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
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。
CO2
H2S
腐蚀机理
腐蚀速率
腐蚀产物
casing
CO2
H2S
corrosion mechanism
corrosion rate
corrosion product
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.
中图分类号 TG172 DOI 10.11973/jxgccl202212009
所属栏目 试验研究
基金项目 陕西省自然科学基础研究计划项目(2022JM-269)
收稿日期 2021/7/23
修改稿日期 2022/7/12
网络出版日期
作者单位点击查看
备注朱广社(1973-),男,甘肃镇原人,高级工程师,博士研究生
引用该论文: 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 for mechancial engineering, 2022, 46(12): 55～59
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
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