石油非达西渗流的新模式

NEW PATTERN AND ITS RULES OF OIL NONDARCY FLOWIN POROUS MEDIA

姚约东 葛家理

Yao Yuedong Ge Jiali

石油大学石油天然气工程学院, 北京 102249

Institute of Petroleum and Gas Engineering, University of Petroleum

为认识和了解多孔介质中渗流的基本规律,用无因次分析法对岩心的实验数据进行了分析,得出石油渗流的运动形态有5种:超低速、低速、线性达西、亚高速及高速紊流。并在无因次关系曲线上确定出这5种流态相互转化的临界值。归纳出5种流态的数学统一表达式,对超低速和低速2种新的运动形态从物理和力学角度进行分析,推导出启动压力梯度的表达式。通过对非达西渗流模型进行求解,分析出非达西对地下油气渗流的影响。

Through the application of dimensionless analysis,the data of fluid flow in porous media have been plotted to log-log type curve.In order to understand the rule of fluid flow in porous media.Based on test of much core,the pattern of petroleum flow in porous media have five forms:high speed,sub-high speed,linear,low velocity and super low velocity.And the marginal values of them have been obtained.Summarize,all pattern’s equation can be described as follows:.The physical and mechanical analysis of low velocity and super low velocity patterns has demonstrated the same conclusion with the experiment.And the starting pressure gradient has been demonstrated.Based on the new non-Darcy flow theory,typical examples of transient flow are studied.It is clear that the new non-Darcy model proposed here has significant advantages for study on fluid flow in porous media,and it can guide oilfield development.

10.3969/j.issn.1000-7393.2003.05.011