耐温型冻胶泡沫调驱体系的性能研究

通过气流法制得了稳定性好、强度高、封堵能力强的耐温型冻胶泡沫体系，考察了体系pH、无机盐、温度、原油等对冻胶泡沫稳定性的影响，评价了冻胶泡沫破坏后水化液的洗油能力；通过与常规氮气泡沫和弱冻胶的对比试验，考察了冻胶泡沫的调驱性能。结果表明，冻胶泡沫体系在phi〉8时，稳定性几乎不受pH影响，在80℃时稳定性最好；冻胶泡沫起泡前加入原油，体系稳定性变化很小，起泡后加入原油，体系稳定性变差；冻胶泡沫水化液使采收率提高；冻胶泡沫调驱后，低渗岩心的采收率提高了47．91％，比弱冻胶和常规氮气泡沫调驱效果好。

Study on Performance of Heat Resistant Jel Foam Profile Control and Oil Displacement System

A heat resistant jel foam system that is stable and of high strength and selective plugging capac- ity was prepared with air flow method, the effect of pH value of the system, inorganic salt, temperature and crude oil, etc. on the stability of the foam was investigated, the oil flushing capacity of the hydration solution after the jel foam is destroyed was evaluated, and the profile control and oil displacement performance of this jel foam was studied by comparing it with conventional nitrogen foam and weak gel through testing. According to the results, the stability of the jel foam system is hardly affected by pH value when pH value is greater than 8 with the stability being best at 80 ~C. The stability of the system changes little when the jel foam is added to crude oil before it foams and becomes poor when the jel foam is added to crude oil after it foams. The recovery efficiency was increased due to the formation of jel foam hydration solution, and the recovery efficiency in low permeability core was increased by 47.91% after the jel foam is added, showing that this jel foam is better than weak gel and conventional nitrogen foam in Profile. control and nil rli,,nl~,.,~,-,,~nt