N80、45~#、20~#钢在京11区块注入水中的腐蚀规律
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摘要
目的研究三种油田常用材质N80、45~#、20~#钢在华北油田京11断块注入水中的腐蚀行为。方法采用离子色谱法对京11断块注入水进行水质分析,采用失重法和电化学极化曲线测试方法研究了N80、45~#、20~#钢管材在华北油田京11断块注入水中的腐蚀规律与腐蚀机理,并对试样腐蚀前后的形貌进行了记录分析。结果当注入水中的碳酸钠质量浓度为1000 mg/L和4000 mg/L时,45~#、20~#和N80三种试样的腐蚀速率较大,45~#钢的腐蚀速率最大,为0.1322 mm/a,且试样表面均产生了明显的腐蚀坑及大量腐蚀产物;当碳酸钠质量浓度为12 000 mg/L和20 000 mg/L时,3种试样的腐蚀速率很小,远远低于0.076 mm/a,且试样表面几乎不产生腐蚀产物。结论当京11断块注入水中的碳酸钠投加量低于12 000 mg/L时,管柱的腐蚀较严重;当碳酸钠投加量高于12 000 mg/L时,管柱的腐蚀较为轻微,并且在相同的腐蚀环境下,N80钢比20~#、45~#钢具有更好的耐蚀性能。
The work aims to study corrosion behavior of three common oilfield materials-N80, 45~# and 20~# steels in injected water of Jing 11 fault block of Huabei Oilfield. The ion content of injecting water was analyzed by ion chromatography. Corrosion law and mechanism of the three ordinary materials of steel pipe injected to water of Jing 11 fault block of Huabei Oilfield were studied by virtue of weight-loss method and electrochemical polarization curve tests. Moreover, morphology of the speci-mens before and after corrosion was recorded and analyzed. When the mass concentration of sodium carbonate injected to water was 1000 mg/L or 4000 mg/L, 45~#, 20~# and N80 demonstrated higher corrosion rate, and 45~# specimen demonstrated maximum corrosion rate of 0.1322 mm/a. In addition, many obvious corrosion pits and a plenty of corrosion products were present on the surface of specimens. When the concentration of sodium carbonate was 12 000 mg/L or 20 000 mg/L, the corrosion rates of three specimens were very low and much lower than 0.076 mm/a, little corrosion product was produced on the surface of specimens. The corrosion is very serious when the additive amount of sodium carbonate injected to water is lower than 12 000 mg/L. The corrosion of pipe column is very slight and N80 steel demonstrates better corrosion resistance than 45~# and 20~# in the same corrosion environment when the additive amount of sodium carbonate is higher than 12 000 mg/L.
The work aims to study corrosion behavior of three common oilfield materials-N80, 45~# and 20~# steels in injected water of Jing 11 fault block of Huabei Oilfield. The ion content of injecting water was analyzed by ion chromatography. Corrosion law and mechanism of the three ordinary materials of steel pipe injected to water of Jing 11 fault block of Huabei Oilfield were studied by virtue of weight-loss method and electrochemical polarization curve tests. Moreover, morphology of the speci-mens before and after corrosion was recorded and analyzed. When the mass concentration of sodium carbonate injected to water was 1000 mg/L or 4000 mg/L, 45~#, 20~# and N80 demonstrated higher corrosion rate, and 45~# specimen demonstrated maximum corrosion rate of 0.1322 mm/a. In addition, many obvious corrosion pits and a plenty of corrosion products were present on the surface of specimens. When the concentration of sodium carbonate was 12 000 mg/L or 20 000 mg/L, the corrosion rates of three specimens were very low and much lower than 0.076 mm/a, little corrosion product was produced on the surface of specimens. The corrosion is very serious when the additive amount of sodium carbonate injected to water is lower than 12 000 mg/L. The corrosion of pipe column is very slight and N80 steel demonstrates better corrosion resistance than 45~# and 20~# in the same corrosion environment when the additive amount of sodium carbonate is higher than 12 000 mg/L.
引文
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[2]杨喜龙.三元复合驱采油技术进展[J].化学工程与装备,2015,8:062.YANG Xi-long.Advances in the Technology of Compound Flooding of Three Elements[J].Chemical Process and Equipment,2015,8:062.
[3]赵子刚,张玉荣.三元复合体系对井下金属管柱的腐蚀研究[J].材料保护,1999,32(12):27—28.ZHAO Zi-gang,ZHANG Yu-rong.Study on Corrosion of Underground Metal Pipe Column by Three Element Composite System[J].Material Protection,1999,32(12):27—28.
