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99509 ELECTROCHEMICAL METHODS FOR MONITORING PERFORMANCE OF CORROSION INHIBITOR UNDER MULTIPHASE FLOW

Picture for 99509 ELECTROCHEMICAL METHODS FOR MONITORING
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Product Number: 51300-99509-SG
ISBN: 99509 1999 CP
Author: Y. Chen and M. Gopal
Industries: Chemical Inhibitors , Oil and Gas Production
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This paper presents results of an irnidazoline based (ECN) and Electrochemical Impedance Spectroscopy (EIS) inhibitor using the Electrochemical Noise techniques in a multiphase flow pipeline. ECN and EIS measurements were made simultaneously in a 101.6 mm I.D., 15m long acrylic pipeline using saltwater and carbon dioxide mixtures. Full pipe flow was studied for liquid velocity of 1.25 m/s and slug flow for Froude numbers 6 and 9. Experiments were carried out at a constant pressure of 136kPa and temperature of 40°C. The ECN signals and EIS spectra of blank and inhibition tests were obtained. The ECN technique is able to monitor the inhibitor film formation continuously. The current noise fluctuation is correlated to the corrosion rate for both blank test and inhibitor test. The higher current fluctuation indicates higher corrosion rates. Different EIS spectra were obtained for blank and inhibitor studies. The simple charge transfer process was seen to occur for blank tests while charge transfer and diffusion processes were taking place under inhibitor effects. Keywords: Electrochemical Noise (ECN), Electrochemical impedance spectroscopy (EIS), corrosion inhibitor, multiphase flow
This paper presents results of an irnidazoline based (ECN) and Electrochemical Impedance Spectroscopy (EIS) inhibitor using the Electrochemical Noise techniques in a multiphase flow pipeline. ECN and EIS measurements were made simultaneously in a 101.6 mm I.D., 15m long acrylic pipeline using saltwater and carbon dioxide mixtures. Full pipe flow was studied for liquid velocity of 1.25 m/s and slug flow for Froude numbers 6 and 9. Experiments were carried out at a constant pressure of 136kPa and temperature of 40°C. The ECN signals and EIS spectra of blank and inhibition tests were obtained. The ECN technique is able to monitor the inhibitor film formation continuously. The current noise fluctuation is correlated to the corrosion rate for both blank test and inhibitor test. The higher current fluctuation indicates higher corrosion rates. Different EIS spectra were obtained for blank and inhibitor studies. The simple charge transfer process was seen to occur for blank tests while charge transfer and diffusion processes were taking place under inhibitor effects. Keywords: Electrochemical Noise (ECN), Electrochemical impedance spectroscopy (EIS), corrosion inhibitor, multiphase flow
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ISBN: 99484 1999 CP
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99495 NEW LOW TOXICITY, MULTI-METAL ACTIVE VAPOR PHASE CORROSION INHIBITORS

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02276 WHY CORROSION INHIBITORS DO NOT PERFORM WELL IN SOME MULTIPHASE CONDITIONS: A MECHANISTIC STUDY

Product Number: 51300-02276-SG
ISBN: 02276 2002 CP
Author: Hongbin Wang, Hongwei Wang, Hua Shi, Cheolho Kang, and Paul W. Jepson
Publication Date: 2002
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Results of inhibitor performance at slug flow in a 101.6 mm inner diameter horizontal pipeline. Electrochemical Impedance Spectroscopy (EIS) and scanning electrom microscope (SEM) techniques are used to reveal that the strong bubble impact, high shear stress and turbulent intensity are the reasons for a poor performance of inhibitor.
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