Situation of Corrosion and Anticorrosion Technology of Oil Tanks in Changqing Oilfield

With the service life extension of oil tanks in Changqing oilfield,normal production is seriously affected by the bottom and coil corrosion perforation.The interior corrosion of tanks is mainly caused by dissolved oxygen,chloride,sulfate reducing bacteria and scale.According to the corrosion factors and existing problems of anticorrosion technology,relevant coatings and sacrificial anodes were researched.The mechanical properties,impact toughness and heat resistance of the developed coatings were much better than that of conventional epoxy,indicating excellent comprehensive anti-corrosion properties.The anode materials are suitable for high temperature corrosion environment.Combined protection technology has been successfully used in the tanks,the field application proves that the technology can prolonge the service life of tanks more than 1 time.