Effect of H2S Partial Pressure on Stress Corrosion Cracking Behavior of 13Cr Stainless Steel in Annulus Environment Around CO2 Injection Well

doi:10.11902/1005.4537.2013.038

Journal of Chinese Society for Corrosion and protection

2014, Vol. 34

Issue (1): 46-52 DOI: 10.11902/1005.4537.2013.038

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Effect of H₂S Partial Pressure on Stress Corrosion Cracking Behavior of 13Cr Stainless Steel in Annulus Environment Around CO₂ Injection Well

WANG Feng^1,²(

), WEI Chunyan³, HUANG Tianjie^1,⁴, CUI Zhongyu⁵, LI Xiaogang⁵

1. National Energy CCS-EOR R&D (Experimental) Center, Songyuan 138000, China
2. Key Laboratory for Enhancing Oil Recovery of the Ministry of Education, Northeast Petroleum University, Daqing 163318, China
3. Fuyu Oil Production Plant, Jilin Oil Field Company, Songyuan 138003, China
4. Oil Production Technology Institute, Jilin Oil Field Company, Songyuan 138003, China
5. Corrosion and Protection Center, University of Science and Technology Beijing, Beijing 100083, China

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Abstract

Electrochemical characteristics and stress corrosion cracking (SCC) behavior of 13Cr stainless steel were investigated by electrochemical measurements, U-bent specimen immersion test and surface analysis technique in an artificial solution with an autoclave, which aimed to simulate the annulus environment around CO₂ injection well. The results showed that annulus solution around injection well was a complicated H₂S-CO₂-Cl^- environment which generated the SCC of 13Cr stainless steel. The pitting breakthrough potential and SCC resistance of 13Cr stainless steel decreased obviously with increasing H₂S partial pressure, which is associated with the deterioration of surface film (passive film and corrosion products scales) on the steel. When the H₂S partial pressure exceeded 0.20 MPa (including 0.20), SCC occurred on 13Cr steel. Typical transgranular and intergranular fracture morphologies were observed, which indicated that the SCC process was mixed-controlled by both anodic dissolution and hydrogen-induced cracking.

Key words: 13Cr stainless steel H₂S/CO₂ stress corrosion cracking H₂S partial pressure

Received: 24 April 2013

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Cite this article:

WANG Feng, WEI Chunyan, HUANG Tianjie, CUI Zhongyu, LI Xiaogang. Effect of H₂S Partial Pressure on Stress Corrosion Cracking Behavior of 13Cr Stainless Steel in Annulus Environment Around CO₂ Injection Well. Journal of Chinese Society for Corrosion and protection, 2014, 34(1): 46-52.

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https://www.jcscp.org/EN/10.11902/1005.4537.2013.038 OR https://www.jcscp.org/EN/Y2014/V34/I1/46

Fig.1 Optical micrograph of 13Cr stainless steel

Condition	Temperarure / ℃	pH	Corrosion inhibitor	CO₂ partial pressure / MPa	Total pressure / MPa	H₂S partial pressure / MPa	$P C O 2 / P H 2 S$
1	25	4.0	1×10^-³	4.0	9.0	0	---
2	25	4.0	1×10^-³	4.0	9.0	0.05	80
3	25	4.0	1×10^-³	4.0	9.0	0.10	40
4	25	4.0	1×10^-³	4.0	9.0	0.20	20
5	25	4.0	1×10^-³	4.0	9.0	0.30	13.3

Table 1 Test conditions of electrochemical measurements of 13Cr stainless steel

Fig.2 Polarization curves of 13Cr stainless steel under different H₂S partial pressures

Fig.3 EIS of 13Cr stainless steel under different H₂S partial pressures

(a) Nyquist diagram, (b) equivalent circuit

Table 2 Fitted electrochemical parameters for EIS of 13Cr stainless steel under different H₂S partial pressures

Fig.4 Variation of R_p, i_pass and R_f with increasing H₂S partial pressure

Fig.5 Macroscopic morphologies of 13Cr stainless steel U-bent specimen after immersion test:

(a) $P H 2 S$ =0 MPa, (b) $P H 2 S$ =0.10 MPa, (c) $P H 2 S$ =0.20 MPa, (d) $P H 2 S$ =0.30 MPa

Fig.6 Variation of failure time of 13Cr stainless steel with increasing H₂S partial pressure

Fig.7 SEM fractographs of U-bent specimen of 13Cr stainless steel under different H₂S partial pressures

(a, b) $P H 2 S$ =0.20 MPa, (c, d) $P H 2 S$ =0.30 MPa

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