The geological storage of carbon dioxide is a technology under development, being its main goal the gas sequestration in deep geological formations. CO2 is captured from industrial sites where fossil fuel combustion is used in the processes, transported by pipe line, ship or container truck to the storage sites, in order to be injected in the geological formations in a permanent trapping. Criteria for the design of efficient and safe CO2 injection strategy in fractured carbonates with low matrix permeability are discussed in this thesis. Information for the industrial process development and its monitoring to ensure safety is provided (National Patent nº 201500151) CO2 migration occurs mainly through the existing fracture networks and those ones induced by the effects of injection of several fluids in the reservoirs with low matrix porosity. These effects occur during the hydraulic characterization and operation, producing a high anisotropy level in the reservoir behavior. Moreover, for geological formations like carbonates, the mixture of carbon dioxide and brine chemically reacts with the rock in the reservoir producing relevant changes on injection parameters. The injection of brine and CO2 induces changes on geomechanical properties of fractures and in the composition of materials of their fillings. Permeability increases due to hydrodynamic effects produced by the injection and the geochemical reactivity among this mixture and the rock of the deep saline aquifer, producing a dynamic behavior of the reservoir which involves different operational conditions for each stage of the project life. The design, operation and monitoring of a CO2 injection strategy in conditions of transport by pipeline are discussed in the thesis, considering the results from the well drilling and logging tests, petrophysical laboratory works, hydraulic characterization campaigns and CO2 injections in real life conditions. The model refining and the development of new codes for interpreting the multiphase flow effects in the fractures and the associated chemical reactivity in the reservoir are analyzed as well. The criteria exposed have been established according to the results of experimental works conducted by the Ph.D student in the Technology Development Plant for CO2 Geological Storage located in Hontomín (Burgos), owned by Fundación Ciudad de la Energía (CIUDEN).
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