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    朱广社, 张晓博, 杨学峰, 刘洋, 张立原, 赵春雨, 游家庆, 江丰, 刘曼, 刘思佳. 长庆油田含硫化氢区块中J55钢套管的腐蚀机理[J]. 机械工程材料, 2022, 46(12): 55-59. DOI: 10.11973/jxgccl202212009
    引用本文: 朱广社, 张晓博, 杨学峰, 刘洋, 张立原, 赵春雨, 游家庆, 江丰, 刘曼, 刘思佳. 长庆油田含硫化氢区块中J55钢套管的腐蚀机理[J]. 机械工程材料, 2022, 46(12): 55-59. DOI: 10.11973/jxgccl202212009
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    ZHU Guangshe, ZHANG Xiaobo, YANG Xuefeng, LIU Yang, ZHANG Liyuan, ZHAO Chunyu, YOU Jiaqing, JIANG Feng, LIU Man, LIU Sijia. Corrosion Mechanism of J55 Steel Casing in Block ContainingHydrogen Sulfide in Changqing Oilfield[J]. Materials and Mechanical Engineering, 2022, 46(12): 55-59. DOI: 10.11973/jxgccl202212009
    Citation: ZHU Guangshe, ZHANG Xiaobo, YANG Xuefeng, LIU Yang, ZHANG Liyuan, ZHAO Chunyu, YOU Jiaqing, JIANG Feng, LIU Man, LIU Sijia. Corrosion Mechanism of J55 Steel Casing in Block ContainingHydrogen Sulfide in Changqing Oilfield[J]. Materials and Mechanical Engineering, 2022, 46(12): 55-59. DOI: 10.11973/jxgccl202212009
    shu

    长庆油田含硫化氢区块中J55钢套管的腐蚀机理

    Corrosion Mechanism of J55 Steel Casing in Block ContainingHydrogen Sulfide in Changqing Oilfield

      摘要
    • 摘要: 采用能谱分析仪、扫描电子显微镜、X射线衍射仪等对长庆油田含硫化氢区块中J55钢套管表面的腐蚀产物,及不同腐蚀环境(纯CO2、纯H2S、不同分压CO2+H2S环境)中J55钢试样表面腐蚀产物的组成及形貌进行了分析,计算了腐蚀速率,并研究了含硫化氢区块J55钢套管的腐蚀机理。结果表明:J55钢在纯CO2环境中会形成粗粒径且致密性较差的FeCO3腐蚀产物膜,其腐蚀速率较高;H2S的加入使得J55钢在CO2+H2S环境中形成了细粒径致密性高的FeS腐蚀产物膜,对基体金属能起到一定的保护作用,从而显著降低了腐蚀速率;J55钢在长庆油田含硫区块的腐蚀机理为以H2S腐蚀占主导的CO2+H2S腐蚀。

       

      Abstract: The corrosion product composition and morphology on the surface of J55 steel casing in H2S containing block in Changqing Oilfield and in different corrosive enviroments (pure CO2, pure H2S, different partial pressure CO2+H2S enviroments) were analyzed by energy spectrum analyzer, scanning electron microscope and X-ray diffractometer. The corrosion rate was calculated, and the corrosion mechanism of J55 steel casing in H2S containing block was studied. The results show that the coarse-grained FeCO3 corrosion product film with low compactness was formed in a single CO2 environment for J55 steel, whose corrosion rate was high. The addition of H2S made J55 steel form a fine-grained and dense FeS corrosion product film in CO2+H2S environments, which could protect the base metal and significantly reduce the corrosion rate of J55 steel. The corrosion mechanism of J55 steel in sulfur-containing block of Changqing Oilfield was CO2+H2S corrosion dominated by H2S corrosion.

       

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