Study on Water Cone Behavior in Heavy Oil Reservoir with Bottom Water through Numerical Simulation

Aiming at the problems of early water appearance, rapid increasing in water-cut and difficulty in development of bottom-water reservoirs, in this paper, we have used a conceptual numerical model to quantitatively analyze major influence factors on the coning rule and finally analyzed the remaining oil formation mechanism of these types of reservoirs. The results showed that the heterogeneity mainly causes the uneven advancement of the bottom-water and leads to local remaining oil. The higher the oil viscosity, the faster the non-uniform coning of bottom-water, which accelerates the well flooded and the enrichment of remaining oil. The positive rhythm reservoir is more likely to form water cones than the anti-rhythm reservoir, further exacerbating the accumulation of residual oil at the top of the reservoir. Differences in the seepage field are caused by different well patterns, which leads to different distributions of remaining oil during development. The lower the oil column height results in the non-uniform coning rate of bottom-water accelerating, which intensifies the flooding of oil wells and the enrichment of remaining oil. The water coning rules and remaining oil distribution rules studied above provide a solid foundation for the reasonable and effective development of bottom-water heavy oil reservoirs and has a broad field application prospects in the future.