且多采用衰竭方式开发，采收率低，有的已处于开发中、后期，如何提高凝析气井产量和气藏凝析油采收率已成为关键问题。在借鉴俄罗斯开发凝析气藏经验的基础上，着重介绍了４种提高凝析气藏采收率的开发方式：开发中后期低于最大反凝析压力下循环注干气；注N₂开发水淹气藏；防水、治水与利用地层能量相结合的水驱气藏开发方式；注水提高凝析气藏采收率。上述方法对于提高我国凝析气藏采收率具有指导与借鉴作用。

AN NEW IDEA ON ENHANCING THE RECOVERY RATE OF CONDENSATE GAS RESERVOIRS

Many condensate gas reservoirs in China are medium or low content condensate gases at present, and are usually explored by natural depletion and get low recovery efficiency. Some condensate gas reservoirs are in middle or late stage of development. So how to improve gas well production and condensate oil recovery efficiency has become an essential issue at present. Based on learning many experiences from Russia on the development of condensate gas reservoirs，this paper introduces the following four development schemes of enhancing the recovery rate of condensate gas reservoirs： a. recycle flooding dry gas into the reservoirs in the middle and late period of exploitation when the pressure is less than the maximum retrograde condensate pressure； b. Nitrogen flooding into the watered gas reservoirs； c. water drive development way combined with waterproof，water control and taking advantage of producing energy （formations）； d. water flooding to improve the recovery ratio of condensate gas reservoirs. These methods mentioned above will provide reference for China to enhance the recovery ratio of the condensate gas reservoirs.