Application of Cathodic Protection for External Surfaces of Steel Well Casings

This paper introduces the research and application of cathodic protection technology for external surfaces of steel well casings,compares the characteristics and different application conditions of the impressed current method and sacrifcial anode method,and summarizes the evaluating effectiveness methods of cathodic protection.The CP technology plays an effective inhibitory effect to well casings corrosion,extends the service life of oil well casing greatly.