用数值模拟研究低渗透油藏CO2 驱影响因素

低渗透油藏具有低丰度、低含油饱和度、低产等特点,经济有效开发难度较大。目前,“注气开发”是国内外针对低渗透油藏较为有效的开采方法。运用数值模拟器,确定了影响CO₂ 驱替效果的主要因素,用组分的劈分与拟合、状态方程的选取、实验数据回归等方法分析了CO₂驱替的影响因素及影响程度。研究结果表明：选用气水交替开发方式,并适度增加注入压力,选取合适的井底流压对增油和提高采收率效果明显。数模结果表明,不同井网井距、非均质性、裂缝方向、注气介质等是CO₂驱替的敏感控制因素,直接影响油藏开发指标和开发效果。

Influencing Factors of CO_2 Flooding in Low Permeability Reservoir with Reservoir Numerical Simulation

Low-permeability oil reservoirs have unique features of low abundance,low pressure,and low yield,their economic and effective exploitation are very difficult.Gas injection is the more efficient recovery method for such reservoirs at home and abroad.With numerical simulator,the main influencing factors affecting CO2 flooding are determined,including analysis of the components of split and fitting,selection of state equation and experimental regression,etc.The study results show that phase behavior simulation...