改善特低渗透油藏注二氧化碳驱油效果的方法

大庆外围扶杨油层为特低渗透、低流度和低产量的油层,在注水开发条件下无法有效动用.以芳48断块为对象,采用数值模拟技术,利用Eclipse软件研究改善注CO2驱油效果的方法.研究结果表明,超前注气能够提高油藏压力和初期产能,降低特低渗透油藏早期的产量递减;周期注气能够有效改善流度比,扩大CO2的波及体积,降低黏性指进的影...

Study on method for improving displacement effect of CO2 drive in extra-low permeability reservoir

Fuyang reservoir in the periphery of Daqing Oilfield is an extra-low permeability,low mobility and low production reservoir,so it can not be producted effectively by waterflooding.Taking Fang 48 fault as an example,the method to improve the displacement effect of CO2 drive is studied through using the numerical simulation and Eclipse software.The results show that the advanced gas injection can improve the reservoir pressure and initial productivity and reduce the rate of production declines during early production of extra-low permeability reservoir.Cyclic gas injection can improve the mobility ratio,expand the swept volume of CO2 drive and can reduce the influence of viscous fingering.Injection of light hydrocarbon slug can improve the miscible degree and increase the displacement efficiency.Gas injection of horizontal well can delay the gas breakthrough and increase the sweep area.The combination of these four measures can improve the development effect of CO2 drive and increase the recovery efficiency.