Numerical investigation on immiscible displacement in 3D rough fracture: Comparison with experiments and the role of viscous and capillary forces

176We perform 3D direct numerical simulations for the displacement of oil by water in rough fracture. The simulated results can generally reproduce the dynamic invasion morphology at the scale of fracture. Haines Jump is observed in the capillary-dominated flow regime. Further quantitative analysis reveals that as the effect of viscous force gradually becomes dominated over that of capillarity, void-filling toward the outlet is continuously enhanced in rough fracture.