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消耗式开发的水驱凝析气藏,在开发中后期因地层压力下降,必然引起凝析油反凝析和边底水的侵入,地层中液相饱和度的增加,使储层中由单相流(气相)变成了多相流(油、气、水),极大地降低了含气饱和度和气相相对渗透率,从而导致气井产能急剧下降,造成携液能力降低而产生井筒积液,井筒积液又抑制气井的产气能力,导致气井停喷。要使气井恢复生产,必须排除井筒及地层中过多的积液,目前最有效的办法就是排水采气,通过对陆上复杂断块凝析气田成功的排采经验进行归纳总结,结合海上相似气田实际情况,进行了海上凝析气田排水采气工艺探讨,对于为海上凝析气田排水采气提供有益的参考。
Constructed water-driven condensate gas reservoirs, due to the decrease of formation pressure in the middle and late stages of development, inevitably lead to anticoagulation of condensate oil and intrusion of edge water. The saturation of liquid in the formation increases, Phase flow (gas phase) becomes multiphase flow (oil, gas, water), greatly reducing gas saturation and gas relative permeability, resulting in a sharp drop in gas well productivity, resulting in a decrease in liquid carrying capacity resulting in wellbore effusion , Wellbore fluid and inhibit gas production capacity, leading to gas well stop spraying. At present, the most effective method to drain gas is to remove gas from the wellbore and formation. The successful experience of gas drainage in the condensate gas field of complex fractured blocks on the land is summed up. Combining with the similar offshore Gas field actual situation, carried out on the sea condensate gas drainage drainage gas exploration process, for the condensate gas drainage on the sea provide a useful reference.