芳48区块低渗透油田CO_2驱影响因素数值模拟

Numerical simulation of affecting factors of CO_2 flooding in low permeability reservoir of Fang 48 block

为提高低渗透油田采收率,应用Eclipse软件建立地层原油组分数值模拟模型,分析渗透率、原油相对密度、层内非均质性、层间非均质性及层内窜流通道等因素对CO2驱效果的影响.结果表明:随着渗透率的增加,CO2驱采出程度增大;随着原油相对密度的增加,CO2驱采出程度降低;层内非均质性和层间非均质性越强,窜流通道渗透率越高,CO2驱采出程度越低.为保证低渗透油藏实施CO2驱取得良好的开发效果,应选取均质、轻质且在垂向渗透率发育差的油藏或薄油层进行CO2驱.

Water injection in low permeability reservoirs proves to be difficult,it is necessary to enhance oil recovery with CO2 flooding.This paper mainly analyzes the affecting factors of CO2 flooding,which include permeability,relative density of crude oil,layer heterogeneity,interlayer heterogeneity,and layer fluid channeling by establishing the component numerical simulation model with the Eclipse software.The results show that degree of reserve recovery of CO2 flooding is increased along with the increase of permeability,the degree of reserve recovery of CO2 flooding is decreased along with increase of crude oil relative density,and the stronger the layer heterogeneity and interlayer heterogeneity,the higher the permeability of fluid channeling channel,the lower the degree of reserve recovery of CO2 flooding.Therefore,it is appropriate to carry out CO2 flooding for homogeneous and lightweight reservoirs in low permeability oil field,and the effect of displacement is better in vertical poor-permeability reservoir or oil sheet.