中国南海油气井隔水导管腐蚀规律研究
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摘要
目的针对我国南海海域使用过的六种材质隔水导管,系统性地分析其在60、90、180d三个腐蚀周期及在大气区、飞溅区、潮差区、全浸区四个区带的腐蚀行为与腐蚀规律,为我国南海隔水导管材质优选提供理论依据。方法首先,开展室内实验模拟海洋腐蚀环境,通过SEM扫描分析隔水导管在大气区、飞溅区、潮差区及全浸区的腐蚀特点,并针对六种材质挂片在四个区带的腐蚀速率开展研究,最后基于动电位极化与电化学阻抗技术分析隔水导管的抗腐蚀性能。结果飞溅区与潮差区的腐蚀程度相比大气区及全浸区更严重,且飞溅区、潮差区及全浸区三个区带的腐蚀产物主要为γ-FeO(OH);180 d时大气区平均腐蚀速率约0.0651～0.0976 mm/a,飞溅区约0.3924～0.4857 mm/a,潮差区约0.3482～0.4281 mm/a,全浸区约0.1714～0.2109 mm/a。六种材料容抗弧大小为X80 The work aims to systematically analyze the corrosion behavior and law of six different kinds of materials at four corrosion zones(atmospheric zone, splash zone, tide zone, and full immersion zone) and in three corrosion cycles(60 d, 90 d,and 180 d) so as to provide theoretical basis for the future material optimization of conductor in the South China Sea. Firstly,indoor immersion tests were carried out to simulate marine corrosion environment, and analyze the corrosion behavior of conductor at atmospheric zone, splash zone, tide zone and full immersion zone respectively by SEM scanning the corrosion coupons. Secondly, the corrosion rate of the six materials at four corrosion zones was studied and finally, the corrosion resistance of the six materials was investigated by potential polarization, and electrochemical impedance techniques. The corrosion forms of coupons were mainly general corrosion. The corrosion degree at the splash zone and the tide zone was more serious than that at the atmospheric zone and the full immersion zone, and the corrosion products of the splash zone, tide zone and full immersion zone were mainly γ-FeO(OH). After testing for 180 d, the corrosion rate at atmospheric zone was 0.0651～0.0976 mm/a,0.3924～0.4857 mm/a at splash zone, 0.3070～0.3783 mm/a at tide zone, and 0.1714～0.2109 mm/a at full immersion zone. The size relationship of condensance arc of the six materials was X80< X70< X65< X60< X56< X52. From the polarization curves,the higher the degree of steel is, the greater the density of corrosion current and the faster the corrosion rate will be. Under the experimental conditions, the conductor corrosion forms of South China Sea are mainly corrosion and oxygen corrosion, and the conductor coupons of X52 material have a slower corrosion rate and are stronger on corrosion resistance than X80 material.
引文
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[2]袁光宇.我国海上钻井隔水导管使用现状及发展趋势[J].长江大学学报(自然科学版),2012,9(7):102-103.YUAN Guang-yu.Current status and development trend of offshore drilling riser in china[J].Journal of Yangtze University,2012,9(7):102-103.
[3]侯保荣,张盾,王鹏.海洋腐蚀防护的现状与未来[J].中国科学院院刊,2016,31(12):1326-1331.HOU Bao-rong,ZHANG Dun,WANG Peng.Marine corrosion and protection:Current status and prospect[J].Bulletin of Chinese Academy of Sciences,2016,31(12):1326-1331.
[4]陈兴伟,吴建华,王佳,等.电偶腐蚀影响因素研究进展[J].腐蚀科学与防护技术,2010,22(4):363-366.CHEN Xing-wei,WU Jian-hua,WANG Jia,et al.Progress in research on factors influencing galvanic corrosion behavior[J].Corrosion science and protection technology,2010,22(4):363-366.
[5]闫伟,邓金根,袁俊亮,等.油套管钢长周期CO2腐蚀速率的测试及准确计算方法[J].材料保护,2014,47(8):71-74.YAN Wei,DENG Jin-gen,YUAN Jun-liang,et al Method for accurate calculation of corrosion rate of oil tubing steel induced by long-term carbon dioxide exposure[J].Journal of materials protection,2014,47(8):71-74.
[6]邢希金,周建良,刘书杰,等.中国近海油管防腐设计方法优化与防腐新策略[J].中国海上油气,2014(6):75-79.XING Xi-jin,ZHOU Jian-liang,LIU Shu-jie,et al.Design method optimization and new strategy for tubing and casing anti-corrosion in china offshore[J].China offshore oil and gas,2014(6):75-79.
[7]闫伟,邓金根,邓福成,等.油套管力学-化学腐蚀规律分析[J].中国海上油气,2014,26(1):87-91.YAN Wei,DENG Jin-gen,DENG Fu-cheng,et al.Discussion of mechanical-chemical corrosion in OCTG anticorrosion design[J].China offshore oil and gas,2014,26(1):87-91.
[8]张勇,汪海波,郭勇.中国南海某油田油井隔水套管腐蚀失效探究[J].全面腐蚀控制,2017,31(3):67-72.ZHANG Yong,WANG Hai-bo,GUO Yong.Study on corrosion failure of riser in oil wells in one oilfield of china south ocean[J].Total corrosion control,2017,31(3):67-72.
