凝析气藏不同开发阶段的合理生产压差探讨

在凝析气藏的开发过程中，随着地层压力的不断下降，地层中会析出凝析油，严重影响气井的产能。但是，在凝析气藏衰竭式开发过程中，凝析油的析出是无法避免的，只能通过调整合理的工作制度来尽可能多地采出凝析油气。因此，基于实验和理论的方法研究凝析油气的渗流特征及毛管数效应对凝析油开采的影响，提出将凝析气藏衰竭式开采分为两个不同的阶段，按不同的开发阶段确定合理的生产压差。研究认为，对于定容封闭的凝析气藏可适当增大生产压差或采取变压差的方式来增加气井的产能以及凝析油的采收率，最后通过实际凝析气井的生产动态验证了以上的观点。

Research of Reasonable Producing Pressure Drop of Gas Condensate Reservoir on Different Period

During the development of gas condensate reservoir,the condensate would drop out with the fall of formation pressure. It would affect the deliverability of gas wells. However,during the depletion of gas condensate reservoir,the dropout of condensate is inevitable. We can only produce much more condensate by adjusting to reasonable working system. So,this paper researches the character of filtrate and the effect of capillary number on the production of condensate. We propose that there are two different periods of depletion of gas condensate reservoir and the determination of reasonable producing pressure drop is different in the two periods. The research results show that increasing or varying producing pressure drop can increase the deliverability of gas wells and the recovery of condensate for constant volume gas condensate reservoir. Finally,the above viewpoint is confirmed by the production performance of an actual gas condensate well. This research is of for the efficient development of gas condensate reservoir.