Corrosion Behavior and Safety Analysis of 80S Steel in H₂S/CO₂ Environment

Abstract:

Cost factors must be considered in the development of Yan'an gas field. In order to evaluate the applicability of economical 80S steel in the sulfur gas reservoir environment of Yan'an gas field, the indoor corrosion test was conducted to evaluate the resistance of 80S steel to uniform corrosion and SCC resistance in CO₂/H₂S coexisting corrosion environment, and combined with relevant standards. The security was analyzed. The results show that the uniform corrosion rate of 80S steel is the largest at 50 °C, and it decreases first and then increases with the increase of temperature. When the loading stress is 496.8MPa (552MPa×90%),the test duration was 720h. One sample cracked and the other two parallel samples did not cracked Comprehensive anti-uniform corrosion performance and anti-SCC performance, it is believed that 80S steel has certain risks in the corrosive environment of Yan'an gas field. It needs to cooperate with other anti-corrosion measures and monitor the service of the well string at any time.

• Periodical: Materials Science Forum (Volume 944)
• Pages: 862-866
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.944.862
• Online since: January 2019
• Authors: Yong Qiang Zhang, Zhi Gang Yang*, Rui Min Gao, Li Liu, Zhi Fu Yin, Chuan Ta
• Keywords: 80S Steel, CO₂, H₂S, Stress Corrosion Cracking, Uniform Corrosion

References

[1] Wang Xiangzeng. Advances and prospects in oil and gas exploration and development of Shanxi Yanchang Petroleum (Group) Co., Ltd [J]. China Petroleum Exploration, 2018, 23(1): 36-43.

[2] Fan Yaping, Zhou Yinuo. Effects of H2S/CO2 Corrosion Scale on Corrosion Behavior of T95 Casing Steel at Different [J]. .Temperature. Surface Technology, 2016, 45(10): 180-186.

[3] Li Dongmei, Long Wu, Zou Ning. Corrosion Behavior of P110SS Anti-sulfer Pipeline Steel in Low H2S and High CO2 Partial Pressure Environment of Ultradeep Well [J]. Surface Technology, 2016, 45(7): 102-108.

[4] Li Jiameng. Study on the structure and properties of corrosion product membrane of P110SS steel[D]. Southwest Petroleum University, (2017).

[5] Wu Dandan, Xiao Qi, WANG Shutao, etal. Corrosion Behavior of Sulfide-resistant Casing Steel P110SS under Condition of High Containing H2S/CO2 and Cl-[J]. Corrosion & Protection, 2014, 35(2): 112-115.

[6] Wang B, Zhang J L, Bai J H, et al. Corrosion Behavior of BG80S Anti-Sulfur Oil Tube Steel in High Temperature High Pressure H2S/CO2 Environment[J]. Applied Mechanics & Materials, 2012, 151: 23-27.

DOI: 10.4028/www.scientific.net/amm.151.23

[7] DONG Xiaoming, Chen Ye-xin, ZHANG Zhonghua. Corrosion Behavior of H2S Resistant Steel in H2S Solution[J]. Corrosion & Protection, 2016, 37(10): 832-837.

[8] Ma Liying. Corrosion behavior and protection measures of 110 kinds of steel casing in acid oil and gas field[D]. Southwest Petroleum University, (2012).

[9] Zhang Zhiyuan, Mu Ruisan, Qi Yupei, etal. Effect of Inclusions on Hydrogen Sulfide Stress Corrosion Resistance of Casing[J]. Pipe steel, 2014, 43(6): 18-23.

[10] Xue Yan, Zhao Mifeng,Lv,Xianghong,etal. Stress Corrosion Cracking Evaluation Methods of Stainless Steel Tubing[J]. Corrosion & Protection, 2018, 39(5): 340-343.