反凝析污染对凝析气井伤害的实验评价研究

反凝析污染对凝析气井的伤害是开发凝析气藏将要遇到的一个非常重要的问题，它会降低凝析气井产能，同时也使凝析油采收率下降，文章对影响凝析气井产能的因素进行了分析，给出了一种实验测定反凝析污染对凝析气井伤害程度的有效方法，利用该方法对塔里木油区凝析气井的反凝析污染伤害进行了实验评价研究，结果表明反凝析污染对凝析气井的伤害使渗透率几乎下降了一半，通过向井底注入盆气和关井恢复井底压力有助于消除反凝析污染对凝析气井的伤害。

LABORATORY EVALUATION AND STUDY OF CONDENSATE GAS WELL DAMAGE CAUS ED BY RETROGRADE CONDENSATION CONTAMINATION

The condensate gas well damage caused by retrograde condensation contamination is a very important problem met in the condensate gas reservoir development,which makes the productivity of condensate gas well and the condensate recovery efficiency reduce.In this paper,the factors affecting the productivity of condensate gas well are analyzed and an effective method for laboratory determination of the condensate gas well damage degree ca used by retrograde condensate contamination is given out.By use of this method,t he laboratory evaluation and study of the condensate gas well damage caused by r etrograde condensation contamination in Talimu petroleum region are conducted,wh ich shows that the permeability reduced twice as much due to the condensat e gas well damage by retrograde condensation contamination.Injecting dry gas int o the wellbore and buillding up the bottom hole pressure by shutting in well w ill contribute to eliminate the damage to condensate gas wells due to retrograde condensation contamination.