CORROSION OF THE BURIED PIPELINE IN DAQING TOUTAI OIL FIELD

The testing of some parameters,such as pipeline potential,soil resistivity,resistivity of the anticorrosion and insulation layer,and thickness of the ring pipelines connecting the No.2-5 valve groups to No.5785 and No.5786 oil wells in No.1 oil production area of Daqing Oil Field,indicated that the damage of the surface anticorrosion and heat insulating layer resulted in the water entering to the polyurethane heat insulating layer and caused the local electrochemical corrosion in pipelines.A protection methods of local repair plus cathodic protection was proposed.