The injection is done in several stages with each chemical or water injected during that stage called a slug.
注入过程分几个阶段进行，在每阶段注入的一种化学剂或水都称为段塞。
2
Displacing oil and water by gas is very effective, showing gas storage construction in late high water cut stage will have good gas injection and preservation capability.
天然气驱油和水的效果十分明显，说明高含水后期油藏进行储气库建设，其注气、储气能力较好。
3
The nitrogen injection pilot in Yanling oil field is for EOR of carbonate reservoir with bottom aquifer in high water cut stage under the cooperation with TOTAL French oil Company.