非均质性油藏剩余油产生机理实验研究

Experimental Study on Generating Mechanism of the Remaining Oil of the Heterogeneity Reservoir

为深入掌握非均质性油藏剩余油的产生机理,设计填砂管并联水驱油室内物理模拟实验开展研究。结果表明,油藏的非均质性导致高渗带的渗流阻力远低于低渗带的渗流阻力,使得大部分注入水直接进入渗流阻力更小的高渗带,使得高渗带的驱油效率较高,而低渗带赋存大量剩余油;随着水驱的进行,高渗带容易形成水流优势通道,波及效率降低,因此封堵水流优势通道,可提高整个油藏的波及效率和采出程度。

In order to further understand the generating mechanism of remaining oil of the heterogeneity reservoir,we have designed a water flooding test in the plane parallel sand- filled pipe. The results show that due to heterogeneity the flow resistance of high permeability zone is far lower than that of low permeability zone in the heterogeneous reservoir,and most of the injected water goes into the high permeability zone spontaneously,which makes the water- oil displacement efficiency in the high permeability zone higher,and the low permeability zone retaining a larger number of remaining oil. And with water driving,high permeability zone is easy to form the dominant water channels,then sweep efficiency decreases. Therefore,blocking the dominant flow channel is very important to improve the sweep efficiency and oil recovery of the reservoir.