H2S/CO2共存体系气液相中P110钢的腐蚀行为

全青, 张源, 雷鸣, 夏杨, 刘婉颖

doi:10.16577/j.issn.1001-1560.2024.0101

材料保护 >

2024 , Vol. 57 >Issue 5: 50 - 60

DOI: https://doi.org/10.16577/j.issn.1001-1560.2024.0101

研究篇

H₂S/CO₂共存体系气液相中P110钢的腐蚀行为

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(1. 西安石油大学石油工程学院，陕西西安 710065；2. 长庆油田分公司第六采气厂，陕西西安 710021；3. 西南石油大学新能源与材料学院，四川成都 610500)

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

收稿日期: 2023-09-19

修回日期: 2023-11-12

录用日期: 2023-11-20

网络出版日期: 2024-05-31

基金资助

陕西省自然科学基金项目(2023 -JC-QN- 0467)；西安市科学技术协会青年人才托举计划项目(959202313079)资助

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Corrosion Behavior of P110 Steel in Vapor-Liquid Phase of H₂S/CO₂ Coexistence System

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(1. School of Petroleum Engineering，Xi’an Shiyou University，Xi’an 710065，China；2. Branch No. 6 Gas Production Plant，Changqing Oilfield，Xi’an 710021，China；3. 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: 2023-09-19

Revised date: 2023-11-12

Accepted date: 2023-11-20

Online published: 2024-05-31

Supported by

The Natural Science Basic Research Plan of Shaanxi Province (No.2023-JC-QN-0467)；Young Talent Fund of Xi’an Association for Science and Technology (959202313079)

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摘要

为了研究油套管在H₂S/CO₂共存体系高温高压环境气液相中的腐蚀行为及腐蚀机理，利用高温高压反应釜展开了油套管P110钢在CO₂/H₂S共存体系中的动态腐蚀模拟试验。采用失重法计算了试样的均匀腐蚀速率和点腐蚀速率，采用XRD、SEM/EDS、三维光学轮廓显微镜等手段研究了CO₂/H₂S共存体系中P110钢处于液相和气相中的腐蚀行为特征。结果表明：液相中P110钢的均匀腐蚀速率和点腐蚀速率分别为0.026 3 mm/a和0.208 1 mm/a,均大于在气相环境中P110钢的均匀腐蚀速率(0.014 8 mm/a)和点蚀速率(0.156 9 mm/a)。液相中P110钢表面生成的腐蚀产物主要为红褐色粉状疏松的FeCO₃,气相中P110钢表面所形成的腐蚀产物主要为FeCO₃和黑褐色致密均匀的FeS,FeS能抑制环境介质中CO₂、H₂S及Cl^-对基体材料的进一步腐蚀。P110钢在液相和气相中发生的腐蚀主要为均匀腐蚀，局部区域有点蚀，存在局部腐蚀倾向。

关键词： H₂S/CO₂; 气相; 液相; P110; 腐蚀

本文引用格式

全青, 张源, 雷鸣, 夏杨, 刘婉颖 . H₂S/CO₂共存体系气液相中P110钢的腐蚀行为[J]. 材料保护, 2024 , 57(5) : 50 -60 . DOI: 10.16577/j.issn.1001-1560.2024.0101

Abstract

For studying the corrosion behavior and mechanism of tubing in high temperature and pressure vapor-liquid phase of H₂S/CO₂ coexistence system, the dynamic corrosion simulation experiment of P110 steel for oil casing in CO₂/H₂S coexisting system was carried out using the high temperature autoclave. The uniform corrosion rates and pitting corrosion rates of samples were calculated by the weight loss method, and the corrosion behavior characteristics of P110 steel in liquid phase and gas phase of CO₂/H₂S coexistence system were analyzed and studied by XRD, SEM/EDS and 3D optical profile microscope. Results showed that the uniform corrosion rate and pitting corrosion rate of P110 steel in the liquid phase environment were 0.026 3 and 0.208 1 mm/a, respectively, which were higher than the uniform corrosion rate(0.014 8 mm/a) and pitting corrosion rate(0.156 9 mm/a) of P110 steel in the gas phase environment. Moreover, the corrosion products formed on the surface of P110 steel in the liquid phase environment were mainly red-brown powdery loose FeCO₃, and the corrosion products formed on the surface of P110 steel in the gas phase were mainly FeCO₃ and black-brown dense and uniform FeS. FeS inhibited the further corrosion of the base material from corrosive medium of CO₂, H₂S and Cl. Besides, the corrosion of P110 steel in liquid and gas phases was mainly uniform corrosion, with localized pitting and a tendency towards localized corrosion.

Key words： H₂S/CO₂; gas phase; liquid phase; P110; corrosion

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