Laboratory Evaluation on the Water Flooding Characteristics in Bottom Water Reservoir Containing Interbeds

Abstract

Sandstone reservoirs with bottom water drive are widely distributed all over the world, which are characterized by the complex process of oil and water storage and transmission. At present, the research on the water flooding process and oil–water evolution characteristics in bottom water reservoirs containing interbeds needs to be strengthened. In this study, water flooding experiments with different placements of the interbeds were conducted using a two-dimensional (2D) vertical model. The results demonstrated that the interbeds make the bottom water flow upward more evenly, resulting in decreased incursion speed, increased displacement area, and better displacement effect. Moreover, compared with the tilted interbed model, the horizontal model has a 6% higher oil recovery rate, exhibiting a better oil displacement effect. The results presented herein will provide important guidance on water control in bottom-aquifer oil reservoirs containing interbeds and will promote unconventional petroleum resources recovery.

Research and Practice on Implementing Segmented Production Technology of Horizontal Well during Extra-High Water Cut Stage with Bottom Water Reservoir

“…Wang et al [8][9][10][11] researched the water control technology of horizontal wells completed with AICDs/ICDs in bottom water reservoirs, which was best applied to new wells in the early stages. Li, P. F. et al [12][13][14][15][16] carried out a systematic study of laboratory evaluation on the production performance of oil reservoirs with bottom water and discussed influencing factors of water breakthrough in horizontal wells in reservoirs with bottom water. Sun, G. et al [17][18][19][20] studied horizontal well inhibiting water coning and tapping the potential of the remaining oil by numerical simulation methods, and the results suggest that a reservoir with low vertical permeability and an interlayer above the water-oil contact would have a good effect on water extraction and cone control, providing a good direction for the optimization of target wells for water control and plugging measures.…”