Abstract: Nitrogen foam displacement is an alternative technique for heavy oil and can enhance the oil recovery ．Foam agent is
optimally selected from several ones based on foam performance by static and dynamic tests ．Visual experiments are performed
to study the adaptability of formation ， and it is show that oil recovery is lower in heterogeneous formation than that in
homogeneous formation ．However ，under condition of residual oil ，the increment of recovery in heterogeneous formation is
larger than that in homogeneous one ．The more heterogeneous the porous media is ，the higher the increment of oil recovery and
the better the efficiency of foam displacement ．

Key words: Nitrogen foam displacement , Foam agent , Formation adaptability

摘要： 氮气泡沫驱是普通稠油开采后期的一种经济可行的接替技术,可以大幅度提高剩余油采收率。氮气泡沫驱取得效果的一个重要前提是选择发泡性能好,泡沫阻力大的发泡剂。采用静态和动态实验对几种初选的发泡剂进行了优选,选出了性能最优的发泡剂;并进行了可视化实验,对氮气泡沫驱油层适应性进行了研究,表明非均质模型泡沫驱效率均低于均质模型,但在残余油状态下,非均质模型泡沫驱增油效果要明显高于均质模型。储层非均质性越严重,水驱残余油状态下,泡沫驱油的增产效果越显著。对于非均质严重的储层,矿场泡沫驱油增产效果更好。

关键词: 氮气泡沫驱, 　发泡剂, 　油层适应性