Coal II
R&D Project – Evaluation of the carbon sequestration potential in coal deposits in southern Brazil.
Sponsor:
Petrobras
Period of execution
2007
Project presentation:
Evaluation of the potential for geological storage of CO2 in coal seams in southern Brazil for the purpose of mitigating climate change. The assessment of the potential for methane to be produced as a result of CO2 storage in coal seams was carried out from the characterization of these layers from the point of view of their chemical, physical, geochemical composition, lateral continuity. A correlation was also made between the coal seams on the north coast of Rio Grande do Sul and the south of Santa Catarina, for the purpose of calculating the potential for carbon sequestration in coal deposits in southern Brazil and greater precision in the delimitation of coal basins.
From the sounding of two wells, the validation of the following bench studies carried out at CEPAC and in the DOE/NETL laboratory was carried out: i) permeability, ii) porosity, iii) maceralic composition, iv) adsorption isotherms, v) test injectivity for sampling methane contained in coal layers, vi) characterization of seal rocks and vii) gas flow;
Estimates of the theoretical and field potential were carried out in relation to methane contained in coal seams at the Charqueadas mine;
Studies of the potential for the application of CCS technology associated with advanced methane recovery through the injection of CO2 into coal seams (Enhanced Coalbed Methane Recovery – ECBM);
Studies of changes in the physical structure of coal when CO2 is injected and CH4 is produced (matrix swelling or shrinkage).
