稠油溶解气驱渗流特征物理模拟和数值模拟

为了改善稠油冷采开发效果，通过物理模拟实验和数值模拟方法研究了稠油溶解气驱渗流特征。首先测定了稠油和气体在不同压力下的界面张力，然后通过微观可视化实验和填砂管驱油实验研究了溶解气驱不同阶段渗流特征，最后对室内实验结果进行了数值模拟。研究结果表明：溶解气驱过程中气体逐渐由分散相聚并形成连续相；泡沫油会增大流体的弹性能量，有利于维持溶解气驱地层压力和增大生产压差，从而改善稠油溶解气驱开发效果。在室内实验的基础上，通过3种气体组分（溶解气、分散气和连续气）的转化来描述稠油溶解气驱渗流过程，数值模拟值和物理实验值拟合效果较好。

Physical and numerical simulations of flow characteristics in solution gas drive for heavy oils

To improve the performance of cold production in heavy oil, the flow characteristics of solution gas drive in heavy oil were studied by means of physical experiments and numerical simulations. Firstly, the interfacial tensions between heavy oil and gas under different pressures were measured, and then the flow characteristics of different stages in solution gas drive were appraised through micromodel test and sandpack flooding test. Finally, physical experiment results was numerically simulated and historically matched. The study results indicated that: gas was developed from the dispersed phase to the continuous phase gradually; foamy oil can increase the flow elastic energy, which can maintain the reservoir pressure, increase the production pressure drop and improve the performance of solution gas drive. Base on the physical experiments, three dynamical reaction equations describing the conversion process of different gas components were proposed to simulate the solution gas drive in heavy oil. A better agreement between the physical measured and namerical simulated results could be obtained.