Design of a two-well field test to determine in situ residual and dissolution trapping of CO₂ applied to the Heletz CO₂ injection site

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• 作者：Fritjof Fagerlund ; Auli Niemi ; Jacob Bensabat ; Vladimir Shtivelman
• 关键词：CO2 ; Geological storage ; Dissolution ; Residual trapping ; Field experiment
• 刊名：International Journal of Greenhouse Gas Control
• 出版年：November, 2013
• 年：2013
• 卷：19
• 期：Complete
• 页码：642-651
• 全文大小：2631 K

文摘

Field testing is a critical step to improve our knowledge on in situ-trapping mechanisms of CO₂ injected in geological formations and their relative importance. In this study, we present a two-well test sequence aimed at quantifying field values of both residual and dissolution trapping of CO₂. Then, we apply it to the Heletz experimental CO₂ injection site, using numerical modelling. The sequence includes a hydraulic test to measure residual scCO₂ saturation and a novel tracer technique, together with measurements of abstracted fluid compositions for quantification of the rate of CO₂ dissolution in the reservoir. The proposed tracer technique uses a tracer with negligible aqueous solubility, which is injected with the scCO₂ and enriched in the scCO₂ phase as CO₂ dissolves. We show that this tracer can provide direct information about the dissolution of mobile scCO₂. We also show that the rate of abstracted dissolved CO₂ can be used to predict the total rate of CO₂ dissolution, provided that the amount of dissolved CO₂ in the formation stabilizes, and that this can be achieved with the proposed abstraction scheme. We conclude that the combination of these measurements is a promising tool for detailed field-scale characterization of residual and dissolution trapping processes.