Study on Corrosion Rate of Cement Monomineralic C2S in CO2 Geological Sequestration Environment
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摘要: 在CO2地质封存和利用过程中，固井水泥容易与井下的酸性介质CO2发生碳酸化反应，腐蚀固井水泥石造成水泥石力学性能大幅度衰退。针对水泥石单矿C2S在CO2地质封存和利用环境中腐蚀反应速率不清晰的问题，通过SEM、XRD以及TG的测试方法，定量分析C2S腐蚀产物的变化规律。根据腐蚀产物CaCO3的摩尔生成率和非稳态扩散渗透模型拟合得到腐蚀反应产物CaCO3的生成系数α。SEM实验结果表明，腐蚀反应后C2S水泥单矿颗粒的表面均有较大改变，生成了部分腐蚀产物CaCO3；XRD结果表明，单矿C2S腐蚀产物CaCO3的晶型主要有方解石和文石；TG测试结果表明，C2S水泥单矿随着腐蚀龄期的增加，腐蚀产物的量均明显增加。拟合结果表明，C2S腐蚀产物生成速率随着温度的升高而增大，90 ℃下CaCO3腐蚀产物的生成速率系数α最大为54.90。Abstract: In geological sequestration and application of CO2, the cement used in well cementing is easy to react with CO2, an acidic gas produced downhole, causing the set cement for well cementing to be corroded and the mechanical properties of the set cement decline remarkably. Presently, the corrosion rate of the set cement monomineralic C2S in CO2 geological sequestration and application environment is still not clearly understood. In this study, several measuring methods, such as SEM, XRD and TG etc., are used to quantitatively analyze the changes of the corrosion products of C2S. The yield coefficient α of the corrosion product CaCO3 can be obtained by fitting the molar yield rate of the corrosion product CaCO3 with the non-steady state diffusion permeation model. The SEM experimental results show that after the corrosion reaction, the surfaces of the C2S cement monomineralic particles have undergone great changes, producing part of the corrosion product CaCO3; The XRD experimental results show that crystal forms of the corrosion product CaCO3 of the monomineralic C2S are mainly calcite and aragonite. The TG experimental results show that the amount of the corrosion products increases with the corrosion time of the C2S cement monomineral. The fitting results indicate that the yield rate of the corrosion products of C2S increases with temperature, at 90 ℃ the yield rate of the corrosion product CaCO3 has a maximum yield coefficient α of 54.90.
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Key words:
- C2S /
- CO2 storage and utilization /
- Phase quantification /
- CO2 corrosion reaction rate
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表 1 C2S试样在不同温度和龄期下CaCO3的摩尔生成率
腐蚀龄期/d 腐蚀温度/ ℃ $ \bar {P} $/（mol/d） 1 30 21.91 60 34.37 90 45.93 3 30 7.66 60 16.79 90 16.60 7 30 4.41 60 7.30 90 7.87 14 30 3.54 60 4.42 90 3.94 28 30 2.03 60 2.11 90 2.10 
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表 2 水泥单矿C2S腐蚀产物CaCO3的摩尔生成率拟合结果
样品 腐蚀温度/ ℃ α $ \beta $ R2 C2S 30 24.40 −3.859 0.955 60 40.59 −6.580 0.995 90 54.90 −11.190 0.976
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