Abstract
Abstract This paper presents non-isothermal effects on disposal of carbon dioxide into a saline aquifer. Carbon dioxide storage in the subsurface could be an important part of the present climate control initiative to reduce the carbon dioxide concentration of the atmosphere. Layer of water-bearing permeable rock is assumed as a saturated porous medium, and the contained water can be replaced by compressed carbon dioxide. In such environment, water vapor flow can be developed from the thermal gradient caused by geothermal energy. High injection pressure is required to remove the fluid already present in the pores of solid skeleton hence accurate density calculation is important. So we use an extended ideal gas law to calculate the compressed carbon dioxide gas density. Temperature dependent entry pressure is accounting the surface tension and wetting angle role on the sorption equilibrium. Governing equations for numerical simulations are: mass balance equations for each component, i.e., water, vapor and carbon dioxide; energy balance equation. We have used a combined monolithic and staggered coupling scheme to solve these equations numerically using an automatic time stepping scheme. The numerical model is implemented into an open source in-house scientific finite element code allowing for simulations of applications in various geotechnical areas.
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