【摘要】 通过开展岩心驱替实验，对超低渗油藏氮气泡沫驱合理气液比和段塞尺寸进行了优选研究，以确定合理交替周期。结果表明，气液比1∶5和5∶1时提采幅度最高，在现场应用中，根据流体资源情况，可以选择注入较长的水段塞、较短的注气段塞或者较长的注气段塞、较短的注液段塞；优选了最佳段塞尺寸为0.2 PV，即井间注入量达到1PV时的合理交替周期数为5个。更多还原

【Abstract】 In this paper,through core displacement experiments,optimization research is carried out on the reasonable gas-liquid ratio and slug size of nitrogen foam flooding in ultra-low permeability reservoir,so as to determine the reasonable alternate cycle. The results show that the extraction amplitude is the highest when the gasliquid ratio is 1:5 and 5:1. In field application,according to the situation of fluid resources,you can choose to inject a long water slug or a short gas injection slug or a long gas injection slug or a short liquid injection slug. The optimal slug size is 0.2PV,that is,the reasonable number of alternate cycles is 5 when the injection volume between Wells reaches 1PV.更多还原