首页|Coupled optimization of carbon dioxide sequestration and CO2 enhanced oil recovery
Coupled optimization of carbon dioxide sequestration and CO2 enhanced oil recovery
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NSTL
GO2 injection into hydrocarbon reservoirs can simultaneously pave the path for two important processes,namely oil production increase,and CO2 storage.This combined optimization problem can be referred to as carbon capture and storage-enhanced oil recovery(CCS-EOR)problem.CCS-EOR is a challenging task with many opportunities which should be studied in a timely manner.Moreover,the attitude of the management team towards prioritizing CCS or EOR should be considered.Therefore,in the current study,CCS-EOR problem was addressed by utilizing the dynamic well flow settings(bottom-hole pressure and/or flow rate)as the optimization variables with a weighted objective function.This approach was tested on a case study.Its huge simulation time due to high dimensionality remained a serious challenge.One effective approach was to use the underlying applied knowledge of the system and extract that wisdom to reduce the simulation time in a rational manner.CO2 breakthrough time was such a knowledge.Therefore,the importance of CO2 breakthrough time was stressed,and the understanding of the response of the simulator to this event was used to considerably reduce the simulation time in a black box approach.Moreover,a concise sensitivity analysis was performed which helped to schedule the workflow based on the given priority to each process.The optimized case could improve the objective value and gas storage efficiency up to 2.86 % and 12.1 % respectively.The obtained results can be used to analyze a variety of operational matters such as the CO2 distribution map in the reservoir,and the well settings.
CO2 sequestrationGas storage efficiencyEnhanced oil recoveryOptimizationCompositional simulation
NSTL
