水／气交替驱微观实验研究

本文应用微观透明模型直观地观察水、气和水／气交替驱油过程中诸相流体的渗流机理及残余油水分布状况，详细地描述了三相流体在多孔介质中的流动状态，应用图象处理技术监视实验过程并定量分析驱油效率和残余油量。实验结果表明：对水和气而言，任何单一介质的驱替均不能产生驱油的最佳效果，交替驱弥补了单相驱的不足，有利于提高残余油的流动度，交替次数越多，驱油效率越高。夹砂模型实验表明，交替驱过程中存在重力作用。

Micro experiment research onthe alternative displacement of water and gas.

he fluid percolation mechanism and the distribution of residual oil during the alenative dis-placement of water and/or gas were observed directly from transparent microscopic model.The three phase flow of oil,gas,and water in porous medium was described in detail in thispaper. The experiment process was observed by means of image processing technique,and thedisplacement efficiency and residual oil were analyzed quantitatively. The experiment resultsshow that optimum displacement results cannot be obtained by displacement of single medi-um,and that alternative displacement can make up for the weakness of single phase displace-ment and is favorable for improving the mobility of the residual oil.The displacement effi-ciency will become higher with more alternative times. Experiment with sand model indicatesthat gravity exists during alternative displacement.