关键词: 氮气泡沫驱, 　发泡剂, 　油层适应性

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