05368 APPLICATION OF ELECTROCHEMICAL （05368年应用电化学）.pdf

APPLICATION OF ELECTROCHEMICAL NOISE TECHNIQUE IN MULTIPHASE FLOW Hongbin Wang Institute for Corrosion and Multiphase Technology, Ohio University 342 West State Street Athens, OH 45701 ABSTRACT This paper presents the experimental results for CO corrosion of carbon steel in a 101.6 mm ID 2 multiphase flow loop using electrochemical noise measurement. ZRA mode electrochemical noise technique with three nominally identical electrodes was utilized to study the corrosion processes and inhibitor performance in the stationary slug flow. Comparable corrosion rates were obtained from EN, EIS, and ER tests, suggesting EN technique with a “noisy” RE a practical measurement for investigating CO corrosion in multiphase slug flow condition. Results from EN signals showed that addition of 100 2 ppm inhibitor could retard the corrosion process to a satisfied level for stationary slug flow pattern at Fr 6 in the flow loop tests. Keywords: ZRA mode, multiphase, flow loop, slug flow, electrochemical noise (EN), noisy RE INTRODUCTION In oil and gas industry, various flow regimes in multiphase flow pipeline have encountered, depending upon the pipeline diameter, the composition of the phases and their velocities. High gas and liquid velocity in transportation pipelines would result in slug flow [1, 2] with associated high turbulence and bubble impact mechanism in the mixing zone. Slug flow can be characterized by the Froude Number (Fr), whi