大涝坝凝析气藏注气驱相态模拟

Simulation of Injection Phase Displacement of Condensation Gas Reservoir in Dalaoba

指出了大涝坝高含凝析油凝析气藏衰竭式开发过程中,当地层压力下降至低于露点压力,地层出现反凝析现象,特别是近井地带压降漏斗的存在,析出的凝析油更多,严重污染了井筒周围的储层,造成渗流阻力增大,致使气井产能递减快。结合数值模拟研究表明:注气能有效降低凝析气藏反凝析油的析出,改善其开发效果,为注气提高采收率提供理论依据。

the Dalaoba Reservoir belongs to the rich condensate oil saturated gas reservoir. In the depleted development process, when the formation pressure drops down the dew point pressure, there occurs retrograde condensate phenomena in the formation, especially due to the pressure drop occurs near the well bore, and filtrational resistance will increase, which results in the rapid declination of gas-well deliverability in gas well. Combined with the numerical simulation study, it has been proved that the gas injection can effectively reduce the precipitation of retrograde condensation for the gas condensate reservoir, and improve its development effectiveness. Therefore,it provides a theoretical basis for the gas injection enhanced oil recovery.