Science & Technology Review >

2014 , Vol. 32 >Issue 32: 67 - 71

DOI: https://doi.org/10.3981/j.issn.1000-7857.2014.32.011

Sediment in the Formation in Wet CO2 Environment of Pipeline and Quantitative Study of Its Corrosion Effect

  • ZHANG Jiangjiang ,
  • LIU Jining ,
  • GAO Qiuying ,
  • YANG Dongming ,
  • ZANG Hanyu ,
  • ZHANG Tao ,
  • XIAO Wenwen ,
  • JIANG Rui
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  • 1. Northwest Oilfield Company, China Petroleum & Chemical Corporation, Urumqi 830011, China;
    2. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

Received date: 2014-05-23

  Revised date: 2014-07-08

  Online published: 2014-11-27

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Abstract

This paper studies the influence of the wetting phase in CO2 corrosion environment with bottom sediments on the corrosion of pipeline. In the pipeline bottom, the wet analysis is conducted on the composition of brine, the sediment of scaling tendency, the sediment formation and the types of pipeline internal sediment. The electrochemical noise technique and the metallographic analysis are applied for the 20# low carbon steel in the wet CO2 environment, with no sediment covered under the potential noise, the current noise and the corrosion resistance noise, and the corrosion morphology is observed. The results show that, compared with the 20# carbon steel without sediments, the potential noise and current noise have a time-varying volatility in the wet CO2 environment, and the resistance noise is reduced by 87.5% ~95%. With the sediment removal and a regular monitoring of the corrosion inhibitor corrosion weight loss and corrosion and other parameters in laboratory and field experiments, the regular cleaning deposit and corrosion inhibitor levels of the 20# low carbon steel sheet, can, respectively, be reduced by 80%, 43%, and 57%, 92% for the point corrosion rate.

Key words： wet phase CO2; sediment; electrochemical noise; quantitative; corrosion of 20# carbon steel

Cite this article

ZHANG Jiangjiang , LIU Jining , GAO Qiuying , YANG Dongming , ZANG Hanyu , ZHANG Tao , XIAO Wenwen , JIANG Rui . Sediment in the Formation in Wet CO2 Environment of Pipeline and Quantitative Study of Its Corrosion Effect[J]. Science & Technology Review, 2014 , 32(32) : 67 -71 . DOI: 10.3981/j.issn.1000-7857.2014.32.011

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