Study of CO₂ storage in oil reservoirs and aquifers
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- Master i teknologi 
Carbon dioxide storage in oil reservoirs and aquifers is one of the most promising research fields regarding reduction of climate gas emissions. Changing of CO₂ physical properties with temperature and pressure in deep aquifers allows a great storage potential, especially in reservoir formations with high porosity and secure cap rock such as in Utsira Formation. Geological monitoring of this reservoir uncovered a theoretical potential storage capacity for about 600 Mt of CO₂ by producing formation water from the reservoir. Production of formation water followed by extraction of already injected CO₂ in reservoir may cause great economical disadvantages and weaken the storage process. This work studies the results of simulation cases where inflow control devices, ICD and AICV valves, modeled in different arrangements and permeability zones along the wellbore, may offer a better alternative to minimize and maybe avoid CO₂ extraction from the reservoir. A potential advantage of using these valves in order to increase water production and decrease gas extraction is evaluated from an economic point of view. Replacing the accumulated water from the reservoir, without significant amount of bi-produced CO₂, could assure a great potential of CO₂ storage. The exploiting time of these valve arrangements is a very important. The gas breakthrough increases production costs at the surface because of the separation and reinjection of extracted CO₂. This may require further experiments with different valve allocations in permeability zones and with different functional configurations.