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Analysis of different factors affecting cathodic protection for deep well casings / I. A. Metwally in Materials and corrosion, Vol. 61 N° 3 (Mars 2010) 

Public ISBD [article]  in Materials and corrosion > Vol. 61 N° 3 (Mars 2010) . - pp. 245–251 Titre : Analysis of different factors affecting cathodic protection for deep well casings Type de document : texte imprimé Auteurs : I. A. Metwally, Auteur ; A. H. Al-Badi, Auteur Année de publication : 2010 Article en page(s) : pp. 245–251 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : Cathodic  protection;  interference;  oil  well  casing;  pulse  rectifier;  simulation;  stray  current Résumé : This paper introduces a comparative theoretical investigation of the conventional cathodic protection (CP) and the pulse cathodic protection (PCP) systems to show how both of them behave under different operating conditions. The effectiveness of the PCP system is also highlighted for a typical large-scale configuration as well as some field measurements have been carried out. The performance of PCP system has been analyzed in the light of getting better protection-current distribution along the protected well casing at reduced anode current together with reducing the stray current (corrosion) at any nearby unprotected structure(s). Many factors have been investigated to show their effects on the performance of the CP system, namely, soil resistivity, voltage pulse waveform and frequency, and multi-layer soil. In addition, the performance of both the conventional CP and the PCP systems has been compared to that when utilizing unused/abandoned well casing as anode energized by the conventional CP system. The PCP system shows better performance than that of the conventional CP, and a similar performance at high soil resistivity to that when using unused/abandoned well casing. On the other hand, the utilization of the unused/abandoned well casing gives superior performance, especially at low soil resistivities, where the protection-current profiles of both the conventional CP and the PCP systems decay sharply. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905272/abstract [article] Analysis of different factors affecting cathodic protection for deep well casings [texte imprimé] / I. A. Metwally, Auteur ; A. H. Al-Badi, Auteur . - 2010 . - pp. 245–251. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 61 N° 3 (Mars 2010) . - pp. 245–251 Mots-clés : Cathodic  protection;  interference;  oil  well  casing;  pulse  rectifier;  simulation;  stray  current Résumé : This paper introduces a comparative theoretical investigation of the conventional cathodic protection (CP) and the pulse cathodic protection (PCP) systems to show how both of them behave under different operating conditions. The effectiveness of the PCP system is also highlighted for a typical large-scale configuration as well as some field measurements have been carried out. The performance of PCP system has been analyzed in the light of getting better protection-current distribution along the protected well casing at reduced anode current together with reducing the stray current (corrosion) at any nearby unprotected structure(s). Many factors have been investigated to show their effects on the performance of the CP system, namely, soil resistivity, voltage pulse waveform and frequency, and multi-layer soil. In addition, the performance of both the conventional CP and the PCP systems has been compared to that when utilizing unused/abandoned well casing as anode energized by the conventional CP system. The PCP system shows better performance than that of the conventional CP, and a similar performance at high soil resistivity to that when using unused/abandoned well casing. On the other hand, the utilization of the unused/abandoned well casing gives superior performance, especially at low soil resistivities, where the protection-current profiles of both the conventional CP and the PCP systems decay sharply. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.200905272/abstract