CO2 corrosion is one of the most common problems faced during oil and gas production, although steel pipes offer a long-term economical use in CO2 corrosive environments with the application of carefully selected corrosion inhibitors. Inhibitor efficiency is affected by many variables, including temperature, pressure, flow velocity, pH, and composition of produced water. The impact of brine composition on corrosion inhibitor performance is elucidated in this work; more specifically, the question of whether high salinity or high Ca2+ concentration has a greater impact on corrosion inhibitor performance is answered. Corrosion inhibition performance of various inhibitors, including quaternary amines and alkyl pyridine quat, were evaluated with brines of varying Ca2+ concentration (0 to 20,000 mg/L) and salinity [57,000 to 250,000 total dissolve solids (TDS)]. The corrosion inhibition was studied in situ by linear polarization resistance (LPR), using a UNS G10180(1) (carbon steel). The goal of this study is to help improve corrosion inhibitor design for high calcium containing brines.

Subject
Test methods, Ions, Inhibitor performance, Corrosion rate, Solubility, Calcium, Precorrosion, General corrosion rate, Ion concentrations, Inhibition efficiency, Corrosion inhibitors, Brines, Linear polarization resistance
Keywords:
CO2 corrosion, corrosion inhibitors, quat, ECBQ, pyridine, APQ, calcium ion, TDS
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2021
Association for Materials Protection and Performance (AMPP)
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