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Journal of Chinese Society for Corrosion and protection  2023, Vol. 43 Issue (2): 371-376    DOI: 10.11902/1005.4537.2022.126
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Corrosion Behavior of P110S Oil Casing Steel in Sulfur Containing Environment
WAN Hongxia(), LIU Chonglin, WANG Zian, LIU Ru, CHEN Changfeng
School of New Energy and Materials, China University of Petroleum, Beijing 102249, China
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Abstract  

Casing is an important equipment in oil and gas production industry, at present, the oil casing steels used in the field are mainly K55, N80, L80-13Cr and P110 steel grade etc. With the development of oil and gas fields into deep formations, the casing services in H2S containing environment. Based on this condition, different concentrations of Na2S were used to simulate sulfur-containing environment, and the corrosion behavior of P110S steel was studied in sulfur-containing solutions by means of immersion test, electrochemical workstation scanning electron microscope, laser confocal microscope, XRD and Raman spectroscope. The results show that the P110S steel suffered from severe corrosion in sulfur-containing solutions. The corrosion rate and corrosion current density increased with sulfur concentration. The corrosion morphology changed from uniform corrosion to pitting corrosion, and the corrosion products were loose.
Key words:  oil casing      sulfur-containing environment      corrosion behavior     
Received:  25 April 2022      32134.14.1005.4537.2022.126
ZTFLH:  TG147  
Fund: National Natural Science Foundation of China(52101112)
About author:  WAN Hongxia, E-mail: wanhongxia88@163.com
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Hongxia WAN
Chonglin LIU
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Changfeng CHEN

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WAN Hongxia, LIU Chonglin, WANG Zian, LIU Ru, CHEN Changfeng. Corrosion Behavior of P110S Oil Casing Steel in Sulfur Containing Environment. Journal of Chinese Society for Corrosion and protection, 2023, 43(2): 371-376.

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https://www.jcscp.org/EN/10.11902/1005.4537.2022.126     OR     https://www.jcscp.org/EN/Y2023/V43/I2/371

Fig.1  SEM surface images of P110S steel after 7 d immersion in different solutions: (a) 4%NaCl+0.01 mol/L Na2S, (b) 4%NaCl+0.05 mol/L Na2S, (c) 4%NaCl+0.1 mol/L Na2S
Fig.2  CLSM surface (a-c) and SEM cross-sectional (d-f) images of P110S steel after 7 d immersion in different solutions: (a, d) 4%NaCl+0.01 mol/L Na2S, (b, e) 4%NaCl+0.05 mol/L Na2S, (c, f) 4%NaCl+0.1 mol/L Na2S
Fig.3  SEM images of P110S steel after 7 d immersion in 4%NaCl+0.01 mol/L Na2S (a), 4%NaCl+0.05 mol/L Na2S (b) and 4%NaCl+0.1 mol/L Na2S (c) solutions and then removing corrosion products
Fig.4  XRD patterns of corrosion products on the steel substrate (a) and in the solution (b)
Fig.5  Raman spectroscopies of the corrosion products
Fig.6  Nyquist plots (a), Bode plots (b, c) and polarization curves (d) of P110S steel in the solutions containing different concentrations of Na2S
Solution / mol·L-1Rs / Ω·cm2Qf / F·cm2Rf / Ω·cm2Qct / F·cm2Rct / Ω·cm2Icorr / μA·cm-2Ecorr / V
0.011.2333.61×10-64.3434.45×10-3553.333.58-0.7365
0.051.6121.66×10-63.0043.09×10-3352.254.81-0.7353
0.11.2971.39×10-63.0073.56×10-3328.961.78-0.7419
Table 1  Fitting results of EIS in Fig.6 and fitting results of polarization curves
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