Numerical Simulation on Pore Size Multiphase Flow Law Based on Phase Field Method

Tianjiang Wu, Changhao Yan, Ruiqi Gong, Yanhong Zhao, Xiaoyu Jiang and Liu Yang ()
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Tianjiang Wu: Oil and Gas Technology Research Institute of Changqing Oilfield, China National Petroleum Corporation, Xi’an 710018, China
Changhao Yan: Oil and Gas Technology Research Institute of Changqing Oilfield, China National Petroleum Corporation, Xi’an 710018, China
Ruiqi Gong: National Engineering Laboratory for Exploration and Development of Low-Permeable Oil and Gas Fields, Xi’an 710018, China
Yanhong Zhao: National Engineering Laboratory for Exploration and Development of Low-Permeable Oil and Gas Fields, Xi’an 710018, China
Xiaoyu Jiang: School of Chemical and Environmental Engineering, China University of Mining and Technology-Beijing, Beijing 100083, China
Liu Yang: School of Chemical and Environmental Engineering, China University of Mining and Technology-Beijing, Beijing 100083, China

Energies, 2024, vol. 18, issue 1, 1-19

Abstract: The characteristics of CO 2 seepage in reservoirs have important research significance in the field of CCS technology application. However, the characteristics of macro-scale seepage are affected by the geometrical characteristics of micro-scale media, such as pore size and particle shape. Therefore, in this work, a series of numerical simulations were carried out using the phase field method to study the effect of pore structure simplification on micro-scale displacement process. The influences of capillary number, wettability, viscosity ratio, interfacial tension, and fracture development are discussed. The results show that the overall displacement patterns of the real pore model and the simplified particle model are almost similar, but the oil trapping mechanisms were totally different. There are differences in flow pattern, number of dominant flow channels, sensitivity to influencing factors and final recovery efficiency. The real pore model shows higher displacement efficiency. The decrease in oil wet strength of rock will change the CO 2 displacement mode from pointing to piston displacement. At the same time, the frequency of breakage will be reduced, thus improving the continuity of CO 2 . When both pores and fractures are developed in the porous media, CO 2 preferentially diffuses along the fractures and has an obvious front and finger phenomenon. When CO 2 diffuses, it converges from the pore medium to the fracture and diverges from the fracture to the pore medium. The shape of fracture development in the dual medium will largely determine the CO 2 diffusion pattern.

Keywords: phase field method; simplification of pore structure; CO 2 displacement; wettability; fractures (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: 2024
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