钛合金油管在苛刻井下环境中的抗腐蚀性能研究

发布时间：2018-01-11 03:08

  本文关键词：钛合金油管在苛刻井下环境中的抗腐蚀性能研究　出处：《热加工工艺》2017年06期 　论文类型：期刊论文

  更多相关文章： TC钛合金 地层水 完井液 CO腐蚀 四点弯曲试验 应力腐蚀开裂

【摘要】：通过失重腐蚀试验和应力腐蚀开裂(四点弯曲法)试验,研究了TC4钛合金在地层水和完井液环境中抗均匀腐蚀、局部腐蚀和SCC性能。结果表明:在地层水CO_2腐蚀环境中,TC4钛合金为轻微腐蚀,温度升高,均匀腐蚀速率变化不大,温度达到220℃时,均匀腐蚀速率仅为0.0012 mm/a,且试样表面无局部腐蚀,表明该合金具有良好的抗地层水CO_2均匀腐蚀和局部腐蚀性能;在完井液CO_2腐蚀环境中,TC4钛合金的均匀腐蚀速率高达0.4247 mm/a,该合金发生明显的点蚀和选择性溶解腐蚀;在地层水CO_2腐蚀和完井液CO_2腐蚀环境中SCC试验均未发现裂纹,具有良好的抗SCC性能。
[Abstract]:The resistance of TC4 titanium alloy to uniform corrosion in formation water and completion fluid was studied through weightlessness corrosion test and stress corrosion cracking (Four-point bending method) test. Local corrosion and SCC properties. The results show that the TC4 titanium alloy is slightly corroded in the formation water CO_2 corrosion environment, the temperature increases, the uniform corrosion rate changes little, and the temperature reaches 220 鈩，

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