Cathodic Protection of Outdoor Removable Deep Well Anodic Casing

For outer corrosion of casing of single or double well cluster in loess plateau area,the CP technology of outdoor removable deep well anodic in Changqing Oilfield was tested.When the CP system operating voltage of the composite anode of MMO and silicon cast iron was less than 16 V and the anodic well depth was more than 200 m,the depth of casings protected was more than 1 400 m and the MMO anode was removable.This technology offers an economic and suitable way to protect the casings of complete single or double well clusters in the oilfield similar to that in loess plateau area.