Simulation Study of CO 2 Huff-n-Puff in Tight Oil Reservoirs Considering Molecular Diffusion and Adsorption

Yuan Zhang, Jinghong Hu and Qi Zhang
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Yuan Zhang: School of Energy Resources, China University of Geosciences (Beijing), Beijing 100083, China
Jinghong Hu: School of Energy Resources, China University of Geosciences (Beijing), Beijing 100083, China
Qi Zhang: School of Information Technology and Management, University of International Business and Economics, Beijing 100029, China

Energies, 2019, vol. 12, issue 11, 1-15

Abstract: CO 2 injection has great potentials to improve the oil production for the fractured tight oil reservoirs. However, Current works mainly focus on its operation processes; full examination of CO 2 molecular diffusion and adsorption was still limited in the petroleum industry. To fill this gap, we proposed an efficient method to accurately and comprehensively evaluate the efficiency of CO 2 -EOR process. We first calculated the confined fluid properties with the nanopore effects. Subsequently, a reservoir simulation model was built based on the experiment test of the Eagle Ford core sample. History matching was performed for the model validation. After that, we examined the effects of adsorption and molecular diffusion on the multi-well production with CO 2 injection. Results illustrate that in the CO 2 -EOR process, the molecular diffusion has a positive impact on the oil production, while adsorption negatively impacts the well production, indicating that the mechanisms should be reasonably incorporated in the simulation analysis. Additionally, simulation results show that the mechanisms of molecular diffusion and adsorption make great contributions to the capacity of CO 2 storage in tight formations. This study provides a strong basis to reasonably forecast the long-term production during CO 2 Huff-n-Puff process.

Keywords: molecular diffusion; adsorption; nano-porous confinement; CO 2 Huff-n-Puff; tight oil reservoir (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: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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