油田埋地碳钢管道外腐蚀行为研究

doi:10.11885/j.issn.1674-5086.2017.05.05.04

西南石油大学学报(自然科学版) ›› 2018, Vol. 40 ›› Issue (4): 169-176.DOI: 10.11885/j.issn.1674-5086.2017.05.05.04

油田埋地碳钢管道外腐蚀行为研究

刘晓^1,2, 陈艳华¹, 钟卉元^1,2, 李六军³, 陈宇⁴

1. 华北理工大学建筑工程学院, 河北唐山 063210;
2. 唐山市排水工程技术研究中心, 河北唐山 063210;
3. 北京华远意通热力科技股份有限公司, 北京丰台 100070;
4. 中国石油大庆油田有限责任公司第九采油厂规划设计研究所, 黑龙江大庆 163853

收稿日期:2017-05-05 出版日期:2018-08-01 发布日期:2018-08-01
通讯作者: 陈艳华,E-mail:cyh427@163.com
作者简介:刘晓,1976年生,女,汉族,黑龙江大庆人,副教授,博士,主要从事油田化学方面的研究工作。E-mail:xiaoliu200401@163.com;陈艳华,1972年生,女,汉族,山东莱州人,教授,博士,主要从事金属腐蚀与防护以及生命线防灾减灾的研究工作。E-mail:cyh427@163.com;钟卉元,1982年生,女,满族,河北承德人,讲师,博士,主要从事污水及污泥化学处理的研究工作。E-mail:77786623@qq.com;李六军,1989年生,女,汉族,河北泊头人,硕士,主要从事市政节能产品的研发、方案设计与应用的工作。E-mail:liliujun890608@163.com;陈宇,1985年生,男,汉族,辽宁辽中人,工程师,主要从事油田腐蚀与防护管理工作。E-mail:dq_chenyu@petrochina.com.cn
基金资助:
国家自然科学基金（51378172）；河北省自然科学基金（E2014209089）

External Corrosion of Buried Carbon Steel Pipelines in Oilfields

LIU Xiao^1,2, CHEN Yanhua¹, ZHONG Huiyuan^1,2, LI Liujun³, CHEN Yu⁴

1. College of Civil and Architectural Engineering, North China University of Science and Technology, Tangshan, Hebei 063210, China;
2. Drainage Engineering Research Center of Tangshan, Tangshan, Hebei 063210, China;
3. Beijing Huayuanyitong Thermal Technology Co. Ltd., Fengtai, Beijing 100070, China;
4. Planning and Design Institute of No.9 Oil Production Company, Daqing Oilfield Company Ltd., PetroChina, Daqing, Heilongjiang 163853, China

Received:2017-05-05 Online:2018-08-01 Published:2018-08-01

摘要/Abstract

摘要： 针对大庆油田龙虎泡作业区埋地碳钢管道外腐蚀较为严重的情况，通过检测埋管防护层破损点周围土壤的物理、化学性质和硫酸盐还原菌（SRB）数量，分析土壤的腐蚀性。采用扫描电镜能谱（SEM-EDS）、X射线衍射（XRD）和红外光谱（IR）等技术对管道外壁腐蚀物的形貌、元素组成和矿物成分等进行了表征和分析。借助动电位极化曲线和电化学阻抗谱（EIS）进一步研究了埋地碳钢管道外壁在土壤浸出液中的腐蚀行为。结果表明，作业区潮湿的盐碱性土壤环境和复杂多变的土壤性质使该地区埋地碳钢管道发生腐蚀；腐蚀产物主要包括Fe₃O₄和FeOOH，其中FeOOH位于外层，Fe₃O₄位于内层；腐蚀产物通过参与阴极反应或充当大阴极来加剧管道腐蚀。

关键词: 埋地碳钢管道, 外腐蚀物, 土壤腐蚀性, 表征, 电化学测试

Abstract: With regard to the relatively severe external corrosion of buried carbon steel pipelines in the Longhupao operation zone of the Daqing Oilfield, soil corrosivity was analyzed by determining the physical properties, chemical properties, and counts of sulfate-reducing bacteria of soil around coating defects on the buried pipelines. The morphology, elemental composition, and mineral content of corrosion products on the external walls of the pipelines were characterized and analyzed using techniques such as scanning electron microscopy-energy dispersive x-ray spectrometry, x-ray diffraction, and infrared spectroscopy. By means of potentiodynamic polarization curves and electrochemical impedance spectroscopy, the corrosion behavior on the external walls of buried carbon steel pipelines in soil extract solution was further investigated. The results indicated that the corrosion of buried carbon steel pipelines in the zone was caused by the wet saline-alkali soil environment as well as complex and varying soil properties. The corrosion products were mainly Fe₃O₄ and FeOOH, located in the inner and outer layers, respectively. The corrosion products contributed to cathodic reactions or acted as large cathodes, further aggravating pipeline corrosion.

Key words: buried carbon steel pipelines, external corrosion products, soil corrosivity, characterization, electrochemical testing

中图分类号:

TE98

刘晓, 陈艳华, 钟卉元, 李六军, 陈宇. 油田埋地碳钢管道外腐蚀行为研究[J]. 西南石油大学学报(自然科学版), 2018, 40(4): 169-176.

LIU Xiao, CHEN Yanhua, ZHONG Huiyuan, LI Liujun, CHEN Yu. External Corrosion of Buried Carbon Steel Pipelines in Oilfields[J]. 西南石油大学学报(自然科学版), 2018, 40(4): 169-176.

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油田埋地碳钢管道外腐蚀行为研究

External Corrosion of Buried Carbon Steel Pipelines in Oilfields

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