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Cathodic Protection (CP) System at Gas Wells Maintenance and Troubleshooting

Picture for Cathodic Protection (CP) System at Gas Wells Maintenance and Troubleshooting
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A cathodic protection (CP) system reduces corrosion by minimizing the difference in potential between the anode and the cathode. This reduction can be achieved by applying a current to the structure to be protected from an electrical source. When enough current is applied, the whole structure will be at one potential, thus anode and cathode sites will not exist. CP is commonly used on many types of structures, such as pipelines and underground storage tanks.
The paper is about an effort to improve Southern Area Gas Producing Facilities’ (SAGPF’s) CP system in compliance with all related Saudi Aramco standards, procedures, and GIs, and provides in depth analysis and recommendations to mitigate CP system challenges, and to make CP system reliable. In addition, the study aims to identify key tasks to minimize the effect of component failures and to increase the reliability of SAGPF remote monitoring units, to get accurate data. The onsite CP system survey was performed from April 26 to September 30, 2018, for all SAGPF. This paper is focused on the major challenges, such as equipment failures, operational deficiencies, and technical recommendations to make the CP system efficient and reliable.

Product Number: MPWT19-14286
Author: Mohammed M Alsaaq
Publication Date: 2019
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Picture for CP upgrade options for aboveground storage tanks
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CP upgrade options for aboveground storage tanks

Product Number: MPWT19-14297
Author: Mohammed Alotaibi
Publication Date: 2019
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Storage tanks are the primary means for storing large volumes of liquids and gaseous products. Metal
loss from internal and external corrosion can reduce the service life of a tank. It is important to maintain
the integrity of steel storage tanks for safety, economic, and environmental reasons.
Saudi Aramco implemented three different scenarios of cathodic protection (CP) during bottom plate
replacement for three typical tanks. The tanks’ bottom plates were replaced based on thickness
measurements and visual inspection that revealed severe corrosion from soil. The main reason for
such corrosion was due to the asphalt layer underneath the tank. It was considered during the
replacement of the bottom plate to provide a reliable external (CP) and leak detection system. The
purpose of this paper is to demonstrate the experience gained from executing CP upgrades, and to
provide the best option to ensure integrity, cost saving and fewer shutdown periods.
Picture for Interference between sacrificial CP systems
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51316-7797-Interference between sacrificial CP systems

Product Number: 51316-7797-SG
ISBN: 7797 2016 CP
Author: Tim Froome
Publication Date: 2016
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Picture for Well Casing CP - Design Issues & Case History
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51318-10655-Well Casing CP - Design Issues & Case History

Product Number: 51318-10655-SG
Author: Jeffrey L. Didas
Publication Date: 2018
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Design issues with well casing Cathodic Protection - CP. Need for and benefits of CP discussed. Case history dealing with design issues and what solutions were available and utilized.
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