Laboratory-scale Interaction Between CO₂-saturated H₂SO₄-rich Brine and Reservoir Rocks (Limestone and Sandstone)

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• 作者：Eike M. Thaysen^a ; ^b ; ^{eike.thaysen@idaea.csic.es} ; Josep M. Soler^a ; ^b ; Jordi Cama^a ; ^b
• 关键词：CO2 storage ; impurities ; SO2-and-CO2-water-rock interactions ; percolation experiments ; reactive transport modeling
• 刊名：Procedia Earth and Planetary Science
• 出版年：2017
• 出版时间：2017
• 年：2017
• 卷：17
• 期：Complete
• 页码：614-617
• 全文大小：302 K
• 卷排序：17

文摘

We investigated the effect of 0.36% SO2 in the CO2 injection stream (added as dissolved H2SO4) on the reactivity of the reservoir (limestone and sandstone) rocks of Hontomin (Spain) at P = pCO2 = 10 bar and 60 °C using flow-through column experiments. Results were modeled with the CrunchFlow reactive transport code. A comparison between the reactivity of the rocks reacted in H2SO4-free and H2SO4-rich brine showed that calcite dissolution and gypsum precipitation were elevated by 27-42% and 63-75%, respectively, in the H2SO4-rich brine. Overall rock porosity increases in H2SO4-rich brine were 7-19% higher than under H2SO4-free conditions. Porosity increases in the acid inlet zone in H2SO4-rich brine were similar to increases in H2SO4-free brine for sandstone. In limestone, porosity increases in the acid inlet zone in H2SO4-free brine were further elevated by 70% in H2SO4-rich brine.