二氧化碳泡沫封窜体系筛选与评价

Screening and Evaluation of Carbon Dioxide Foam Plugging System

CO2泡沫控制气窜、改善流度比,是目前较热门的一种封窜方法。当泡沫在孔隙介质中渗流时,其渗流特性非常独特,能改善驱替流体在非均质油层内的流动状况,并有效地降低气体流度。实验采用CO2气体充气法筛选出稳定起泡剂CY-I,并采用Ross-Miless法评价起泡体积为435ml,半衰期244min,用CO2气体充气法评价,半衰期82min,体系表面张力30.3mN/m,界面张力0.41mN/m,表界面张力较低,能在地层中起到一定的驱油作用。实验结果表明:CY-I起泡剂与注入水配伍性好,经泡高仪Ross-Miles法和充气法检测,起泡能力强和半衰期长。

CO2 foam control of gas channeling,improve the mobility ratio,is a popular method.to prevent gas channeling.When the foam percolates in the porous medium,its percolation characteristics are very unique,which can improve the displacement fluid flow in the heterogeneous oil layer and effectively reduce the gas fluidity.In the experiment,CO2 gas inflation method was used to screen the stable bubbling agent CY-1,and Ross-Miless method was used to evaluate the bubbling volume of 435ml,half life 244min,using CO2 gas inflation method to evaluate,half life 82min,system surface tension 30.3mN/m,interfacial tension 0.41mN/m,surface interfacial tension is low,can play a certain role in the formation of oil displacement.The experimental results show that CY-1 foaming agent has good compatibility with injected water,and it has a strong foaming ability and a long half-life after being detected by the ross-miles method of the bubble height meter and aeration method.