论文部分内容阅读
在开发一个中等富气凝析油气藏时，出现油气井产量初期迅速下降，当气藏衰竭的产量又逐步上升的现象。油气藏组分模拟表明：生产早期，井筒附近的压力降到露点压力之下时就在井筒周围形成了凝析油环。环中较高的凝析油饱和度极大地降低了天然气的有效渗透率，导致气产量下降。等到整个气藏的压力降到露点压力以下时，整个气藏中都形成了凝析油，从而流进环中的天然气成为干气，这样就减少了环中的凝析油，使得天然气产量提高。
During the development of a medium-sized gas-filled condensate reservoir, the production of oil and gas wells decreased rapidly in the initial stage and the output of the depleted gas reservoir gradually increased. The simulation of reservoir components shows that, in the early stage of production, a condensate ring is formed around the wellbore when the pressure near the wellbore drops below the dew point pressure. The higher condensate saturation in the ring greatly reduces the effective permeability of natural gas, resulting in a decrease in gas production. By the time the pressure in the entire reservoir drops below the dew point pressure, condensate is formed in the entire gas reservoir, causing the natural gas flowing into the annulus to become dry gas, thus reducing the condensate in the annulus and increasing the production of natural gas .