Hybrid Subsea CCS System-CO2 Storage in Offshore Ultra Deep-Water Salt Caverns

Iris Publishers-Current Trends in Civil & Structural Engineering

Computational geomechanics is the field of computational mechanics where geo-engineering systems are analyzed using the prinCurrently there is a demand for CCS of large quantities of CO2 associated with CH4 in the pre-salt offshore oil fields in Brazil. The pre-salt reservoirs have as caprock 2000 meters of continuous rock salt. Rock salt is a special geomaterial. It has negligible permeability and porosity, is able to support very high stresses, develops the self-healing effect, fractures will heal only with time and a good geomechanical project can design very large openings in the salt body. In Brazil the rock mechanics and computing modeling related to underground excavations in salt rock started in the years 1970 ́s with very complex challenges, starting with the project of an underground mining of sylvinite (potash ore) overlying tachyhydrite, a very weak salt rock, solving the challenges of the solution mining of salt caverns, for brine production, in bedded stratified halite with intercalations of shales, development of special geomechanical projects of oil wells for drilling through very thick stratified salt rock barrier and finally the application of salt caverns opened by solution mining for natural gas storage and CCS of CO2.


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