目前在二氧化碳地質封存技術的各項環節中，套管水泥因為碳酸化反應而產生的性質弱化亦為其中一主要問題。與封存的二氧化碳產生碳酸化反應的水泥，會因組成物質及結構的改變而產生力學及物理性質的弱化，進而影響封存井的使用年限。前人研究雖指出在水泥中加入二氧化矽可降低長期反應速率，但仍無法有效地解決整體反應速率較高及反應深度偏深的問題。
本研究以結合二氧化矽掺料之優點及修正其缺點為目的，選用五種不同矽酸化合物作為掺料並模擬水泥與井底封存環境(70˚C、20MPa、超臨界二氧化碳溶於地層水)，觀察其經過不同時間(0、7、14、28天)的反應後性質的改變。研究結果發現添加掺料之水泥之反應層皆較純API G水泥薄，而本研究所使用之固體類掺料更具有提升水泥力學性質之效果。綜合所有試驗結果，以添加矽酸鈣及矽酸鉀者之整體結果較佳。

Degradation of well cement caused by carbonation reaction is one of the main problems in carbon dioxide (CO2) geological sequestration. Carbonated cement has weaker mechanical strength than pure cement and reduces durability of sequestrating well. Researches indicate that addition of silica dioxide (SiO2) in well cement can reduce its long-term carbonation rate, but its overall carbonation rate is relatively higher than pure well cement. Therefore, the main purposes of this paper are applying the advantages of SiO2 and modifying its disadvantages as well cement admixtures. According to researches before, there are applications of five different kinds of silicates used (calcium silicate, aluminum trisilicate, potassium silicate, sodium silicate and ethyl silicate) as well cement admixtures in this paper. This paper intends to evaluate alterations of modified API G well cement with different silicate admixtures in the simulating environment under supercritical CO2 in down-hole sequestration condition (70˚C, 20MPa, supercritical CO2 with brine) and the alterations of properties were studied in four periods (0, 7, 14, 28 days) of carbonation duration. This study indicates that the API G cement with silicate admixtures has lower carbonation depth than pure API G cement and additions of calcium silicate, aluminum trisilicate and potassium silicate can enhance mechanical properties of API G cement. The results in this paper indicate that API G cement with calcium silicate and potassium silicate are better choices for well cement in application of CO2 geological sequestration.

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