某油田原油输送20钢管线弯头穿孔原因
Causes of Elbow Perforation of 20 Steel Pipeline for Crude Oil in an Oilfield
摘 要
采用宏微观形貌、化学成分、显微组织、腐蚀产物、水质、受力仿真等分析方法，研究了某油田原油输送20钢管线弯头的穿孔原因。结果表明：弯头内壁陶瓷涂层存在气孔、鼓泡等质量缺陷；且外弧面曲率较大处的壁厚最小，形成低洼区，原油中的水极易产生CaCO3水垢沉积在低洼区而引起垢下腐蚀。在弯头内部原油介质中CO2、H2S、硫酸盐还原菌和Cl-的协同作用下，在流体冲击力最大且涂层破损最严重的外弧面曲率较大区域形成腐蚀穿孔。
腐蚀
陶瓷涂层
失效分析
elbow
corrosion
ceramic coating
failure analysis
Abstract
Causes of elbow perforation of 20 steel pipeline for crude oil in an oil field were analyzed by microscopic/macroscopic morphology analysis, chemical composition analysis, metallographic analysis, corrosion product analysis, water quality analysis, and force simulation, and so on. The results show that the ceramic coating on inner wall surface of the elbow had some quality defects such as pores and bubbling. The thickness at relatively large curvature area of the outer arc was the smallest, forming a low-lying area. The water in the crude oil was easy to produce CaCO3 scales, which deposited in the low-lying area and the corrosion under scales occured. Under the synergistic action of CO2, H2S, sulfate-reducing bacteria and Cl- in the crude oil medium inside the elbow, corrosion perforation was formed in the area with large curvature of outer arc where the fluid impact force was the largest and the coating damage was the most serious.
中图分类号 TG174 DOI 10.11973/jxgccl202105019
所属栏目 失效分析
基金项目
收稿日期 2020/6/12
修改稿日期 2021/4/8
网络出版日期
作者单位点击查看
备注罗懿(1989-),女,四川广元人,工程师,硕士
引用该论文: LUO Yi,YANG Yang,JIANG Xiaobin,WANG Huazhong. Causes of Elbow Perforation of 20 Steel Pipeline for Crude Oil in an Oilfield[J]. Materials for mechancial engineering, 2021, 45(5): 105～110
罗懿,杨阳,蒋晓斌,王骅钟. 某油田原油输送20钢管线弯头穿孔原因[J]. 机械工程材料, 2021, 45(5): 105～110
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【9】陈建辉,吴冬阁,陆潇,等. 管道结垢预测技术研究[J]. 全面腐蚀控制,2020,34(1):5-7. CHEN J H,WU D G,LU X,et al. Research on scale prediction technology of pipeline[J]. Total Corrosion Control,2020,34(1):5-7.
【10】吕茜娣,廖柯熹,陈晓明,等. SRB对20碳钢在气田采出水中腐蚀行为的影响[J]. 材料保护,2019,52(8):88-94. LYU X D,LIAO K X,CHEN X M,et al. Effects of SRB on corrosion behavior of carbon steel 20 in produced water of gasfield[J]. Materials Protection,2019,52(8):88-94.
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【12】梁光川,聂畅,刘奇,等.基于FLUENT的输油管道弯头冲蚀分析[J].腐蚀与防护,2013,34(9):822-824. LIANG G C,NIE C,LIU Q,et al.Erosion-corrosion analysis of oil pipeline elbow based on FLUENT[J].Corrosion & Protection,2013,34(9):822-824.
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【14】张钧,赵国仙.某油井3Cr油管内壁腐蚀原因分析[J].材料保护,2019,52(10):153-157. ZHANG J,ZHAO G X.Corrosion analysis of 3Cr tubing in a well[J].Materials Protection,2019,52(10):153-157.
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