Corrosion Analysis of Source Water Treatment System in Lv-da Offshore Oilfield

Lv-da(LD) offshore oilfield in Bohai bay has three drilling and production platforms which are LD10-1,LD5-2 and LD4-2.Severe localized corrosion occurred in source water system of LD5-2 and LD10-1 platforms;and no corrosion appeared in the system of LD4-2.From comparison and analysis of the water quality,flow rate,corrosion status,corrosive factor and corrosion product and so on,it is deduced that the reason of corrosion failure in LD offshore oilfield is FILC (flow induced localized corrosion) caused by high flow rate and accidented welding line in internal surface of pipeline.Some solution approaches against FILC are recommended.