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02288 EVALUATION OF INHIBITOR PERFORMANCE FOR PROTECTION AGAINST LOCALIZED CORROSION

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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

Product Number: 51300-02288-SG
ISBN: 02288 2002 CP
Author: J. Marsh, J. W. Palmer and R. C. Newman
Publication Date: 2002
Industries: Chemical Inhibitors , Maritime
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Corrosion inhibitor tests typically evaluate performance with respect to general corrosion. However, pipeline failures in oil and gas production are predominantly caused by localised corrosion, not general corrosion. A novel evaluation technique, based on an artificial pit electrode, has been developed for inhibitor studies. Two examples of its application are presented. The first is a determination of the relative effectiveness of three generic inhibitors, a quaternary amine, a phosphate ester and oleic imidazoline, against localised corrosion in a slightly sour environment. The second is an assessment, using similar techniques, of three industrial inhibitors for use against existing localised corrosion on a north sea production platform subject to barium sulphate scaling of the topside pipework. In both cases the tests were able to discriminate between inhibitors which gave similar levels of protection against general corrosion. It was also found that prevention/mitigation of existing localised corrosion required far higher inhibitor concentrations than general corrosion, and inhibitor efficiency could not easily be increased beyond 75%.

Keywords: Corrosion inhibitors, offshore oil production, localised corrosion

Corrosion inhibitor tests typically evaluate performance with respect to general corrosion. However, pipeline failures in oil and gas production are predominantly caused by localised corrosion, not general corrosion. A novel evaluation technique, based on an artificial pit electrode, has been developed for inhibitor studies. Two examples of its application are presented. The first is a determination of the relative effectiveness of three generic inhibitors, a quaternary amine, a phosphate ester and oleic imidazoline, against localised corrosion in a slightly sour environment. The second is an assessment, using similar techniques, of three industrial inhibitors for use against existing localised corrosion on a north sea production platform subject to barium sulphate scaling of the topside pipework. In both cases the tests were able to discriminate between inhibitors which gave similar levels of protection against general corrosion. It was also found that prevention/mitigation of existing localised corrosion required far higher inhibitor concentrations than general corrosion, and inhibitor efficiency could not easily be increased beyond 75%.

Keywords: Corrosion inhibitors, offshore oil production, localised corrosion

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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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Guidelines for Corrosion Inhibitor Selection for Oil and Gas Production

Product Number: 51317--8842-SG
ISBN: 8842 2017 CP
Author: Johannes Sonke
Publication Date: 2017
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Recommended corrosion inhibitor (CI) testing methods and interpretation to assure proper execution of a test program. Associated guidance for CI test program definition testing and management to ensure and improve the integrity of carbon steels applications in our Industry.
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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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