External Corrosion of Buried Carbon Steel Pipelines in Oilfields

doi:10.11885/j.issn.1674-5086.2017.05.05.04

Abstract

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

CLC Number:

TE98

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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References

[1] CHEN Xu, WANG Guanfu, GAO Fengjiao, et al. Effects of sulphate-reducing bacteria on crevice corrosion in X70 pipeline steel under disbonded coatings[J]. Corrosion Science, 2015, 101(6):1-11. doi:10.1016/j.corsci.2015.06.015
[2] YAN Maocheng, SUN Cheng, XU Jin et al. Stress corrosion of pipeline steel under occluded coating disbondment in a red soil environment[J]. Corrosion Science, 2015, 93(1):27-38. doi:10.1016/j.corsci.2015.01.001
[3] COLE I S, MARNEY D. The science of pipe corrosion:A review of the literature on the corrosion of ferrous metals in soils[J]. Corrosion Science, 2012, 56(3):5-16. doi:10.1016/j.corsci.2011.12.001
[4] 李洪建,王闰,杜清珍,等. NR油田油井井筒腐蚀影响因素实验研究[J]. 西南石油大学学报(自然科学版), 2016, 38(1):146-151. doi:10.11885/j.issn.1674-5086.2013.11.06.02 LI Hongjian, WANG Run, DU Qingzhen, et al. Wellbore corrosion factors study in NR Oilfield[J]. Journal of Southwest Petroleum University (Science & Technology Edition), 2016, 38(1):146-151. doi:10.11885/j.issn.1674-5086.2013.11.06.02
[5] 罗金恒,张良,李丽锋,等. X90管道钢在NS4溶液中的电化学腐蚀行为[J]. 天然气工业, 2016, 36(6):92-97. doi:10.3787/j.issn.1000-0976.2016.06.014 LUO Jinheng, ZHANG Liang, LI Lifeng, et al. Electrochemical corrosion behaviors of the X90 linepipe steel in NS4 solution[J]. Natural Gas Industry, 2016, 36(6):92-97. doi:10.3787/j.issn.1000-0976.2016.06.014
[6] USHER K M, KAKSONEN A H, COLE I, et al. Critical review:Microbially influenced corrosion of buried carbon steel pipes[J]. International Biodeterioration & Biodegradation, 2014, 93(93):84-106. doi:10.1016/j.ibiod.2014.-05.007
[7] DONG C F, FU A Q, LI X G, et al. Localized EIS characterization of corrosion of steel at coating defect under cathodic protection[J]. Electrochimica Acta, 2008, 54(2):628-633. doi:10.1016/j.electacta.2008.07.016
[8] 郭安祥,胡尾娟,闫爱军,等. 不锈钢、镀锌钢接地材料在土壤中的腐蚀规律研究[J]. 材料导报,2015,29(S2):498-501. GUO Anxiang, HU Weijuan, YAN Aijun, et al. Research of corrosion rule on grounding materials of stainless steel and galvanized steel in soil[J]. Materials Review, 2015, 29(S2):498-501.
[9] SHERAR B W A, KEECH P G, SHOESIMTH D W. Carbon steel corrosion under anaerobic-aerobic cycling conditions in near-neutral pH saline solutions Part 1:Long term corrosion behaviour[J]. Corrosion Science, 2011, 53(11):3636-3642. doi:10.1016/j.corsci.2011.07.015
[10] JAVIDI M, HOREH S B. Investigating the mechanism of stress corrosion cracking in near-neutral and high pH environments for API 5L X52 steel[J]. Corrosion Science, 2014, 80(3):213-220. doi:10.1016/j.corsci.2013.11.031
[11] USHERA K M, KAKSONENA A H, BOUQUET D, et al. The role of bacterial communities and carbondioxide on the corrosion of steel[J]. Corrosion Science, 2015, 98(1):354-365. doi:10.1016/j.corsci.2015.05.043
