A modeling strategy to investigate carbonated water injection for EOR and CO2 sequestration

Cleverson Esene,Sohrab Zendehboudi,Amer Aborig,Hodjat Shiri

doi:10.1016/j.fuel.2019.04.058

Cleverson Esene, Sohrab Zendehboudi + Show 2 more

https://doi.org/10.1016/j.fuel.2019.04.058

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Journal: Fuel	Publication Date: May 10, 2019
Citations: 31

Affiliation: Memorial University of Newfoundland

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Carbonated water injection (CWI) has been well investigated to improve oil recovery when compared to other enhanced oil recovery (EOR) techniques both in the secondary and tertiary modes. Extra oil recovery and CO2 sequestration associated with CWI have been studied through several experimental works. There are not adequate number of modelling studies about the CWI operation in the open sources because of the complex multi-physics involved with the fluid-fluid and fluid-rock interactions during CWI processes. Hence, further experimental and modelling investigations are needed to be conducted on CWI to systematically capture/comprehend the governing physics and complex displacement mechanisms. This research work will focus on the analysis of vital aspects such as oil recovery amount (and mechanisms), fluids distribution, and effects of operational parameters and well placement on the performance of CWI for both EOR and CO2 sequestration purposes. To achieve these objectives, a 3-D heterogenous reservoir model is developed using the experimental data reported in the recent literature. A new approach of using the grid local pressure to model CWI is adopted where the moles of CO2/water are controlled by their injection rates. The dissolution of CO2 in water is modeled by the Henry’s law for each subsequent grid local pressure. In this research, it is found that through CWI, an additional oil recovery can be achieved when compared to plain (conventional) waterflooding (WF) in the secondary recovery mode. A subsequent increase in the injection pressure leads to more dissolution of CO2 and enhancement of the overall performance of CWI. There is an optimum injector rate, which ensures an effective mass transfer across phases. An optimal well orientation will also give a better recovery performance during CWI. The amount of CO2 stored is also illustrated in this work as an additional benefit achieved in the CWI processes.

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