基于一维流动的低张力泡沫驱数值模拟关键参数研究

Key Parameters of the Numerical Simulation of Low Tension Foam Flooding Based on One-Dimensional Flow Experiments

低张力泡沫具有优于普通泡沫的高强度调剖能力和低张力洗油功能以及很强的耐温抗盐能力,本文针对其特性,基于泡沫驱阻力因子模型,设计岩心流动实验研究了起泡剂浓度、气体注入速度和含油饱和度等因素对低张力泡沫驱效果的影响规律,并在实验结果的基础上,结合参数敏感性分析结果,利用最小二乘法对es、ev和eo等影响低张力泡沫驱数值模拟的实验参数进行了求解,并通过与低张力泡沫驱油实验拟合,验证了模型参数取值的准确性,相应的es、ev和eo取值分别为1.37、0.49和1.585,结果表明修正的低张力泡沫驱模型参数可以很好地模拟低张力泡沫驱机理。

Compared with traditional foams,low tension foam has better profile-controlling,oil-washing,and temperature and salinity resisting abilities.Based on its characteristics and the model of foam resistance factor,influencing factors including the concentration of foaming agent solution,gas injection velocity and oil saturation were studied through core-flow experiments.In combination with the experiments and sensitivity analysis,parameters influencing numerical simulation of low tension foam flooding such as es,ev and eo were calculated with LSM method.Moreover,the accuracy of the model parameters was verified through oil displacement experiment with low tension foam.The results showed that the modified model could exactly simulate the displacement mechanism of low tension foam flooding,and the values of the parameters es,ev and eo were 1.37,0.49 and 1.585,respectively.