Preparation and Evaluation of an H2S Corrosion Inhibitor for ZnFe-LDHs Oil Well Cement
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摘要: 我国高酸性油气田资源丰富，但在开发过程中固井水泥石将长期受到H2S等酸性介质的侵蚀，严重威胁到油气井的施工和安全生产。针对此问题，采用水热共沉淀法制备了ZnFe-LDHs型H2S防腐剂，并将掺有优选出的ZnFe-LDHs的水泥石置于5%浓度的Na2S溶液中分别在常温及60 ℃下浸泡1、3、7、14、28 d，通过抗压强度测试、XRD、SEM等表征手段，分析ZnFe-LDHs对水泥石的防H2S腐蚀能力和作用机理。结果表明，晶化温度为90 ℃下制备的Zn/Fe物质的量的比为（1～4）∶1的ZnFe-LDHs性能较好，均可提高水泥石的抗压强度，且强度随着Zn/Fe物质的量的比增加而增大，即掺加了Zn/Fe物质的量的比为4∶1的ZnFe-LDHs水泥石的作用效果最为明显，其强度增长了10.11%，而经Na2S溶液浸泡后，其早期强度降低，浸泡7 d时其强度相比于浸泡前在常温及60 ℃下分别增长了8.73%、4.96%，7 d后强度基本趋于稳定，这是由于ZnFe-LDHs能促进水化反应，并在浸泡后期与Na2S反应生成ZnS，提高水泥石的致密性，从而有效防止H2S对水泥石的腐蚀。Abstract: In developing the highly acidic oil and gas resources which are abundant in China, the set cement in the wellbore will long endure the erosion of the acid media such as H2S, and the this seriously threatens the safe operation and production of the oil and gas wells. To deal with this problem, a ZnFe-LDHs type corrosion inhibitor against the corrosion by the H2S is developed through hydrothermal coprecipitation method. Set cement samples containing the selected ZnFe-LDHs are soaked in 5% Na2S solution at room temperature and 60 ℃ for 1 d, 3 d, 7 d, 14 d and 28 d, respectively. The ability of ZnFe-LDHs to resist H2S corrosion and the mechanisms of this resistance are then studied through compressive strength measurement, XRD and SEM. The study shows that the ZnFe-LDHs made at crystallization of 90 ℃ and Zn/Fe molar ratio of (1–4):1 has satisfactory corrosion control performance; it increases the compressive strength of the set cement and the compressive strength of the set cement increases with increase in the molar ratio of Zn/Fe, that is, the ZnFe-LDHs with Zn/Fe molar ratio of 4:1 has the best effect on the compressive strength of the set cement; the compressive strength of the set cement is increased by 10.11%. When the set cement sample are soaked in Na2S solution, the early strength of the set cement decreases. After soaking for 7 d, the compressive strength of the set cement soaked at room temperature and at 60 ℃ is increased by 8.73% and 4.96%, respectively. When the soaking time is longer than 7 d, the compressive strength of the set cement becomes stable, the reason for this is that ZnFe-LDHs is able to promote hydration reaction, and in the later stage of the soaking, ZnFe-LDHs react with Na2S to produce ZnS, thereby increasing the density of the set cement and preventing the corrosion of H2S to the set cement.
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Key words:
- ZnFe-LDHs /
- Oil well cement /
- Corrosion inhibitor /
- H2S
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表 1 G级油井水泥化学成分及其质量分数
化学
成分质量分
数/%化学
成分质量分
数/%化学
成分质量分
数/%SiO2 22.74 MgO 1.95 K2O 0.45 Al2O3 2.62 CaO 61.79 烧失量 2.61 Na2O 0.23 Fe2O3 4.15 其他 5.07 
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表 2 不同反应条件下ZnFe-LDHs的平均比表面积
Zn/Fe物质的量的比 不同温度（℃）下ZnFe-LDHs的
平均比表面积/（m2/g）60 70 80 90 1∶1 0.181 0.551 0.345 0.629 2∶1 0.335 0.617 0.392 0.630 3∶1 0.109 0.157 0.178 0.851 4∶1 0.164 0.368 0.186 0.994
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