萨尔图油田北二西试验区弱碱体系三元复合驱数值模拟

Numerical simulation of Alkalescence-surfactant-polymer flooding in the test area of the North-Two-West,Saertu Oil Field

利用数值模拟方法,建立大庆萨尔图油田北二西试验区油藏的地质模型和化学驱模型,模拟主段塞、副段塞、前置段塞和后置段塞的弱碱、表面活性剂和聚合物三元复合体系化学剂质量分数、段塞注入体积孔隙倍数及矿场注入速度等因素对驱油效果的影响.结果表明:主段塞中弱碱和表面活性剂的质量分数对采收率的影响显著,采收率可达到最大值的范围.无论是三元主段塞还是副段塞,增加聚合物的质量浓度,对提高采收率的贡献很明显.各段塞注入体积孔隙倍数对驱油效果都有不同程度的影响.

The effect of chemical concentration,slug size and injection rate on the enhanced oil recovery by alkali-surfactant-polymer flooding system with main slug,auxiliary slug,pre-positioned slug and post-positioned slug is analyzed with a numerical chemical flood model of the North-Two-West pilot area,Daqing Saertu oil field.Alkaline concentration and surfactant concentration in main slug can obviously affect oil recovery,and each of them has an optimal value relating to maximum recovery.Increasing polymer concentration for either alkali-surfactant-polymer main slug or auxiliary slug will significantly improve the incremental oil recovery.Change of sizes of all four slugs will result in change of recovery to a certain extent.