Application of concentric integrated subdivision water injection in offshore field

Water injection wells in western South China Sea are mostly with high angle deviated and medium-deep.Eccentric injection and sliding sleeve commingled water injection cannot meet the needs of injection for the reservoir which has characters of large injection flow rate,big numbers of beds and high temperature.A technique of concentric integrated subdivision water injection suitable for offshore field was developed.It can inject 6 beds separately with ?88.9 mm tube in ?177.8 mm casing.Dynamic monitoring of liquid producing profile could be made with slip range only 2 m long.Injection flow rate of zones which has little water absorption before was enhanced and those have large water absorption were effectively controlled.The reservoir injection goal of sub-layer being injected independently and water being allocated at time was thus achieved.This technique has a wide application foreground for water injection in offshore fields.It can maintain the injection and withdrawal balance as well as the stable production.