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Effect of Acid Corrosion on the Stress Sensitivity of Carbonate-Cemented Sandstone during CO2 Geological Storage
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DOI：10.1021/acs.energyfuels.5c05143.png)
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Abstract
En 中文
Carbon dioxide (CO2) geological storage is a practical strategy to control greenhouse gas emissions and mitigate climate change. The reservoir fluid becomes acidic after CO2 injection, which corrodes the reservoir rock and affects the stress sensitivity of the reservoir rocks. This study systematically analyzed the impact of acid corrosion on the stress sensitivity of carbonate-cemented sandstone. The stress sensitivity tests of carbonate-cemented sandstone after acid corrosion with different cementation contents, different pH values, and different flow rates were carried out. The variation of porosity and permeability of carbonate-cemented sandstone with stress was analyzed, and it was found that the permeability–stress and porosity–stress evolution of carbonate-cemented sandstone showed a similar trend: within the low effective stress range, both permeability and porosity decreased rapidly in a nonlinear manner. As the effective stress increased, the permeability and porosity decreased linearly in the high effective stress range. Subsequently, the primary factors influencing the acid corrosion stress sensitivity of carbonate-cemented sandstone were identified. The variation law of acid corrosion stress sensitivity of carbonate-cemented sandstone was studied, revealing that the stress sensitivity grade evolved from “weak” to “medium” and finally to “medium-to-strong” during the process of acid corrosion. Finally, a porosity–stress prediction model was established, enabling the accurate prediction of the porosity–stress evolution of carbonate-cemented sandstone. This research provides valuable guidance for CO2 geological storage in carbonate-cemented sandstone reservoirs.
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