GALVANIC CORROSION AND INHIBITOR SELECTION BETWEEN 13Cr-L-80 STEEL AND N-80 STEEL
摘 要
针对文昌13-1/2油田套管设计中采用的13Cr-L-80 和N-80两种钢材偶接的情况,采用挂片失重法研究了两种金属在弱酸性完井液中的电偶腐蚀,筛选了抑制该电偶腐蚀的缓蚀剂,并对其缓蚀性能进行了评价.结果表明,在60 ℃下弱酸性完井液中两种材料偶接时,13Cr-L-80钢腐蚀速度下降,N-80钢的腐蚀速度上升,产生了明显的电偶腐蚀效应.从9种缓蚀剂中筛选出JC-6,在加量1.5%时,13Cr-L-80和N-80偶接、60 ℃时腐蚀速度分别降至0.012和0.165 mm/a;质量比为9∶1的JC-6与PA复配物(代号JCP-6)使偶接钢材腐蚀速度进一步降低,在加量1.5%时,70 ℃时的腐蚀速度分别降至0.013和0.069 mm/a.
Abstract
Steel 13Cr-L-80 and N-80 was selected as casing materials at Wenchang 13-1/2 oil field.The galvanic corrosion of the two materials in completion fluid was studied by static weight-loss method and the proper inhibitor was selected.The corrosion rate of 13Cr-L-80 increased and that of N-80 decreased at 60℃,indicating the taking place of galvanic corrosion.Corrosion inhibitor JC-6 selected out of 9 commercial chemicals added at dosage 1.5% decreased the corrosion rate of 13Cr-L-80 coupled with N-80 at 60 ℃ to 0.012 and 0.165 mm/a respectively;JC-6 and PA in various combinations could decrease the corrosion rate further and in mass ratio 9∶1 (notated as JCP-6) at dosage of 1.5% could decrease the corrosion rate of the two metals at 70 ℃ to 0.013 and 0.069 mm/a respectively.
中图分类号 TG174.42
所属栏目 试验研究
基金项目
收稿日期 2006/3/10
修改稿日期 2006/4/21
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引用该论文: SHU Fu-chang. GALVANIC CORROSION AND INHIBITOR SELECTION BETWEEN 13Cr-L-80 STEEL AND N-80 STEEL[J]. Corrosion & Protection, 2007, 28(2): 70~72
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参考文献
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【6】SY/T 5329-1994.碎屑岩油藏注水水质推荐指标及分析方法[S].
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