H2S-CO2 mixture corrosion-resistant Fe2O3-amended wellbore cement for sour gas storage and production wells

The cement sheath used in H2S-CO2 mixture gas storage and high-temperature and high-pressure (HTHP) production wells is easily corroded; thus the cement has strict requirements for corrosion-resistant properties. In this work, a new additive, HTHP-CRA, was used to improve corrosion-resistant propert...

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Bibliographic Details
Published inConstruction & building materials Vol. 188; pp. 161 - 169
Main Authors Xu, Bihua, Yuan, Bin, Wang, Yongqing, Zhu, Liang
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 10.11.2018
Subjects
CO2
Gibbs free energy
H2S
Mixtures corrosion
Oil well cement
H2S
Mixtures corrosion
Gibbs free energy
Oil well cement
CO2
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Summary:The cement sheath used in H2S-CO2 mixture gas storage and high-temperature and high-pressure (HTHP) production wells is easily corroded; thus the cement has strict requirements for corrosion-resistant properties. In this work, a new additive, HTHP-CRA, was used to improve corrosion-resistant properties of Fe2O3-amended cement by reducing the original permeability and the generation low-Ca/Si hydration products. The experimental results indicate that the addition of HTHP-CRA to cement can slightly increase the original compressive strength, significantly reduce the original permeability and CH. The additive can also react with high-Ca/Si hydration products to generate low-Ca/Si hydration products such as xonotlite and tobermorite. Moreover, the addition of HTHP-CRA remarkably weakens leaching and corrosion effects by reduce CH during the corrosion process.
ISSN:0950-0618
1879-0526
DOI:10.1016/j.conbuildmat.2018.08.120