Results are reported of cathodic protection tests made on three oil well casings at Kettleman Hills, California. The tests showed that cathodic protection is a practical method of controlling external casing corrosion at least to depths of 8,000 feet, provided sufficient current is used. Current densities on the order of 1.0 to 1.5 ma per sq ft are believed necessary to provide essentially complete protection to wells in the area. Both surface potential and casing potential profile measurements were made during the tests. Inexpensive surface measurements of casing potentials referred to a remote reference electrode can be used to indicate with reasonable accuracy the degree of protection obtained with cathodic protection. 5.2.1

You do not currently have access to this content.