[12] YAGHI N, HARTIKAINEN H. Enhancement of phosphorus sorption onto light expanded clay aggregates by means of aluminum and iron oxide coatings[J]. Chemosphere, 2013, 93(9):1879-1886. doi:10.1016/j.chemosphere.-2013.06.059
[13] CAO XiaoHui, TAN Yuzhuo, MENG Jinhong, et al. Synthesis process of Ba-ferrites from α-FeOOH and γ-FeOOH and investigation of magnetic properties[J]. Chinese Science Bulletin, 2010, 55(18):1952-1956. doi:10.1007/s11434-009-3624-3
[14] 翁诗甫,徐怡庄. 傅里叶变换红外光谱分析[M]. 北京:化学工业出版社, 2016.
[15] WANG Xiaoming, ZHU Mengqiang, LAN Shuai, et al. Formation and secondary mineralization of ferrihydrite in the presence of silicate and Mn(Ⅱ)[J]. Chemical Geology,2015, 415(15):37-46. doi:10.1016/j.chemgeo.2015.09.-009
[16] 徐轶群,杨明,何成达,等. 铁的氢氧化合物稳定相α, β-FeOOH的表征及光谱分析[J]. 光谱学与光谱分析,2013,33(12):3330-3333. doi:10.3964/j.issn.1000-0593(2013)12-3330-04 XU Yiqun, YANG M, HE Chengda, et al. Characterization and spectral analysis of the stable mineral phases α, β-FeOOH included iron oxyhydroxides[J]. Spectroscopy and Spectral Analysis, 2013, 33(12):3330-3333. doi:10.-3964/j.issn.1000-0593(2013)12-3330-04
[17] 常建华,董绮功. 波谱原理及解析[M]. 3版. 北京:科学出版社, 2012.
[18] WANG Shengrong, DUN Cuiwei, LI Xiaogang, et al. Field corrosion characterization of soil corrosion of X70 pipeline steel in ared clay soil[J]. Progress in Natural Science (Materials International), 2015, 25(3):242-250. doi:10.1016/j.pnsc.2015.06.006
[19] SANCY M, GOURBEYRE Y, SUTTER E M M, et al. Mechanism of corrosion of cast iron covered by aged corrosion products:Application of electrochemical impedance spectrometry[J]. Corrosion Science, 2010, 52(4):1222-1227. doi:10.1016/j.corsci.2009.12.026
[20] STRATMANN M, MULLER J. The mechanism of the oxygen reduction on rust-covered metal substrates[J]. Corrosion Science, 1994, 36(2):327-359. doi:10.1016/0010-938X(94)90161-9
[21] KAMIMURA T, HARA S, MIYUKI H, et al. Composition and protective ability of rust layer formed on weathering steel exposed to various environments[J]. Corrosion Science, 2006, 48(9):2799-2812. doi:10.1016/j.corsci.-2005.10.004
[22] 曹楚南. 腐蚀电化学原理[M]. 3版. 北京:化学工业出版社, 2008.
[23] ALIZADEH M, BORDBAR S. The influence of microstructure on the protective properties of the corrosion product layer generated on the welded API X70 steel in chloride solution[J]. Corrosion Science, 2013, 70:170-179. doi:10.1016/j.corsci.2013.01.026
[24] 胡家元,曹顺安,谢建丽. 锈层对海水淡化一级反渗透产水中碳钢腐蚀行为的影响[J]. 物理化学学报, 2012, 28(5):1153-1162. doi:10.3866/PKU.-WHXB201203022 HU Jiayuan, CAO Shun'an, XIE Jianli. Effect of rust layer on the corrosion behavior of carbon steel in reverse osmosis product water[J]. Acta Physico-Chimica Sinica, 2012, 28(5):1153-1162. doi:10.3866/PKU.WHXB201203022
[25] 孙敏,肖葵,董超芳,等. 带腐蚀产物超高强度钢的电化学行为[J]. 金属学报, 2011, 47(4):442-448. doi:10.3724/sp.j.1037.2010.00466 SUN Min, XIAO Kui, DONG Chaofang, et al. Electrochemical behaviors of ultra high strength steels with corrosion products[J]. Acta Metallugrica Sinica, 2011, 47(4):442-448. doi:10.3724/sp.j.1037.2010.00466