This paper describes a methodology for the investigation of corrosion of galvanized armor wires used in the construction of wireline logging cables. The methodology involves a detailed characterization of the wires to determine the characteristics of the zinc coating and Zn/Fe alloy zones. Model brine solutions and fully formulated drilling fluids were used to quantify the corrosion of galvanized armor wires in the aqueous fluid system (AFS) using weight-loss analysis and electrochemical techniques. A novel corrosion test protocol was developed to accurately measure both zinc dissolution and surface oxidation of the zinc coating. The degradation of the zinc coating was determined as a function of brine composition, oxygen concentration, pH, and temperature. The effectiveness of a grease coating applied to the wire sample surfaces prior to exposure to the brine was evaluated.

Subject
Zinc rich coatings, Corrosion rate, Metal surfaces, Dissolution, Wiring, Acidity, Cables, Oxide surfaces, Zinc oxide, Film formation, Brines, Potassium chloride, Zinc
Keywords:
galvanized armor wire, wireline logging cable, corrosion
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2024
Association for Materials Protection and Performance (AMPP)
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