Abstract: The injection wells with sand control completion are characterized by multi-layer separation (two to six layers),high borehole deviation (30 to 60°) and high injection distribution volume for single layer (300 to 700 m³/d).In this paper,the development history of separated water injection technologies has been summarized for Bohai Offshore Oilfield since 1990s.In addition,the application of separated water injection technology,such as one trip for three layers technology,multi-pipe injection technology and hollow integrated zonal injection technology,etc.are also introduced in this paper,and the problems are discussed.Finally,according to the requirements for water flooding in Bohai oilfield,some new water injection technology are discussed,such as zonal injection technology for super high deviation or horizontal wells,downhole pressure boosting technology and subdivisional water injection technology,etc.