【摘要】 作为一种新型深部调剖剂,凝胶微球与泡沫复合体系(多相泡沫体系)结合了凝胶微球深部调剖和泡沫封堵能力强的特点。从凝胶微球与泡沫的复配性入手,研究了凝胶微球和泡沫的注入特征,并对比了泡沫、凝胶微球和多相泡沫体系对非均质岩心的提高采收率情况。通过实验发现,在空气中,凝胶微球质量浓度为5g/L时,多相泡沫体系的稳定性最好;多相泡沫体系注入过程中压差呈"阶梯式"上升趋势,凝胶微球除了吸附在岩石孔隙表面,还可以在较小孔喉处通过架桥作用形成封堵。多相泡沫体系注入过程中产生了较强的压力波动,有利于采收率的提高。多相泡沫体系提高采收率效果要好于单独使用泡沫或凝胶微球,经过多相泡沫体系调剖后,低渗透岩心最终采收率要高于高渗透岩心最终采收率。更多还原

【Abstract】 Multi-phase foam system (MFS) ,a new in-depth profile control agent,integrates the merits of microgel system and foam system.This paper studies the compatibility of microgel with foam,injection behaviors of foam and microgel,EOR situations of foam system,microgel system and MFS.According to the experiments: the MFS obtains the best stability in air when the concentration of microgel is 5 000 mg/L;The injection pressure of MFS exhibits a "step" ascending trend,besides absorbing on the rock pore surface,the microgels can block the formations through forming bridges in pore throats.Large pressure fluctuation which is fa-vorable for enhancing the oil recovery occurs in the injection process of MFS.The oil recovery of MFS is higher than that of foam system and microgel system,and after MFS flooding,the ultimate oil recovery of low permeability core is higher than that of high permeability core.更多还原