Abstract
Top of the line corrosion (TLC) is one of the main root causes for many multiphase pipeline failures in the upstream oil and gas industry. The most challenging issue for assessment of TLC in multiphase pipelines is simulating the operational conditions to find out the governing mechanisms of corrosion and its inhibition. The current work aimed to develop a novel setup for evaluating the TLC and its inhibition using the in-situ electrochemical techniques under simulated conditions. Moreover, since one of the major influencing factors in TLC is the pressure of acid gases (CO2 and H2S), an autoclave was designed to provide the feasibility of in-situ electrochemical experiments under pressurized conditions. Specialized probes were developed and placed at both the top and bottom of the autoclave to study and compare the corrosion behavior and inhibition performance at both locations. To check the function of the setup, different experiments, including electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization scanning (PDS), and linear polarization resistance (LPR) were conducted in different conditions. The performance of the system was validated by comparing the electrochemical results with weight loss coupons in autoclave and a field study in actual conditions The capability of the setup for evaluating the smart inhibition of TLC was checked with an amine-based volatile corrosion inhibitor and confirmed by EIS.
Published Version
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