低渗透岩心渗流力学实验研究

对于低渗透油气藏,其渗流规律表现出对达西定律的偏离,主要特征表现为在渗流过程中存在启动压力梯度。目前主要用达西定律来近似处理这些问题,这与真实情况存在着较大误差,影响着油气藏的产量和经济效益。因此本文在分析、研究大量低渗岩心实验数据的基础上,证明了启动压力梯度及低速非达西渗流的存在,得到了流体粘度、地层温度对拟启动压力梯度的影响规律,并分析了原油粘度在缝隙中的变化规律,以及渗流过程中阻力系数与雷诺数间的关系;通过以上研究希望能为低渗透油气田高效开发提供了理论依据。

An Experimental Study on Fluid Mechanics in Porous Medium of Tight Rock

For the low-permeability reservoir,the flow characteristics showed deviation from Darcy＇s law,mainly characterized by the starting pressure gradient;Currently,Darcy＇s law is mainly used to approximate address these issues,which is the real situation there is a big errors,affecting oil and gas reservoir production and economic benefits.Therefore,this article analysis to study a large number of low-permeability cores on the basis of experimental data proved that low start-up pressure gradient,and obtained the regular pattern that had been fluid viscosity,formation of temperature on the impact of the law of the starting pressure gradient,analyzed the discipline that viscosity of crude oil changed in the gap,and the flow resistance coefficient and Reynolds number during the inter-relationships;Through the above study that hope to provide low-permeability oil and gas fields to provide a theoretical basis for efficient development.