某油田ERW钢管管体泄漏失效分析  

Leakage Failure Analysis of the ERW Steel Pipeline in an Oilfield

作　　者：丛深 王志东 蔡克 瞿婷婷 仝珂 陈志昕 CONG Shen;WANG Zhidong;CAI Ke;QU Tingting;TONG Ke;CHEN Zhixin(CNPC Tubular Goods Research Institute,Xi′an,Shaanxi 710077,China;Material Supplying Department,Changqing Oilfield Company,PetroChina,Xi′an,Shaanxi 710016,China)

机构地区：[1]中国石油集团石油管工程技术研究院,陕西西安710077 [2]中国石油长庆油田分公司物资供应处(物资管理部),陕西西安710016

出　　处：《石油管材与仪器》2020年第1期60-64,共5页Petroleum Tubular Goods & Instruments

摘　　要：为分析东北某油田ERW钢管在输送油气过程中管体泄漏失效原因,对ERW钢管失效样品进行宏观形貌检验、理化检验、金相组织及扫描电镜分析等试验。结果表明,该ERW钢管管体泄漏失效的主要原因是管道底部残留积液和空气试压中的O2和CO2导致的腐蚀,腐蚀介质为大体积的O2和CO2在小体积的残留积液中形成持续饱和的腐蚀性水溶液,腐蚀类型为腐蚀产物膜的膜下腐蚀。建议对后续再建管线,试压前对管线进行热风吹扫;如果管线不及时投用,建议采用氮气保压。This paper gives a thorough investigation on the leakage reason of the ERW steel pipeline in an oil field.Through appearance inspection,physical and chemical inspection,metallographic inspection and scanning electron microscope(SEM),it is shown that the main reason is corrosion caused by residual liquid at the bottom of the pipeline and O2 and CO2 during air pressure test.The corrosion medium is large volume of O2 and CO2 forming continuously saturated corrosive aqueous solution in small volume of residual liquid,and the corrosion type is under-deposit corrosion.It is recommended to conduct hot air purging before pressure test for future pipelines.If the pipeline is not put into use in time,it is recommended to use nitrogen to maintain pressure.

关 键 词：ERW钢管 膜下腐蚀 穿孔刺漏 失效分析 

分 类 号：TE988[石油与天然气工程—石油机械设备]