Cathodic Protection of Casings in Loudon Pool

Abstract

Summary This investigation was conducted in an effort to determine whether or not appreciable corrosion was occuring on insulated casings and, if so, whether cathodic protection could be used to prevent external casing corrosion; and to determine the most economical and feasible method for applying this protection. Results indicate that casings which are approximately 1500 feet long can be protected by a current of from 1.0 to 1.5 amperes, and that the anode should be located approximately 200 feet or more from the well. On Devonian wells, which are cased to approximately 3000 feet, the protection appears to extend to about 2000 feet. These conclusions are based on short-time applications of protective current to wells in the Loudon Pool. Further long-time studies of the effect of the protective current are desirable. It is believed that the results are applicable to other similar fields.