H_(2)S/CO_(2)共存体系气液相中P110钢的腐蚀行为  

Corrosion Behavior of P110 Steel in Vapor-Liquid Phase of H_(2)S/CO_(2)Coexistence System

作　　者：全青 张源 雷鸣 夏杨 刘婉颖[3] QUAN Qing;ZHANG Yuan;LEI Ming;XIA Yang;LIU Wanying(School of Petroleum Engineering,Xi’an Shiyou University,Xi’an 710065,China;Branch No.6 Gas Production Plant,Changqing Oilfield,Xi’an 710021,China;School of New Energy and Materials,Southwest Petroleum University,Chengdu 610500,China)

机构地区：[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

出　　处：《材料保护》2024年第5期52-60,共9页Materials Protection

基　　金：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。

摘　　要：为了研究油套管在H_(2)S/CO_(2)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CO_(2)/H_(2)S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CO_(2)/H_(2)S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0.0263 mm/a和0.2081 mm/a,均大于在气相环境中P110钢的均匀腐蚀速率(0.0148 mm/a)和点蚀速率(0.1569 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FeCO_(3),气相中P110钢表面所形成的腐蚀产物主要为FeCO_(3)和黑褐色致密均匀的FeS,FeS能抑制环境介质中CO_(2)、H_(2)S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。For studying the corrosion behavior and mechanism of tubing in high temperature and pressure vapor-liquid phase of H_(2)S/CO_(2)coexistence system,the dynamic corrosion simulation experiment of P110 steel for oil casing in CO_(2)/H_(2)S 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 CO_(2)/H_(2)S 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 0.0263 and 0.2081 mm/a,respectively,which were higher than the uniform corrosion rate(0.0148 mm/a)and pitting corrosion rate(0.1569 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 FeCO_(3),and the corrosion products formed on the surface of P110 steel in the gas phase were mainly FeCO_(3) and black-brown dense and uniform FeS.FeS inhibited the further corrosion of the base material from corrosive medium of CO_(2),H_(2)S 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.

关 键 词：H_(2)S/CO_(2) 气相 液相 P110 腐蚀 

分 类 号：TG172[金属学及工艺—金属表面处理]