裂缝性储层油水流动规律实验研究

 大部分裂缝性储层具有裂缝-孔隙结构，属于双重介质，目前油水在这类岩石中尤其是裂缝中的流动规律并不十分清楚，这给裂缝性储层油藏的数值模拟、开发方案设计造成较大的困难。为研究裂缝中油水的流动规律，设计了可视的、具有自动数据采集功能的裂缝驱替实验装置，测定了不同裂缝开度下不同液体不同流体黏度以及不同流动速度等条件下裂缝中单相流体的流动状态。结果表明，裂缝中单相液体的流动在一定条件下从线性变成非线性，一般情况下，雷诺数较小时为线性渗流，雷诺数较大时为非线性渗流。但是，雷诺数不是唯一的判别标准。研究还发现，存在两种不同的非线性渗流，在缝宽较小时流量与压力梯度的关系曲线成凹形，较大时则成凸形。

Experimental Study on Oil/Water Flow in Fractures

Most carbonate rocks are dual porosity-permeability porous media with both pores and fractures. Currently the mechanisms of oil and water flow in the rock fractures remain unclear, causing many problems concerning numerical simulation and reservoir engineering in this kind of carbonate reservoirs. In this study, pressures and flow rates were measured in fractures with different apertures using water and oil. For the single-phase oil flow in fractures, refined oils with different viscosity were used. The experimental data showed that the oil or water flow in fractures became nonlinear when the pressure gradient was greater than a specific value. However, it might not be sound enough to use Re as the only parameter and criterion to judge the linearity of fluid flow. The critical Re was different in fractures with different apertures. Two different types of nonlinear flow was found in fractures.