Jidong Wang, Tengfei Yin, Wenlong Qi, Xuanpeng Li, Yang Zhao, Tao Zhang, Fuhui Wang
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引用次数: 0
摘要
研究了 HP-13Cr 不锈钢（HP-13Cr SS）在甲酸盐环形保护液中的腐蚀和被动行为。HP-13Cr SS 在清洁的甲酸盐环状保护液中表现出良好的被动行为，这归因于主要由 Cr2O3 组成的更薄更致密的被动膜。在地层水溶液中，被动膜由逸散的 Cr(OH)3 组成，这可以用等电点理论来解释，从而导致 HP-13Cr SS 的被动行为变差。当地层水渗透到甲酸盐环形保护液中时，腐蚀鳞片中形成了大量疏松的 FeCO3 颗粒，因此 HP-13Cr SS 遭到了严重腐蚀。因此，避免地层水渗入甲酸环保护液有利于提高 HP-13Cr SS 油管在极腐蚀环境中的使用寿命。
Investigation of the Corrosion and Passive Behavior of HP-13Cr Stainless Steel in Formate Annulus Protection Fluid
The corrosion and passive behavior of HP-13Cr stainless steel (HP-13Cr SS) in formate annulus protection fluid was investigated. HP-13Cr SS exhibited good passive behavior in clean formate annulus protection fluid, which was attributed to a thinner and more dense passive film mainly composed of Cr2O3. In the formation water solution, the passive film was composed of metastable Cr(OH)3, which was explained by the isoelectric point theory, resulting in the deterioration of the passive behavior of HP-13Cr SS. When the formation water penetrated the formate annulus protection fluid, a large number of loose FeCO3 particles formed in the corrosion scales, thus HP-13Cr SS suffered severe corrosion. Therefore, avoiding formation water penetrating the formate annulus protection fluid is conducive to improving the service life of HP-13Cr SS oil tubes in extremely aggressive environment.
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