Effect of HCO₃^- Concentration on CO₂ Corrosion in Gas and Oil Fields

Authors

Guo-An ZHANG, Corrosion and Protection Center, University of Science and Technology Beijing, Beijing 100083, ChinaFollow
Min-xu LU, Corrosion and Protection Center, University of Science and Technology Beijing, Beijing 100083, China
Yin-shun WU, Corrosion and Protection Center, University of Science and Technology Beijing, Beijing 100083, China

Corresponding Author

Guo-an ZHANG(zga2003@163.com)

Abstract

The effecs of HCO₃^- concentration on CO₂ corrosion in gas and oil fields were investigated by carrying out potentiodynamic scans and weight loss tests.Potentiodynamic polarization curves showed that the cathodic current density decreased with cm increase of HCO₃^- concentration when HCO₃^- was lower than 0.042(mol/L). The cathodic reations were promoted by increasing HCO₃^- when it reached 0.126 mol/L, Anodic behavior was an active process at low er [HCO₃^-] concentration and the anodic current density decreased with the increase of [HCO₃^-] concentration. An evident active-passive behavior exhibited in anodic process at 0.126 mol/L HCO₃^-. Under high pressure and high temperature, the corrosion rate of steel X65 decreased with the increase of HCO₃^- concentration while pH increased. SEM, EDS, XRD results of the corrosion scales indicated that a typical FeCO₃ crystallite was found at low HCO₃^- concentration but Ca(Fe,Mg)CO₃ at high HCO₃^- concentration. Ca²⁺, Mg²⁺precipitated prior to Fe²⁺ at high pH value.

Keywords

Oil and gas fields, CO2 corrosion, HCO3- concentration

DOI Link

https://doi.org/10.61558/2993-074X.1673

Publication Date

2005-11-28

Online Available Date

2005-11-28

Revised Date

2005-06-27

Received Date

2005-03-25

Recommended Citation

Guo-An ZHANG, Min-xu LU, Yin-shun WU. Effect of HCO₃^- Concentration on CO₂ Corrosion in Gas and Oil Fields[J]. Journal of Electrochemistry, 2005 , 11(4): 387-392.
DOI: 10.61558/2993-074X.1673
Available at: https://jelectrochem.xmu.edu.cn/journal/vol11/iss4/6