[4]毕凤琴,孙丽丽,王勇,等.钢在弱碱三元复合驱采出液中的腐蚀行为研究[J].科学技术与工程,2009,9(9):2318—2322.BI Feng-qin,SUN Li-li,WANG Yong,et al.Study of Corrosion Behavior of Steel in the Produced Liquid of Weakly Basic ASP Flooding[J].Science Technology and Engineering,2009,9(9):2318—2322.
[5]朱殿瑞,刘晓东,纪鹏荣,等.20#钢在三元复合驱弱碱体系采出液中的腐蚀与防护[J].腐蚀与防护,2008,29(2):71—73.ZHU Dian-rui,LIU Xiao-dong,JI Peng-rong,et al.Corrosion and Protection Steel in the Produced Liquid of Weakly Basic ASP Flooding[J].Corrosion and Protection,2008,29(2):71—73.
[6]李海玲,范汉香.A3钢在三元复合驱体系中的腐蚀行为研究[J].四川化工与腐蚀控制,1999,2(1):26—28.LI Hai-ling,FAN Han-xiang.Study of Corrosion Behaviour of A3 Steel in ASP Flooding[J].Sichuan Chemical and Corrosion Control,1999,2(1):26—28.
[7]费小丹,李明齐,许红梅,等.碳酸钠浓度对X70钢腐蚀行为的影响[J].腐蚀与防护,2007,27(12):624—626.FEI Xiao-dan,LI Ming-qi,XU Hong-mei,et al.Effect of Sodium Carbonate Concentration on the Corrosion Behaviour of X70 Steel.[J].Corrosion and Protection,2007,27(12):624—626.
[8]韩霞.Q235钢在三元驱油剂介质中的腐蚀特性研究[J].腐蚀与防护,2003,24(5):192—196.HAN Xia.Study of Corrosion Property of Q235 Steel in ASP Flooding Media[J].Corrosion and Protection,2003,24(5):192—196.
[9]杨卫国,徐君铭.(溶)氧腐蚀——一种容易被忽视的腐蚀形式[J].广州化工,2008(3).YANG Wei-guo,XU Jun-ming.Dissolved Oxygen Corrosion—An Easily Overlooked Form of Corrosion[J].Guangzhou Chemical Industry,2008(3).
[10]王磊,胡锐,王新虎,等.S135钻杆钢在钻井液中的氧腐蚀行为[J].石油机械,2006,34(10):1—4.WANG Lei,HU Rui,WANG Xin-hu,et al.Oxygen Corrosion Behaviour of S135 Drill Pipe Steel in Drill Fluid[J].Petroleum Machinery,2006,34(10):1—4.
[11]李连波.20Cr Mo抽油杆腐蚀机理研究[D].中国石油大学,2008.LI Lian-bo.Study on Corrosion Machanism of 20Cr Mo Sucker Rod[D].China University of Petroleum,2008.
[12]程海鹏,王东江.氧浓差电池在油井的腐蚀机理[J].石油化工腐蚀与防护,2014,31(1):46—49.CHENG Hai-dong,WANG Dong-jiang.Corrosion Mechanism of Differential Aeration Cell in Oil Well[J].Petrochemical Corrosion and Protection,2014,31(1):46—49.
[13]胡钢,许淳淳,池琳,等.HCO3-/CO32-浓度对X70管线钢钝化行为的影响[J].北京化工大学学报,2004,31(3):43—47.HU Gang,XU Chun-chun,CHI Lin,et al.Effect of HCO3-/CO32-Concentration on The Passivation Behavior of X70 Pipe Steel[J].Journal of Beijing University of Chemical Technology,2004,31(3):43—47.
[14]范林,李晓刚,杜翠薇,等.X80管线钢钝化膜在各种高浓度Na HCO3溶液中的电化学行为[J].中国腐蚀与防护学报,2012,32(4):322—326.FAN Lin,LI Xiao-gang,DU Cui-wei,et al.Electrochemical Behavior of Passive Film of X80 Pipeline Steel in All Kinds of High Concentration of Na HCO3.[J].Journal of Chinese Society for Corrosion and Protection,2012,32(4):322—326.
[15]董泽华,孟凡玲.聚合物—碱复合驱溶液中碳钢钝化行为研究[J].油田化学,1998,15(2):155—159.DONG Ze-hua,MENG Fan-ling.Study of Passivation Behavior of Steel in Polymer-Alkali ASP Solution.[J].Oilfield Chemistry,1998,15(2):155—159.