大孔道油藏流体流动模式实验

EXPERIMENTAL RESEARCHES ON THE FLOW PATTERNS IN LARGE-CHANNEL OIL RESERVOIR

采用物理模拟的方法验证了大孔道油藏流体的流动模式。通过回归分析，用达西定律和Forehheimer修正的非达西流动定律来逼近实验数据，分析得到大孔道内流体流动存在不同的模式，并用传统方法和油田现场生产数据进行了验证。结果表明，大孔道内流体流动存在一个临界流速，高于临界流速后流动变为高速非达西流，此后惯性力对流动模式影响较大。在油田现场正常的生产压差下，大孔道内流动为高速非达西流。该判断方法主要考虑了渗流速度对流动的影响，兼顾了多孔介质的孔隙结构对流动的影响，是多孔介质中流动模式判别方法的很好补充。

By using physical modeling method, the flow patterns in large-channel oil reservoir are verified. By means of regression analysis, the experimental data are approximated with the helps of Darcy Law and Forchheimer Law. According to the analysis, there are different flow patterns of the liquids in the large-channel and furthermore the results achieved above have been clarified by the traditional methods and actual oilfield production data. The re- sults show that there is a critical flow velocity in the channels; when a velocity is higher than the above value, it will be high-speed Non-Darcy flow, after that the inertial force will excute more serious influence on the flow pat- terns. Under the normal producing pressure differential of the field, the flow in the channel belongs to high-speed Non-Darcy flow. The method is a much better supplementary method to judge the flow patterns in the media for mainly considering the influences of the filtrational velocity on the flows and integrating with the impacts of the pore structures of porous media upon the flows.