CO2分压对S135钢在CO2/H2S共存体系中腐蚀行为的影响

高科超, 尚锁贵, 高强勇, 马金鑫, 张智, 刘婉颖

doi:10.16577/j.issn.1001-1560.2024.0035

材料保护 >

2024 , Vol. 57 >Issue 2: 67 - 75

DOI: https://doi.org/10.16577/j.issn.1001-1560.2024.0035

研究篇

CO₂分压对S135钢在CO₂/H₂S共存体系中腐蚀行为的影响

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¹中海石油(中国)有限公司天津分公司； ²西南石油大学油气藏地质及开发工程国家重点实验室； ³西南石油大学新能源与材料学院

刘婉颖(1983-)，博士，副教授，主要从事材料腐蚀与防护、井筒完整性与安全、纳米材料与纳米技术研究，电话:028-83037420，E-mail:liuwanyingxx＠163.com

收稿日期: 2023-04-22

修回日期: 2023-06-11

录用日期: 2023-06-20

网络出版日期: 2024-03-08

基金资助

国家自然科学基金联合基金项目(U22A20164)；油气藏地质及开发工程全国重点实验室(西南石油大学)项目(PLN2022-44)；四川省重点实验室开放课题项目(2022CL05)；中海石油(中国)有限公司天津分公司项目(CCL2021TJTONSTO777)

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Effect of CO₂ Partial Pressure on the Corrosion Behavior of S135 Steel in CO₂/H₂S Coexistence Systems

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(1.Exploration Department of Tianjin Branch of CNOOC (China)， Ltd.， Tianjin 300459， China；2a.State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation，2b.School of New Energy and Materials， Southwest Petroleum University， Chengdu 610500， China)

LIU Wanying(1983-)， Ph.D.， Associate Professor， Research Focus: Material Corrosion and Protection， Wellbore Integrity and Safety， Nanomaterials and Nanotechnology， Tel.:028-83037420，E-mail:liuwanyingxx＠163.com

Received date: 2023-04-22

Revised date: 2023-06-11

Accepted date: 2023-06-20

Online published: 2024-03-08

Supported by

National Natural Science Foundation Joint Fund Project (U22A20164)；Open Fund of State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation (Southwest Petroleum University)(PLN2022-44 )；Opening Project of Material Corrosion and Protection Key Laboratory of Sichuan Province (2022CL05)；CNOOC Tianjin Branch Project (CCL2021TJTONSTO777)

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摘要

为了给井下油气管材的选择和腐蚀预测模型的建立提供理论依据，利用高温高压反应釜进行S135 钢在CO2/H2S 共存体系中的腐蚀模拟试验，采用失重法、恒载荷法、X 射线衍射(XRD)、扫描电镜(SEM)、能谱(EDS)、三维轮廓扫描仪等手段研究了CO2分压对S135 钢在温度100 ℃、CO2/H2S 共存体系中腐蚀行为的影响及规律。结果表明，随CO2分压升高，S135 钢的腐蚀速率增大，屈服强度损伤加剧，CO2分压为5，10，15，20 MPa 时，其屈服强度(σs)损伤率分别为1.4%、3.6%、4.5%和15.9%；抗拉强度(σb)损伤率分别为1.2%、3.4%、5.2%和15.4%。 S135 钢在低CO2分压下发生全面腐蚀，随CO2分压增大发展为以全面腐蚀为主，辅以局部腐蚀。应力腐蚀裂纹在萌生阶段以局部阳极溶解作用(点蚀)为主，随CO2分压增大应力腐蚀裂纹更易生长，应力腐蚀敏感性增加，加剧了基体的腐蚀进程。

关键词： CO2分压; S135 钢; CO2/H2S; 失重腐蚀; 应力腐蚀

本文引用格式

高科超, 尚锁贵, 高强勇, 马金鑫, 张智, 刘婉颖 . CO₂分压对S135钢在CO₂/H₂S共存体系中腐蚀行为的影响[J]. 材料保护, 2024 , 57(2) : 67 -75 . DOI: 10.16577/j.issn.1001-1560.2024.0035

Abstract

In order to clarify the influence and regularity of CO2 partial pressure on the corrosion behavior of S135 steel in the CO2/H2S coexistence system， the corrosion simulation test of S135 steel in CO2/H2S coexistence systems was conducted by using high temperature and high pressure reactors.Meanwhile， the weight loss method， constant load method， X - ray diffraction (XRD)， scanning electron microscope(SEM)， energy spectroscopy (EDS) and three-dimensional profile scanner were used to study the effects of different CO2 partial pressures on the corrosion behavior rules of S135 steel in CO2/H2 S coexistence systems at 100 ℃.Results showed that as the CO2 partial pressure increased， the corrosion rate of S135 steel increased， and the yield strength damage became intensified.When the CO2 partial pressures were 5， 10， 15， and 20 MPa， the yield strength (σs) damage rate were 1.4%， 3.6%， 4.5%， and 15.9%， respectively.Additionally， the tensile strength (σb) damage rates were 1.2%， 3.4%， 5.2%and 15.4%， respectively.S135 steel underwent general corrosion under low CO2 partial pressure， and with the increase of CO2 partial pressure， the corrosion behavior developed into mainly general corrosion， supplemented by local corrosion.In the initiation stage， the stress corrosion cracking was dominated by local anodic dissolution (pitting corrosion).As the CO2 partial pressure increased， stress corrosion cracks were more likely to grow， and the stress corrosion sensitivity increased， which caused the corrosion process of the substrate became aggravated.

Key words： CO2 partial pressure; S135 steel; CO2/H2S; weightlessness corrosion; stress corrosion

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