火驱生产井牺牲阳极防腐实验研究
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摘要
火烧油层技术由于工艺复杂,现场实验时会遇到严重的腐蚀问题。改性牺牲阳极不但有一般阴极保护的特点,而且改性物质使阳极的反应物在管、杆表面形成保护膜,有效提高防腐效果。模拟火烧油层生产井的生产环境,采用自然腐蚀,考察普通和改性两种牺牲阳极保护的防腐技术效果。结果表明,改性牺牲阳极保护法起到了有效的缓腐作用,在温度较低的27℃时,普通牺牲阳极、改性牺牲阳极保护下的缓蚀率分别为6.04%和96.87%;而温度升高到110℃后,改性牺牲阳极的缓蚀率下降,但仍比普通阳极防腐效果好。
Due to the complex process of in situ combustion,serious corrosion problems will be encountered in field experiments. The modified sacrificial anode not only has the characteristics of general cathodic protection,but also can improve the corrosion resistance by forming a protective film on the surface of the tube and rod. By simulating the production environment of the production wells of in-situ combustion,the corrosion effect of two kinds of sacrificial anode protection was investigated by natural corrosion.The results show that the modified sacrificial anode protection method is effective in retarding the corrosion. In low temperature of 27 ℃,corrosion inhibition rate of common sacrificial anode protection and modified sacrificial anode protection are 6. 04% and 96. 87%; While the temperature increased to110 ℃,the corrosion inhibition rate of modified sacrificial anode protection decreased,but anticorrosion effect is still better than common cathodic protection.
Due to the complex process of in situ combustion,serious corrosion problems will be encountered in field experiments. The modified sacrificial anode not only has the characteristics of general cathodic protection,but also can improve the corrosion resistance by forming a protective film on the surface of the tube and rod. By simulating the production environment of the production wells of in-situ combustion,the corrosion effect of two kinds of sacrificial anode protection was investigated by natural corrosion.The results show that the modified sacrificial anode protection method is effective in retarding the corrosion. In low temperature of 27 ℃,corrosion inhibition rate of common sacrificial anode protection and modified sacrificial anode protection are 6. 04% and 96. 87%; While the temperature increased to110 ℃,the corrosion inhibition rate of modified sacrificial anode protection decreased,but anticorrosion effect is still better than common cathodic protection.
引文
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[2]李英,李淑兰,曹秋芳.火烧驱油过程中腐蚀因素分析及对策[J].特种油气藏,2005,12(5):101-103.
[3]韩霞.郑408块火烧驱油注气井腐蚀原因分析及对策[J].腐蚀科学与防护技术,2010(3):247-250.
[4]宁奎,袁士宝,蒋海岩.火烧油层理论与实践[M].东营:中国石油大学出版社,2010:158-159.
[5]卢绮敏.石油工业中的腐蚀与防护[M].北京:化学工业出版社,2001:87-130.
[6]胡衍利.牺牲阳极保护法在天然气管道防腐中的应用[J].硅谷,2010(24):121,175.
[7]王建才,闫旭光,刘金川.输油管道阴极保护防腐技术的研究[J].化学工程与装备,2014(1):21-22.
[8]尹依娜,唐祖友,惠小敏,等.塔河油田机采井腐蚀及防治[J].石油化工腐蚀与防护,2009,26(B05):77-79.
[9]赵良.高含硫气井高p H值环空牺牲阳极保护技术研究[D].东营:中国石油大学(华东),2011:36-40.