利用微观模型研究乳状液驱油机理

利用真实砂岩微观模型研究和分析乳状液在多孔介质中的驱油机理及其特性,结果表明,经过乳状液驱替后,水驱油形成的各类残余油均有减少.乳状液的驱油机理主要有两种：①利用乳状液堵塞大孔喉带产生的分流作用,减少绕流形成残余油的数量;②借助乳状液进入孔隙喉道中产生的挤压、拉、拽作用,有效驱赶分布在边缘及角隅部位的残余油.实验结果表明,经过乳状液驱替后,驱油效率可提高6%左右.图3表1参13

Experimental study on the mechanism of emulsion flooding with micromodels

By the experiment of emulsion flow in micromodels of real sandstone,the mechanisms of emulsion displacement and its characteristics in porous media were analyzed.The results show that the different kinds of residual oil,which are formed by water flooding,are reduced after the emulsion flooding.There are two manners for the mechanism of emulsion flooding:(1)By the diffluencing effects produced by plugging big channels,the residual oil caused by bypassing flow is reduced;(2)By the actions of extrusion,pull and draught during emulsion flowing into the throats,efficient displacement of residual oil on the edge and corner of the pores is obtained.The experiments show that the oil displacement efficiency will increase by about 6% after emulsion flooding.