低渗凝析气井有效生产时间确定方法

随着地层压力下降,凝析气藏反凝析油会在井底周围聚集并对地层渗透率造成污染与伤害,严重时会影响凝析气井正常生产.基于凝析油气体系在恒温条件下的反凝析渗流理论,在研究了凝析油饱和度分布特征及油气多相渗流特征分析方法、综合分析了凝析气井各种约束条件的基础上,研究了考虑凝析油污染条件下凝析气井生产动态理论与方法,提出了一种预测凝析气井有效生产时间的新方法.实例计算表明,该方法预测的凝析气井有效生产时间与凝析气井实际有效生产时间基本一致,该方法具有一定的可靠性和实用性.

A Method to Determine the Effective Production Time of Low Permeability Condensate Gas Well

With the decline of the pressure, the retrograde gas condensate in gas condensate reservoir will be accumulated near the wellbore, which would cause the formation permeability damage. Even more which will influence the normal production of gas-condensate well. Based on the transfusion theory for a gas-condensate system at a constant temperature, the saturation distribution characteristic of gas condensate and multinomial infiltration flow characteristic were studied in the paper. At the same time, after analyzing different kinds of constraint condition of gas-condensate well, the production performance theory and means of gas-condensate well at considering condensate pollution condition were also discussed, and a sort of new method which can forecast gas-condensate well Horner time was derived. The application results showed that the result of Horner time of gas-condensate well got from this paper was accordant with the practical Horner time, it indicated that the approaches in this paper are reliable and practicable.