SZ36-1油田某低含CO_2水源井油管材料的选择  

Seclection of Tubing Materials for a Water Supply Well Containing Low CO_2 in SZ36-1 Oilfield

作　　者：陈华兴 赵学芬[2] 刘义刚 庞铭 赵顺超 CHEN Huaxing;ZHAO Xuefen;LIU Yigang;PANG Ming;ZHAO Shunchao(Tianjin Branch of CNOOC（China）Ltd.,Tianjin 300452,China;Chongqing Institute of Science and Technology,Chongqing 401331,China)

机构地区：[1]中海石油(中国)有限公司天津分公司,天津300452 [2]重庆科技学院,重庆401331

出　　处：《腐蚀与防护》2018年第8期629-633,共5页Corrosion & Protection

摘　　要：模拟SZ36-1油田某低含CO_2水源井生产油管的现场环境,在高温高压釜中对5种油管材料N80钢、3Cr钢、13Cr钢、超级13Cr钢以及钨钢进行72h腐蚀浸泡试验,确定油管材料的腐蚀速率,以比较各钢材的耐蚀性;采用光学显微镜观察试样腐蚀形貌,以评价各钢材的局部腐蚀情况;利用动电位极化曲线和电化学阻抗谱分析待选材料的电化学性能。结果表明:N80钢的腐蚀速率高达0.223mm/a,表面有大量点蚀坑,其电化学腐蚀反应受阳极活化控制,并且阻抗最小,不满足选材要求;钨钢因其较差的耐点蚀性也不满足要求;3Cr钢、13Cr钢和超级13Cr钢的腐蚀速率低,具有显著的阳极钝化特征,耐点蚀性好,电化学阻抗高,可以满足选材要求。Corrosion immersion tests were performed for 72 hin a high temperature autoclave under a simulated condition of a water supply well containing low CO2 in the SZ36-1 oilfield for five kinds of tubing material,N80 steel,3 Cr steel,13 Cr steel,super 13 Cr steel and tungsten steel.The corrosion rates obtained from corrosion immersion tests can be used to compare the corrosion resistance of the test steels.Corrosion morphology was observed by optical microscopy to evaluate localized corrosion situations for these steels.The electrochemical properties were analyzed by potentiodynamic polarization curves and electrochemical impedance spectrums.The results show that N80 steel cannot meet the requirements of material selection due to the high corrosion rate of 0.223 mm/a,a large number of pits on its surface,anodic activation controlling its electrochemical corrosion reaction and the smallest electrochemical impedance.Tungsten steel also cannot meet the requirements because of its poor resistance to pitting corrosion.3 Cr steel,13 Cr steel and super 13 Cr steel had low corrosion rates,significant anodic passivation characteristics,good pitting resistance,high electrochemical impedance.So these steels can meet the requirements of material selection.

关 键 词：水源井 油管钢 CO2腐蚀 极化曲线 阻抗谱 

分 类 号：TG174.2[金属学及工艺—金属表面处理]