This AMPP standard practice identifies procedures to determine the need for cathodic protection (CP) and the current requirements to achieve CP of well casings associated with land-based and offshore oil and gas production and gas storage. The standard is applicable to single or multi-phase production (oil, gas and water), reinjection (for product stor- age, product disposal, or reservoir maintenance) as well as for geothermal wells. It also outlines practices for the design and installation of CP systems and for their operation and maintenance. The purpose of this standard is to ensure more effective prevention of corrosion of well casings by making available reliable information about CP as it relates to well casings. This standard is intended for use by corrosion engineers in oil and gas production, especially those concerned with the CP of steel well casings.

Keywords: Steel wall casings, External surfaces, CP, CP design, and Cathodic protection.