Carbon-Negative Scenarios in High CO 2 Gas Condensate Reservoirs

Lucija Jukić, Domagoj Vulin, Valentina Kružić and Maja Arnaut
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Lucija Jukić: Faculty of Mining, Geology and Petroleum Engineering, University of Zagreb, Pierottijeva 6, 10000 Zagreb, Croatia
Domagoj Vulin: Faculty of Mining, Geology and Petroleum Engineering, University of Zagreb, Pierottijeva 6, 10000 Zagreb, Croatia
Valentina Kružić: Faculty of Mining, Geology and Petroleum Engineering, University of Zagreb, Pierottijeva 6, 10000 Zagreb, Croatia
Maja Arnaut: Faculty of Mining, Geology and Petroleum Engineering, University of Zagreb, Pierottijeva 6, 10000 Zagreb, Croatia

Energies, 2021, vol. 14, issue 18, 1-11

Abstract: A gas condensate reservoir in Northern Croatia was used as an example of a CO 2 injection site during natural gas production to test whether the entire process is carbon-negative. To confirm this hypothesis, all three elements of the CO 2 life cycle were included: (1) CO 2 emitted by combustion of the produced gas from the start of production from the respective field, (2) CO 2 that is separated at natural gas processing plant, i.e., the CO 2 that was present in the original reservoir gas composition, and (3) the injected CO 2 volumes. The selected reservoir is typical of gas-condensate reservoirs in Northern Croatia (and more generally in Drava Basin), as it contains about 50% CO 2 (mole). Reservoir simulations of history-matched model showed base case (production without injection) and several cases of CO 2 enhanced gas recovery, but with a focus on CO 2 storage rather than maximizing hydrocarbon gas production achieved by converting a production well to a CO 2 injection well. General findings are that even in gas reservoirs with such extreme initial CO 2 content, gas production with CO 2 injection can be carbon-negative. In almost all simulated CO 2 injection scenarios, the process is carbon-negative from the time of CO 2 injection, and in scenarios where CO 2 injection begins earlier, it is carbon-negative from the start of gas production, which opens up the possibility of cost-effective storage of CO 2 while producing natural gas with net negative CO 2 emissions.

Keywords: gas-condensate; enhanced gas recovery; CO 2 storage; CO 2 capture utilization and storage; reservoir simulation; carbon-negative (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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