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| CO2盐水层埋存条件下Mg2+对油井水泥石腐蚀的影响 |
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步玉环1,2,吴广军1,2,郭辛阳1,2,郭胜来1,2
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(1.非常规油气开发教育部重点实验室(中国石油大学(华东)),山东青岛 266580;2.中国石油大学(华东)石油工程学院,山东青岛 266580)
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| 摘要: |
| 为探索CO2盐水层埋存条件下Mg2+对油井水泥石腐蚀的影响,采用X射线衍射(XRD)、热重分析(TGA)和背散射电子像(SEM-BSE)等分析方法对腐蚀后的水泥石进行分析。结果表明:Mg2+会减小CO2对水泥石的腐蚀速率;Mg2+存在的情况下,水泥石表层生成的菱镁矿会一定程度上减缓碳酸钙的溶解,水泥石表面淋滤作用并不明显,内部生成的水镁石、菱镁矿和膨胀性矿物碳酸钙造成水泥石内应力增大而产生多条裂隙;Mg2+存在的情况下,水泥石表层生成的菱镁矿及其内部生成的水镁石均会阻碍水泥石与外部腐蚀离子的反应,Mg2+对CO2腐蚀水泥石的过程具有“减缓效应”。 |
| 关键词: CO2埋存 盐水层 腐蚀 镁离子 减缓效应 |
| DOI：10.3969/j.issn.1673-5005.2020.02.009 |
| 分类号::TE 254.3 |
| 文献标识码:A |
| 基金项目:国家自然科学基金项目(51704325,51704321);教育部创新团队项目(IRT_14R58);中央高校基本科研业务费专项(18CX02103A) |
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| Effect of magnesium ion on corrosion of oil well cement stone under CO2 brine layer storage conditions |
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BU Yuhuan1,2, WU Guangjun1,2, GUO Xinyang1,2, GUO Shenglai1,2
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(1.Key Laboratory of Unconventional Oil ＆ Gas Development (China University of Petroleum (East China)), Ministry of Education, Qingdao 266580, China;2. School of Petroleum Engineering in China University of Petroleum (East China), Qingdao 266580, China)
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| Abstract: |
| In order to explore the influence of magnesium ion on the corrosion of oil well cement stone under CO2 brine layer storage conditions, XRD, TGA, and SEM-BSE were used to analyze the corroded cement stone. The results show the magnesium ion can reduce the corrosion rate of cement stone by CO2. In the presence of magnesium ions, magnesite formed on the surface of cement stone can slow down the dissolution of calcium carbonate to some extent, and the leaching effect on the surface stone of cement is not significant. The internally formed brucite, magnesite and the expanded mineral calcium carbonate increase the internal stress of the cement stone, creating multiple cracks. In the presence of magnesium ions, the magnesite formed on the surface of cement and the brucite formed inside will hinder the reaction of cement stone with external corrosion ions. And magnesium ions shows "mitigation effect" on the process of CO2 corrosion of cement stone. |
| Key words: carbon storage brine layer corrosion magnesium ion mitigation effect |
