摘要
为提高管道完整性管理水平,通过化学成分分析、金相组织观察、单轴拉伸实验、电化学腐蚀实验和挂片失重实验等手段,分析20号钢、20G钢和L360钢在油田环境下的耐蚀特性,并对碳钢管道的安全运行提出防腐措施。结果表明,L360钢的有益元素较多,有害元素较少;不同管材产生了以铁素体为阳极,珠光体或渗碳体为阴极的电化学腐蚀过程;均匀腐蚀速率从大到小顺序为20号钢、20G钢、L360钢,最大点蚀速率从大到小顺序为20G钢、20号钢、L360钢,L360钢的耐蚀性最好;对于轻度腐蚀的管道可采用添加缓蚀剂和动态监测的方法,对于中度和重度腐蚀的管道可采用内穿插修复、风送挤涂修复和局部补强等技术对管道本体和防腐层缺陷进行修复;应用后,管道失效率有所降低,每年可减少损失455.3万元,且产生的环保效益不可估量。
In order to improve the management level of pipeline integrity,the corrosion resistance characteristics of 20 steel,20G steel and L360 steel in oilfield environment are analyzed by means of chemical composition analysis,metallographic tissue observation,single axis tensile experiment,electrochemical corrosion experiment and weightlessness experiment and other means,and the anti-corrosion measures for the safe operation of carbon steel pipeline are put forward.The results show that L360 steel has more beneficial elements and less harmful elements.The different tubes is produced the electrochemical corrosion process with ferrite as anode and pearlite or carburite as cathode.The order of uniform corrosion rate from large to small is 20 steel、20G steel、L360 steel,and the order of maximum pitting rate from large to small is 20G steel、20 steel、L360 steel.Among them,L360 steel has the best corrosion resistance.For mildly corroded pipelines,the method of adding corrosion inhibitors and dynamic monitoring can be adopted.For moderately and severely corroded pipelines,it can be used techniques including internal interpolation repair,wind extrusion coating repair and local reinforcement to repair defects of pipeline body and anti-corrosion layer.After the application,the failure rate of pipeline is obviously decreased and the loss is reduced by 4553000 yuan every year with incalculable environmental benefits.
作者
王金梭
WANG Jinsuo(No.5 Oil Production Plant of Daqing Oilfield Co.,Ltd.)
出处
《石油石化节能》
2023年第5期44-48,共5页
Energy Conservation in Petroleum & PetroChemical Industry
关键词
碳钢
耐蚀性
防腐
铁素体
修复技术
carbon steel
corrosion resistance
anti-corrosion
ferrite
repair technology