[9]林海,许杰,范白涛,等.L80钢在CO2/H2S腐蚀环境中的力学特性[J].表面技术,2016,45(5):91-96.LIN Hai,XU Jie,FAN Bai-tao,et al.Mechanical properties of L80 steel in CO2/H2S environment[J].Surface technology,2016,45(5):91-96.
[10]孙爱平,申洪臣,李强,等.海上某油田油井套管腐蚀失效原因[J].腐蚀与防护,2014,35(1):102-106.SUN Ai-ping,SHEN Hong-chen,LI Qiang,et al.Corrosion failure reason of oil well casing pipe at an oil platform[J].Corrosion&protection,2014,35(1):102-106.
[11]刘智勇,贾静焕,杜翠薇,等.X80和X52钢在模拟海水环境中的腐蚀行为与规律[J].中国腐蚀与防护学报,2014,34(4):327-332.LIU Zhi-yong,JIA Jing-huan,DU Cui-wei,et al.Corrosion behavior of X80 and X52 steels in simulated seawater environments[J].Journal of Chinese society for corrosion and protection,2014,34(4):327-332.
[12]廖柯熹,黄琳钧,王丹丹,等.X65管线钢在模拟海水环境中的腐蚀行为[J].腐蚀与防护,2017,38(11):856-861.LIAO Ke-xi,HUANG Lin-jun,WANG Dan-dan,et al.Corrosion behavior of X65 pipeline steel in simulated seawater environment[J].Corrosion and protection,2017,38(11):856-861.
[13]高杨,孙虎元,孙立娟.X80管线钢在黄海海水中的初期腐蚀行为[J].腐蚀与防护,2018,39(5):5-9.GAO Yang,SUN Hu-yuan,SUN Li-juan.Initial corrosion behavior of X80 pipeline steel in the yellow sea[J].Corrosion and protection,2018,39(5):5-9.
[14]宋峥嵘,杨风艳,徐善辉,等.电弧喷涂铝涂层对隔水管腐蚀疲劳行为的影响机理[J].中国造船,2013(2):378-384.SONG Zheng-rong,YANG Feng-yan,XU Shan-hui,et al.Effects of arc spraying aluminum coating on corrosion fatigue of riser[J].Shipbuilding of China,2013(2):378-384.
[15]CERIT M,GENEL K,EKSI S.Numerical investigation on stress concentration of corrosion pit[J].Engineering failure analysis,2009,16(7):2467-2472.
[16]WANG Y,ZHAO W,AI H,et al.Effects of strain on the corrosion behavior of X80 steel[J].Corrosion science,2011,53(9):2761-2766.
[17]FATAH M C,ISMAIL M C,ARI-WAHJOEDI B,et al.Effects of sulphide ion on the corrosion behavior of X52steel in a carbon dioxide environment at temperature40℃[J].Materials chemistry&physics,2011,127(1):347-352.
[18]LI Chun-fu,DAI Jia-lin,WANG Bing,et al.Studies of composition and structure of CO2 corrosion film of X56steel in the medium of CO2 and salt water[C]//14th congress of international federation for heat treatment and surface engineering.Shanghai:[s.n.],2004:1237-1241.
[19]韩玉梅,韩思厚,郑宇礼,等.X56管线钢的腐蚀疲劳寿命试验研究[J].机械强度,1994(1):77-79.HAN Yu-mei,HAN Si-hou,ZHENG Yu-li,et al.Study on corrosion fatigue life in X56 steel[J].Journal of mechanical strength,1994(1):77-79.
[20]张国军,潘治国,段占军,等.X60管线钢腐蚀疲劳裂纹扩展特性[J].石油化工腐蚀与防护,2001,18(1):53-56.ZHANG Guo-jun,PAN Zhi-guo,DUAN Zhan-jun,et al.Characteristics of corrosion fatigue crack propagation of X60 pipeline steel[J].Petrochemical corrosion and protection,2001,18(1):53-56.
[21]殷启帅,杨进,杨宇平,等.海上油田注水开采中H2S成因及油管腐蚀分析[J].表面技术,2017,46(9):171-178.YIN Qi-shuai,YANG Jin,YANG Yu-ping,et al.Origin of H2S and corrosion analysis of tubing in offshore oilfield flooding[J].Surface technology,2017,46(9):171-178.
[22]陈长风,路民旭,赵国仙,等.N80油套管CO2腐蚀产物膜的力学性能[J].金属学报,2003,39(2):175-181.CHEN Chang-feng,LU Min-xu,ZHAO Guo-xian,et al.Mechanical properties of CO2 corrosion scale on N80 well tube steel[J].Acta metallurgica sinica,2003,39(2):175-181.
[23]谭才渊,殷启帅,杨进,等.渤海某油田L80油管腐蚀机理研究[J].表面技术,2017,46(3):236-245.TAN Cai-yuan,YIN Qi-shuai,YANG Jin,et al.Corrosion mechanism of l80 tubing in a Bohai oilfield[J].Surface technology,2017,46(3):236-245.
[24]乔宏霞,路承功,李琼,等.基于不同胶凝材料钢筋混凝土耐腐蚀性试验研究[J].硅酸盐通报,2018,37(1):25-34.QIAO Hong-xia,LU Cheng-gong,LI Qiong,et al.Experimental study on corrosion resistance of reinforced concrete based on different cementitious materials[J].Bulletin of the Chinese ceramic society,2018,37(1):25-34.