Year: 2013
Type: article
Abstract: Carbon dioxide (CO 2 ) has recently been considered as an alternative geothermal working fluid because of some favorable fluid dynamics and heat transfer properties compared to water.While the thermal and hydraulic aspects of CO 2 -based geothermal systems look promising, major uncertainties remain with regard to chemical interactions between fluids and rocks, particularly during the transition from resident water to supercritical CO 2 .We have performed reactive transport modeling to study fluid-rock interactions and its impact on porosity and permeability changes, based on batch experiments with rock and mineral samples and mixtures of water and CO 2 ; these experiments are conducted at temperature and pressure conditions that are representative of typical geothermal systems.Different thermodynamic databases are tested, and the geochemical model is calibrated by adjusting the reactive surface area, as a representative rate controlling parameter, to fit the experimental data of mineral dissolution.The flow and geological conditions of a CO 2 geological sequestration site at Cranfield, Mississippi are used for the modeling analyses.The objective of this research is to (1) investigate mineral dissolution and precipitation patterns, (2) evaluate associated porosity changes and effects on fluid and heat transfer, and (3) determine thermodynamic and kinetic reaction rate parameters that can be used to constrain coupled process models. DISCLAIMERThis document was prepared as an account of work sponsored by the United States Government.While this document is believed to contain correct information, neither the United States Government nor any agency thereof, nor The Regents of the University of California, nor any of their employees, makes any warranty, express or implied, or assumes any legal responsibility for the accuracy, completeness, or usefulness of any information,
Author: Jung, Y.
Institution: Lawrence Berkeley National Laboratory
Language: English
Subfield: Environmental Engineering
Field: Environmental Science
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W200915713