考虑组分呈梯度分布的挥发性油藏注气驱数值模拟研究

运用CMG中GEM组分模块对挥发性油藏注气驱进行数值模拟研究。首先基于低渗透正韵律地质模型,分别模拟了油藏流体为等组分和考虑组分梯度分布在不同层位注气/生产点的动态特征,用饱和度分布及油气界面张力2项指标展示了不同层位注气/生产时储层中流体物性的变化规律,结果表明对于特殊类型油藏采用数值模拟优选注气驱完井层位时应当充分考虑组分的梯度分布。然后采用正交试验设计方法对挥发性油藏注气驱影响因素进行敏感性分析,给出了挥发性油藏在不同类型储层中的最佳注气方式。表明挥发性油藏注气驱方法研究时应充分考虑油藏流体呈组分梯度分布,据此可以有效地指导该类油藏的注气方法及应用。

Numerical Simulation on Gas Displacement In Volatile Oil Reservoirs Considering Compositional Gradient Distribution

Numerical simulation of miscible methods by injecting gas was studied by using GEM component module in CMG software.First the production characteristics were studied in different layers of low permeable positive rhythm geologic model considering isothermal model and compositional gradient distribution respectively.The fluid properties were sufficiently displayed by saturation distribution and gas/oil interfacial tensions.The results show that the compositional gradient is considered by using simulation technology for optimizing injection layer in particular reservoirs.Then sensitivity of injection factors in volatile reservoirs are analyzed by orthogonal experimental design.The optimized injection method is given in different types of formations.The result shows that the injection method and application in volatile oil reservoirs are able to be effectively directed by the simulation method.