TITLE:
Study on Seepage Law of Heavy Oil Reservoirs during Water Flooding Based on Ultra-Large-Scale Physical Simulation
AUTHORS:
Yanan Xu, Junshou Zhao, Qiang Sun, Xun Yuan, Yichao Zhang
KEYWORDS:
Late Stage of Ultra-High Water Cut, Ultra-Large-Scale Physical Simulation, Lateral Accretion Body, Seepage Laws, Remaining Oil Distribution
JOURNAL NAME:
Journal of Geoscience and Environment Protection,
Vol.14 No.9,
September
9,
2026
ABSTRACT: Aiming at the problems of developed dominant seepage channels and difficult mobilization of remaining oil in the late stage of ultra-high water cut in Bohai Q Oilfield, combined with the development characteristics of point bar lateral accretion bodies in meandering rivers, a large-scale physical model with a size of over 1+ m was established, and water flooding experiments were carried out under different well pattern modes. The results show that the ultra-large-scale model can effectively weaken the boundary effect and accurately characterize the gravity effect; the development mode has a significant impact on oil recovery; the evolution of the flow field presents the characteristics of vertical differentiation and planar heterogeneity; the synergistic effect of macroscopic physical property shielding at the interface and discontinuous microscopic capillary force leads to the enrichment of clustered remaining oil in the upstream of high-permeability zones. The research results provide an experimental basis and theoretical support for the well pattern optimization of lateral accretion bodies and the tapping of remaining oil potential in thick sandstone reservoirs in Bohai.