利用填砂方法制作了均质多孔介质模型,进行了CO2泡沫液驱替模拟实验,借助CT技术研究了多孔介质内CO2泡沫液渗流特性。在不同填砂粒径、不同活化剂浓度及不同气液比条件下进行多孔介质内CO2泡沫液驱替实验,采用CT技术对驱替过程进行可视化监测,获取沿程水饱和度数据,并同时测量泡沫液渗流过程中的沿程压力。实验结果表明：CO2泡沫液在平均粒径较小的多孔介质内具有较大的渗流压差及较小的水饱和度入口效应;当活化剂浓度高于临界胶束浓度时,产生的泡沫较稳定,介质内沿程各位置处泡沫液驱替效率相差不大,且随着活化剂浓度的提高水饱和度入口效应逐渐减小;提高气液比可以增大泡沫液渗流压差,但对驱替后介质内水饱和度的影响不大。图8参25
杜东兴
,
王德玺
,
贾宁洪
,
吕伟峰
,
秦积舜
,
王程程
,
孙盛彬
,
李莺歌
. 多孔介质内CO2泡沫液渗流特性实验研究[J]. 石油勘探与开发, 2016
, 43(3)
: 456
-461
.
DOI: 10.11698/PED.2016.03.17
Simulative experiments were carried out for CO2 foam flooding process in homogeneous porous media prepared with the sand packing method, and the CO2 foam seepage characteristics in porous media were studied with CT technology. CO2 foam flooding experiments were carried out under different packing sand sizes, different surfactant concentrations and different gas-liquid ratios. CT technology was employed to visualize the displacement process and to obtain the water saturation data along the sample, and the pressure distribution in the sample during the foam seepage process was measured at the same time. Experimental results show that, CO2 foam flooding has higher pressure drop and lower water saturation entrance effect in the porous media with lower average grain sizes; when surfactant concentrations are higher than CMC (Critical Micelle Concentration), the generated foam is stable, without showing obvious difference for the foam displacement efficiency in the sample, and water saturation entrance effect gradually decreases with increase of surfactant concentrations; improving gas-liquid ratio can lead to higher foam seepage pressure drop, but has little effect on residue water saturation after foam displacement.
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