With the increasing oil demand in China

it is very important to further tap the potential of oil and gas fields. Chemical flooding technology is one of the important technologies of EOR

and polymer flooding

as the most important method of EOR

has been widely used in the field and achieved good oil displacement effects. Therefore

by summarizing the basic principles of polymer flooding

the development status of various kinds of polymer for oil displacement and the field application effect of polymer flooding

the development direction of polymer flooding in harsh reservoir conditions

such as high temperature and high salt

has been prospected. Through the review

although functional polymers

such as temperature resistant and salt resistant copolymers

instant polymers and amphiphilic polymers

have been successfully developed

the types of polymers used in the field are still limited. How to apply the research and development achievements of new polymers to on-site EOR is the key development direction. With the development of different polymer types

further research on polymer flooding mechanism is needed.