engleski

Simulation study of CO2 retention during tertiary EORr flood in Ivanić oilfield

The outset of industrial age has been accompanied with a steady increase of atmospheric concentration of carbon dioxide (CO2) from anthropogenic sources, mainly from fossil fuel combustion within energy sector, as well as from other industrial activities. Ever since the adverse effect of the process on climate change (i.e. global warming) has been recognized, many governmental and industry initiatives are aimed at supporting and funding the research of various strategies for reduction of CO2 emissions and amounts in the atmosphere. A major consideration is given to geological sequestration: capture of CO2 followed by injection and permanent storage in underground geological formations like aquifers, coal mines and depleted hydrocarbon reservoirs. Enhanced oil recovery (EOR) by CO2 injection is an attractive sequestration option, since (1) the process has been commercially used since 1970s and its features are well known, (2) a part of CO2 sequestration costs in this case is offset by the value of additional oil produced. According to the published screening criteria, 1 more than 80% of oil reservoirs worldwide are candidates for the implementation of CO2 EOR process, while approximately 20000 tons/day of CO2 are currently used for EOR projects.2 The major part of the CO2 presently used comes from natural underground accumulations and engineering objective is to minimize utilization ratio of CO2 (amount per m3 of oil recovered). In (future) use of anthropogenic CO2 captured at point sources, the sequestration issue changes the approach to CO2 project design, since the objective is to increase retention of CO2 while maintaining acceptable level of additional oil recovery. This paper compares the results of simulation runs which were part of the original reservoir study aimed at investigating the incremental oil recovery due to CO2 flooding to the results of subsequent runs designed to increase CO2 retention during the flooding.

carbon dioxide; retention; simulation; tertiary; EOR

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