Commenced in January 2007
Frequency: Monthly
Edition: International
Paper Count: 31754
Effect of Inhibitors on Weld Corrosion under Sweet Conditions Using Flow Channel

Authors: Khaled Alawadhi, Abdulkareem Aloraier, Suraj Joshi, Jalal Alsarraf

Abstract:

The aim of this paper is to compare the effectiveness and electrochemical behavior of typical oilfield corrosion inhibitors with previous oilfield corrosion inhibitors under the same electrochemical techniques to control preferential weld corrosion of X65 pipeline steel in artificial seawater saturated with carbon dioxide at a pressure of one bar. A secondary aim is to investigate the conditions under which current reversal takes place. A flow channel apparatus was used in the laboratory to simulate the actual condition that occurs in marine pipelines. Different samples from the parent metal, the weld metal and the heat affected zone in the pipeline steel were galvanically coupled. The galvanic currents flowing between the weld regions were recorded using zero-resistance ammeters and tested under static and flowing conditions in both inhibited and uninhibited media. The results show that a current reversal took place when 30ppm of both green oilfield inhibitors were present, resulting in accelerated weld corrosion.

Keywords: Carbon dioxide, carbon steel, current reversal, inhibitor, weld corrosion.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1091936

Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 2717

References:


[1] A. Ikeda, M. Ueda, and S. Mukai, "CO2 behavior of carbon and Cr steels”, in Proc. NACE Corrosion/84, Houston, Texas, 1984.
[2] X. Jiang, Y. G. Zheng, D. R. Qu, and W. Ke , "Effect of calcium ions on pitting corrosion and inhibition performance in CO2 corrosion of N80 steel”, Corrosion Science, vol. 48, pp. 3091-3090, October 2006.
[3] D. A. Lopez, S. N. Simison, and S. R. de Sanchez, "The influence of steel microstructure on CO2 corrosion. EIS studies on the inhibition efficiency of benzimidazole”, Electrochimica Acta, vol. 48, pp. 845-854, February 2003.
[4] M. B. Kermani, and A. Morshed, "Carbon dioxide corrosion in oil and gas production – a compendium”, Corrosion, vol. 59, pp. 659-683, 2003.
[5] F. Farelas, and A. Ramirez, "Carbon Dioxide Corrosion Inhibition of Carbon Steels Through Bis-imidazoline and Imidazoline Compounds Studied by EIS”, Int. J. Electrochem. Sci., vol. 5, pp. 797-814, 2010.
[6] C. M. Lee, S. Bond, and P. Woollin, "Preferential weld corrosion: effects of weldment microstructure and composition”, in Proc. Corrosion/NACE International 2005, Houston, TX, USA, April 2005.
[7] J. W. Palmer, W. Hedges, J. L. Dawson, "The Use of Corrosion Inhibitors in Oil & Gas Production”, NACE International, TX, USA, 2004.
[8] I. G. Winning, D. Mcnaughtan, A.J. McMahon and N. Bretherton, "Evaluation of Weld Corrosion Behavior and the Application of Corrosion Inhibitors and Combined Scale/Corrosion Inhibitors”, NACE International, New Orleans, Louisiana, 2004.
[9] E. Gulbrandsen and A. Dugstad, "Guidelines for Filler-Material Selection To Minimize Preferential Weld Corrosion in Pipeline Steels”,in Proc. Corrosion 2005/NACE International, Houston, TX, USA, , 2005.
[10] K. Fushimi, A. Naganuma, K. Azumi, Y. Kawahara, "Current distribution during galvanic corrosion of carbon steel welded with type-309 stainless steel in NaCl solution”, Corrosion Science, vol. 50, pp. 903–911, March 2008.
[11] A. Chalmers, I. G. Winning, D. McNaughtan and S. McNeil, "Erosion-Corrosion of Carbon Steel Pipework on an Offshore Oil”, in Proc. Corrosion 2006, San Diego, CA, USA, 2006.
[12] K. Alawadhi, "Inhibition of Weld Corrosion in Flowing Brines Containing Carbon Dioxide”, PhD Thesis, Cranfield University, 2010.
[13] S. O. Otu, "Evaluation and performance of corrosion inhibitors for down-hole protection of welded steels”, MSc Thesis, Cranfield University, 2005.