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A multiphysical-geochemical coupling model for caprock sealing efficiency in CO_(2) geosequestration

Deep Underground Science and Engineering 2023年第2期2卷 188-203页

作者： Jianguo Wang Huimin Wang Xiaolin Wang Shengqi Yang Hongtao Wu Chunfai Leung Jiali Tian School of Mechanics and Civil Engineering China University of Mining and TechnologyXuzhouChina State Key Laboratory for Geomechanics and Deep Underground Engineering China University of Mining and TechnologyXuzhouChina College of Water Conservancy and Hydropower Engineering Hohai UniversityNanjingChina School of Engineering University of TasmaniaHobartTasmaniaAustralia Center for Offshore Research and Engineering National University of SingaporeSingaporeSingapore

Precipitation or dissolution due to geochemical reactions has been observed in the caprocks for CO_(2) *** reactions modify the caprock sealing efficiency with self-limiting or ***,the effect of this modification on the caprock sealing efficiency has not been fully investigated through multiphysical-geochemical coupling *** this study,a multiphysical-geochemical coupling model was proposed to analyze caprock sealing *** coupling model considered the full couplings of caprock deformation,two-phase flow,CO_(2) concentration diffusion,geochemical reaction,and CO_(2) *** two-phase flow only occurs in the fracture network and the CO_(2) may partially dissolve into water and diffuse through the concentration *** dissolved CO_(2) has geochemical reactions with some critical minerals,thus altering flow *** CO_(2) in the fracture network diffuses into matrix,causing the matrix *** fully coupling model was validated with a penetration experiment on a cement cube and compared with two other models for CO_(2) storage ***,the effects of geochemical reactions on penetration depth and pore pressure were studied through parametric *** numerical simulations reveal that the coupling of geochemical reactions and matrix diffusion significantly affect the caprock sealing *** reactions occur at a short time after the arrival of CO_(2) concentration and modify the fracture *** CO_(2) diffusion into the matrix requires a much longer time and mainly induces matrix *** effects may produce selfenhancement or self-limiting depending on the flow rate in the fracture network,thus significantly modifying caprock sealing efficiency.

关键词： caprock sealing efficiency CO_(2)diffusion CO_(2)geosequestration geochemical reaction sorption strain

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A simple approach for the estimation of CO_2 penetration depth into a caprock layer

引用

Journal of Rock Mechanics and Geotechnical Engineering 2016年第1期8卷 75-86页

作者： J.G.Wang Yang Ju Feng Gao Jia Liu School of Mechanics and Civil Engineering China University of Mining and Technology State Key Laboratory for Geomechanics and Deep Underground Engineering China University of Mining and Technology State Key Laboratory of Coal Resources and Safe Mining China University of Mining and Technology

caprock is a water-saturated formation with a sufficient entry capillary pressure to prevent the upward migration of a buoyant fluid. When the entry capillary pressure of caprock is smaller than the pressure exerted by the buoyant CO2plume, CO2gradually penetrates into the caprock. The CO2penetration depth into a caprock layer can be used to measure the caprock sealing efficiency and becomes the key issue to the assessment of caprock sealing efficiency. On the other hand, our numerical simulations on a caprock layer have revealed that a square root law for time and pore pressure exists for the CO2penetration into the caprock layer. Based on this finding, this study proposes a simple approach to estimate the CO2penetration depth into a caprock layer. This simple approach is initially developed to consider the speed of CO2invading front. It explicitly expresses the penetration depth with pressuring time, pressure difference and pressure magnitude. This simple approach is then used to fit three sets of experimental data and good fittings are observed regardless of pressures, strengths of porous media, and pore fluids(water,hydrochloric acid, and carbonic acid). Finally, theoretical analyses are conducted to explore those factors affecting CO2penetration depth. The effects of capillary pressure, gas sorption induced swelling, and fluid property are then included in this simple approach. These results show that this simple approach can predict the penetration depth into a caprock layer with sufficient accuracy, even if complicated interactions in penetration process are not explicitly expressed in this simple formula.

关键词： Fracture-matrix system Fully coupled model Two-phase flow model Square root law Simple approach CO_2 penetration depth caprock sealing efficiency

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