二元泡沫流动性能影响因素研究

RESEARCH ON BINARY FOAM FLOODING PROPERTY INFLUENCE FACTORS

通过研究泡沫在多孔介质中的流动性能,考察了发泡剂和聚合物(HPAM)浓度、气液比、渗透率和注入方式等对提高岩芯波及系数、降低渗透率的影响。实验结果表明:泡沫在岩芯中的阻力系数和残余阻力系数均随发泡剂及HPAM的浓度增加而增加,发泡剂、HPAM浓度大于一定值后,泡沫的阻力系数、残余阻力系数增加缓慢;泡沫在不含油岩芯中的阻力系数和残余阻力系数是含油岩芯中的3倍以上;适当增加气液比有利于提高泡沫的流度控制能力,但过大的气液比会出现气窜;同一泡沫体系并不适合改善所有不同渗透率岩芯的流度控制能力,可以通过改变泡沫体系配方来改善泡沫流度控制能力,提前发泡方式注入的泡沫流度控制能力最佳,交替方式注入泡沫的流度控制能力随交替段塞增加而降低。

The foam effect on improving the core sweep efficiency and reducing permeability are investigated by foam flooding in porous media experiments. The influence of α-olefin sulfonate(AOS),hydrolyzed polyacrylamide( HPAM)concentration,gas liquid ratio,core permeability,and injection methods on foam flooding property are explored. The experiment results show that foam flooding resistance coefficient and residual resistance coefficient increase with the increasing concentration of AOS and HPAM. The foam flooding resistance coefficient and residual resistance coefficient in the non-oil rock heart are more than three times of those in the oil-bearing rock. Under the condition that AOS and HPAM concentration are greater than a certain value,foam flooding resistance coefficient and residual resistance coefficient are stabilized. Appropriate increasing ratio of gas-liquid can improve foam flooding control ability,but too much ratio of gas-liquid will cause gas channeling. The same foam system does not improve flooding control ability of all different permeability cores. Advanced foam injection leads to the best mobility control than other ways. The mobility control of the alternating injection of liquid and gas foam decrease with the increase of alternating slug.