起泡剂在不同驱油方式下的驱油效果

对起泡剂XHY-4(阴离子表面活性剂)开展了空气泡沫驱和表面活性剂驱两种驱油方法的效果研究。单管岩心驱替实验结果表明，两种驱油方式下，采收率增幅均随起泡剂浓度的增加而增大并逐渐稳定；起泡剂质量分数相同时，空气泡沫驱采收率增幅高于表面活性剂驱；在XHY-4加量为0.1%时，泡沫驱增幅为8.5%，表面活性剂驱为3.4%。双管并联岩心驱替实验结果表明，表面活性剂驱综合采收率增幅为5.47%，高渗管为7.6%，低渗管为3.3%，含水率由99.55%降至94.95%；泡沫驱综合采收率提高16.5%，高渗管为13.82%，低渗管为19.53%，含水率由98.08%降至70.97%。表面活性剂驱以提高洗油效率为主，而空气泡沫驱以提高低渗管波及体积来提高采收率，低渗管累计增液量为0.14 PV。

Effect of Foaming Agent under Different Displacement Method

The effect of two methods of oil displacement, air foam flooding and surfactant flooding by using XHY-4 foaming agent (anionic surfactant) was studied. Single tube core displacement experiment results showed that the enhanced oil recovery rate increased with increasing concentration of foaming agent and gradually stabilized in two kinds of oil displacement mode. The enhanced oil recovery rate of air foam flooding was higher than that of surfactant flooding under the same foaming agent concentration. When the concentration of foaming agent was 0.1%, the enhanced oil recovery rate of foam flooding was 8.5%, and that of surfactant flooding was 3.4%. Two parallel tubes core displacement experiment results showed that comprehensive recovery rate of surfactant flooding was 5.47%, the enhanced oil recovery rate of high and low permeability tube was 7.6% and 3.3%, and the water cut decreased from 99.55% to 94.95%. The comprehensive recovery rate of foam flooding was 16.5%, the enhanced oil recovery rate of high and low permeability tube was 13.82% and 19.53%, and the water cut decreased from 98.08% to 70.97%. The surfactant flooding improved oil recovery by increasing efficiency of wash oil, while air foam flooding improved recovery factor by improving swept volume. In the process of foam flooding, the cumulative fluid of low permeability tube increased by 0.14 PV.