51313-02575-Understanding Factors Affecting Corrosion Inhibitor Performance in Underdeposit Testing with Sand

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Product Number: 51313-02575-SG

ISBN: 02575 2013 CP

Author: Yingrui Zhang

Publication Date: 2013

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This paper addresses the increased understanding of under deposit corrosion and the development of better inhibitors in the presence of sand in sweet (CO2) conditions. In our tests an electrode which was exposed to the bulk solution and an electrode under the sand were galvanically coupled. This method represents the under deposit corrosion condition within oil and gas pipelines mimicking how the pipe surface can be covered by solids such as sand. The corrosion rates of both electrodes were monitored simultaneously using the linear polarization resistance (LPR). Zero resistance ammetry (ZRA) was used to measure the coupling current between the electrode under sand and the one in the bulk brine. After injection of inhibitors the under deposit electrode acted as the local anode and dramatic accelerations of its corrosion have been observed. The LPR corrosion rate the potential of the coupled electrodes and the galvanic current before and after the injection of inhibitors were used to characterize the corrosion inhibitor performance. Factors that affect the under deposit corrosion measurement such as temperature pH of the brine and the thickness of the sand were investigated and utilized in order to develop higher performing corrosion inhibitors for this environment.