Technical reports

Technical report “CEEGS Deliverable 2.1: Geological scenarios and their characteristics” dated 28 April 2023

In this WP2 deliverable, possible geological scenarios and the limitations they impose to the CEEGS concept are addressed. Analytical solutions are used to study the key issues of initial plume setp in a porous media and the reservoir depth restrictions imposed by pressure losses in wellbores. The same analytical solutions, using a Monte Carlo approach, allow to study the sensitivity of the P-T conditions expected at the CO2 injection and back-production wells. The scenarios considered cover porous media (deep saline aquifers or depleted hydrocarbon fields and salt cavities) with different configurations and characterised by ranges of hydraulic and thermodynamic conditions. Authors: Júlio Carneiro, Converge!, Lda Dounya Behnous, Converge!, Lda

Download, 45 pages, in English


Technical report “CEEGS Deliverable 2.2: Assessment of the impact of geological conditions on the efficieny of the system” dated December 2023

Numerical and semi-analytical simulations are conducted to understand how the transient behaviour of P and T in boreholes and geological reservoirs during the charge/discharge cycles affect the overall efficiency of the system. Tested geological scenarios include Deep Saline Aquifers, Geothermal reservoirs, and Salt dissolution cavities, in multiple configurations. The porous media scenarios (wellbores and reservoirs) are modelled numerically using the software CMG and the impact of the geological conditions to the CEEGS feasibility is assessed through well indexes, such as injectivity and productivity, and through gross efficiency, while a sensitivity analysis defines the relative importance of different reservoir parameters. The salt cavities scenarios are studied using a semi-analytical approach that integrates salt cavity, wellbores and surface facilities to obtain the efficiency of the system for different cavity depths. Authors: Dounya Behnous /Converge!, Lda/, Márton Farkas /GFZ Potsdam/ , Andrés Carro /University of Seville/, Ricardo Chacartegui /University of Seville/, Júlio Carneiro /Converge!, Lda/

Download, 40 pages, in English


Technical report “CEEGS Deliverable 3.1: CEEGS Cycle, Relevant System Characterisation” dated 31 October 2023

This report shows the main results of task 3.1 in the first 12 months of execution. It defines the main parameters and components integration within the base designs of the CEEGS project system. Two power scales, 5 MW and 100 MW, are considered for the analyses and designs. The deliverable defines the reference layouts and the main parameters of the cycle. The task 3.1 has evolved satisfactorily, and relevant results regarding the layouts’ definitions and parameters have been obtained. They will allow advancing in the next steps within task 3.1 and the related tasks in WP3 and WP4. No delays or deviations are identified regarding the planned activities. Authors: Andres Carro, University of Seville Ricardo Chacartegui, University of Seville

Download, 54 pages, in English