ENHANCED OIL RECOVERY THROUGH NITROGEN INJECTION IN YANLING OIL FIELD

As one of the extensively used EOR methods, gas drive has a better oil displacement effect. Especially nitrogen injection, because it is apt to acquire, non-corrosive,and is suitable to most of the reservoir geologic structure and the physical property of crude oil, it is used most extensively, and represents the development direction of EOR at present. This paper took Yanling oil field as an example, briefly introduce the EOR mechanism of nitrogen injection, construction of nitrogen injection units, nitrogen generating technological process, completion mode and method after nitrogen injection and so on.