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Title: Cathodic Protection Of Gas Storage Well Casings
Author: A. W. Hamlin
Source: American Gas Association 1991
Year Published: 1991
Abstract: Consumers Power Company and its subsidiary, Michigan Gas Storage Company, have underground natural gas storage facilities in four geographically separate areas of Michigans Lower Peninsula. Storage fields are in depleted production areas with additional wells drilled to provide optimum field efficiency. We presently have 857 facility wells and 165 observation wells in the system. Underground piping includes approximately 340 miles of well casings and 300 miles of gathering system piping. Cathodic protection was applied to the gathering system lines prior to 1965. In 1967, a survey was initiated to determine: 1. If conditions conducive to external casing corrosion existed in our storage fields. 2. If appreciable corrosion damage had already occurred. 3. The most reliable and economical method of determining cathodic protection current requirements and providing for optimum distribution of current if protection was found necessary. Galvanic conditions conducive to corrosion of storage well casings in our fields were found to include variations in soil composition and resistivity with depth differential aeration cells, caused by limited access of oxygen downhole original drilling conditions such as use of salt saturated drilling mud and cement and the presence of 300-ft to 400-ft layers of very low resistivity salt and salt water.

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