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凝析气藏常采用衰竭方式开发,随着气藏压力下降,低于露点压力后反凝析严重,产量递减加快,导致凝析油采收率降低。为此国内外大多选择注气保压开发来提高采收率,而凝析气藏注水开发则长期被认为是油气开发上的一个禁区。本文以大涝坝1号构造凝析气藏注水开发先导试验取得的效果及认识,阐述了对于规模小、储量低的小型凝析气藏,坚持边缘低部位注水原则,采用温和注水及间歇注水方式能够有效驱替地层中的凝析油,有效提高该类气藏的凝析油气采收率,在技术和经济上均具有一定的可行性。
Condensate gas reservoirs are often developed in a depletion mode. With the pressure drop of the gas reservoir, the anticoagulant is severely weakened after the dew point pressure, and the production decreases rapidly, resulting in a decrease in the recovery of condensate oil. To this end, most domestic and foreign choose to inject gas pressure and pressure development to improve oil recovery, and condensate gas reservoir water development has long been considered as a restricted oil and gas development. In this paper, the effect and cognition of the pilot experiment of condensate gas reservoir water injection in Dalaoba Dam No.1 are described. For the small condensate gas reservoirs with small scale and low reserves, the principle of water injection at the lower part of the edge is adhered to. The principles of gentle water injection and intermittent water injection The method can effectively displace the condensate in the formation and effectively improve the recovery rate of condensate gas in the gas reservoirs, which is technically and economically feasible.