利用水平井提高凝析气藏原油采收率(为庆祝塔里木油田石油会战20周年而作)

Enhancing Oil Recovery of Condensate Gas Reservoir by Horizontal Wells

采用水平井可以有效提高凝析气藏原油的采收率;利用水平井开发井网,先期开采底油、适时上返采气,可在不影响天然气采收率的前提下有效提高原油采收率;对英买7凝析气藏而言,将水平井部署在油气界面之上1～2m处、水平段长度300m、采油速度控制在2.5%以下进行开发,既不影响天然气采收率,又可以提高原油采收率。

This study shows that for condensate gas reservoir with bottom oil, utilizing horizontal well pattern, the oil recovery could be effectively enhanced by producing bottom oil followed by producing upper condensate gas without impacting the gas recovery. Taking Yingmai-7 condensate gas pool as an example, such an effectiveness could be reached by the process that the horizontal well is positioned at 1-2 m above gas-oil contact, with horizontal interval length of 300 m and the oil production rate less than 2.5%.