Elucidating The Influence Of Calcium Ion Concentration On Corrosion Inhibitor Performance

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Product Number: 51321-16692-SG

Author: Michal Ciolkowski; Neil Bretherton

Publication Date: 2021

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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.