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

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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.

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
Industries: Oil and Gas Production , Chemical Inhibitors , Corrosion Monitoring and Control
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This paper presents the results and analysis of inhibitor performance of CO2 corrosion at slug flow in a 101.6 mm inner diameter horizontal pipeline. Electrochemical Impedance Spectroscopy (EIS) and 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 at slug flow of Froude number 12. A metal-film-solution model is presented and its electrochemical characteristics are discussed. The electrochemical analysis is consistent with the hydrodynamic analysis that there are large inhibitor-uncovered areas on the steel surface at higher Froude number.

Key words: electrochemical impedance spectroscopy (EIS), charge transfer resistance, capacitance, mass transfer, bubble impact, turbulence, inhibitor film, corrosion product film

This paper presents the results and analysis of inhibitor performance of CO2 corrosion at slug flow in a 101.6 mm inner diameter horizontal pipeline. Electrochemical Impedance Spectroscopy (EIS) and 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 at slug flow of Froude number 12. A metal-film-solution model is presented and its electrochemical characteristics are discussed. The electrochemical analysis is consistent with the hydrodynamic analysis that there are large inhibitor-uncovered areas on the steel surface at higher Froude number.

Key words: electrochemical impedance spectroscopy (EIS), charge transfer resistance, capacitance, mass transfer, bubble impact, turbulence, inhibitor film, corrosion product film

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Picture for 02274 EFFECTIVENESS OF CORROSION INHIBITORS...
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02274 EFFECTIVENESS OF CORROSION INHIBITORS IN RETARDING PROPAGATION OF LOCALISED CORROSION

Product Number: 51300-02274-SG
ISBN: 02274 2002 CP
Author: A. Turnbull, D. Coleman, A.J. Griffiths, P.E. Francis, and L. Orkney
Publication Date: 2002
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In many service applications excursions in solution chemistry, temporary loss of inhibitor, or transient increases in temperature may give rise to localised corrosion. To test the return of inhibition when the loss is remedied, the use of an artificial pit has been investigated using simulations of cooling water and of of oil production formation water.
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02288 EVALUATION OF INHIBITOR PERFORMANCE FOR PROTECTION AGAINST LOCALIZED CORROSION

Product Number: 51300-02288-SG
ISBN: 02288 2002 CP
Author: J. Marsh, J. W. Palmer and R. C. Newman
Publication Date: 2002
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 A novel evaluation technique, based on an artificial pit electrode, has been developed for inhibitor studies. The first example is of three generic inhibitors, against localised corrosion. The second is of three industrial inhibitors against existing localised corrosion on a north sea production platform
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02405 A CONVENIENT, LOW COST LABORATORY PROTOCOL FOR SCREENING SCALE INHIBITORS

Product Number: 51300-02405-SG
ISBN: 02405 2002 CP
Author: D. P. Wyman, R. D. Moll, J. D. Fox, F. J. Grad, and V. Mihalitsas
Publication Date: 2002
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A convenient protocol for screening the potential efficacy of scale inhibitors is described. All of the techniques used require relatively inexpensive equipment. Two types of scale are addressed in this paper, calcium carbonate and calcium oxalate, but the general procedures are expected to be applicable to inhibitor screening for others as well.
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