泡沫驱替过程中阻力因子与岩心气相饱和度的变化

Change Characteristic of Resistance Factor and Gas Saturation in Sand Pack during Foam Flooding

李松岩 李兆敏 李宾飞 李金洋

LI Songyan，LI Zhaomin，LI Binfei，LI Jinyang

为了解在不同注入参数下泡沫驱的气相饱和度变化规律、 深入分析泡沫渗流机理， 通过岩心驱替实验， 研究了泡沫驱替过程中注入速度、 气液比、 岩心渗透率和含油饱和度对泡沫阻力因子与岩心气相饱和度的影响， 分析了气相饱和度与封堵能力之间的关联性。结果表明， 泡沫渗流阻力因子随注入速度和渗透率的增大而增大、随气液比的增大而先增大后降低； 气液比为 1∶1～ 2∶1时， 阻力因子为 172～ 194， 泡沫封堵性能最好； 岩心含油饱和度由 0增至 65.21%时， 阻力因子从 172降至 71； 泡沫对渗透率和油水层有良好的选择性； 注入速度和气液比对岩心最高气相饱和度和水驱后气相饱和度的影响较小， 最高气相饱和度均能达到 80%以上， 水驱后气相饱和度均在 60%～75%之间； 随岩心渗透率增大， 最高气相饱和度和水驱后气相饱和度先增大后降低； 随含油饱和度的增加， 气相饱和度降低。气相饱和度与泡沫封堵能力有较好的关联性， 岩心中气相饱和度达到 60%以上时才能形成有效封堵， 阻力因子快速增加。图5表2参17

In order to understand the change of gas saturation during foam flooding under different injection parameters，and analyze the mechanism of foam flow in porous media，the effects of injection rate，gas-liquid ratio，permeability and oil saturation on foam resistance factor and sand pack gas saturation during foam flooding were studied through sand pack displacement experiment. The relationship of gas saturation and the plugging capability of foam was analyzed. The results showed that foam resistance factor increased with increasing injection rate and permeability，and increased firstly and then decreased with increasing gas-liquid ratio. When the gas-liquid ratio ranged from 1∶1 to 2∶1，the resistance factor increased from 172 to 194，and the plugging capability of foam was the best. When the oil saturation increased from 0 to 65.21%，the resistance factor decreased from 172 to 71. Foam had good selectivity to the permeability and oil-water layer. Injection rate and gas-liquid ratio had weak effect on the highest gas saturation and gas saturation after post water flooding. The highest gas saturation could reach more than 80%，and gas saturation after post water flooding could reach 60%—75%. The highest gas saturation and gas saturation after post water flooding increased first and then decreased with increasing permeability. The gas saturation decreased with increasing oil saturation. The relationship between gas saturation and the plugging capability of foam was good. When the gas saturation was higher than 60% in the sand pack，foam could form effective plugging，and resistance factor increased obviously.

10.19346/j.cnki.1000-4092.2016.06.016