多元热流体注采用N80钢管柱的腐蚀行为  

Corrosion Behavior of N80 Steel Tube for Multiple Thermal-Fluid Injection

作　　者：刘金璐 李军[1] 李丽[2] 李甫 李辉 杨宏伟[1] 连威[1] LIU Jinlu;LI Jun;LI Li;LI Fu;LI Hui;YANG Hongwei;LIAN Wei(College of Petroleum Engineering,China University of Petroleum(Beijing),Beijing 102249,China;CNPC Xinjiang Oil Field,Karamay 834000,China;Sichuan Baoshihua Xinsheng Oil&Gas Operation Service Company Ltd.,Chengdu 610056,China;CNPC Southwest Oil&Gas Field CDB Operating Company,Chengdu 610021,China)

机构地区：[1]中国石油大学(北京)石油工程学院,北京102249 [2]中国石油新疆油田分公司,克拉玛依834000 [3]四川宝石花鑫盛油气运营服务有限公司,成都610056 [4]中国石油西南油气田川东北作业分公司,成都610021

出　　处：《机械工程材料》2023年第5期20-25,共6页Materials For Mechanical Engineering

基　　金：国家自然科学基金重点项目(51734010,51334003);国家自然科学基金联合基金资助项目(U22B2072,U22B6003);国家自然科学基金重大科研仪器研制项目(52227804);国家自然科学基金青年科学基金资助项目(52104012);中国石油天然气集团有限公司-中国石油大学(北京)战略合作科技专项项目(ZLZX2020-01)。

摘　　要：通过多元热流体注采现场井下挂环表面腐蚀产物形貌和成分的分析,提出了N80钢管柱的腐蚀机理,并通过现场失效管柱的成分分析进行验证;用实验室模拟腐蚀试验研究了多元热流体温度(120~280℃)、CO_(2)分压(2~18 MPa)和O_(2)分压(0~1 MPa)对管柱腐蚀行为的影响。结果表明:管柱的腐蚀反应分为CO_(2)腐蚀、O_(2)腐蚀和氢腐蚀3类,现场失效管柱碳含量低于标准要求,验证了腐蚀机理的正确性。随着温度升高,管柱的腐蚀速率先增大后减小再增大;随着CO_(2)分压增大,腐蚀速率先基本不变后增大再趋于稳定;随着O_(2)分压增大,腐蚀速率先急剧增大后趋于稳定。The corrosion mechanism of N80 steel tube was proposed through the analysis of morphology and composition of corrosion products on surface of hanging rings at multiple thermal-fluid injection site,and was verified by the composition analysis of the failed tube at site.The effect of temperature(120-280℃)of multiple thermal-fluid,CO_(2)partial pressure(2-18 MPa)and O_(2)partial pressure(0-1 MPa)on the corrosion behavior of the tube was studied by laboratory simulation corrosion tests.The results show that the corrosion reaction of the tube included CO_(2)corrosion,O_(2)corrosion and hydrogen corrosion.The carbon content of the failed tube at site was lower than the standard requirements,verifying the correctness of the corrosion mechanism.With increasing temperature,the corrosion rate of the tube increased first,then decreased and then increased.With increasing CO_(2)partial pressure,the corrosion rate basically unchanged,then increased and then stabilized.With increasing O_(2)partial pressure,the corrosion rate sharply increased first and then stabilized.

关 键 词：多元热流体 N80钢管柱 挂环 腐蚀机理 

分 类 号：TG147[一般工业技术—材料科学与工程]