Abstract
Water flooding is the dominant fluid injection technique and is frequently applied worldwide secondary recovery process, which involves water injection in the oil formation under high pressure through an injection well to enhance oil recovery of the well(s) of interest. In order to plan implement successful water flooding optimum number of wells and location must be selected. This involves successful and judicious selection of water flood pattern to increase the reserves. This study emphasizes on important and effect of water flood pattern on oil recovery. This paper will also address the effect of the directional permeability on Cartesian and uniform grid. The patterns studied were fivespot and nine-spot pattern and by ignoring the gravity and capillary pressure the designed model will calculate the pressure and the water saturation for all nodes in five and nine spots scheme. The work shows that both pattern schemes produce almost the same tertiary oil under identical reservoir conditions. The nine point’s scheme showed smooth pressure and water distribution compared to five point’s scheme. A breakthrough time was earlier by 40-50 days for the nine spot patterns as compared to five spots pattern.
Highlights
The success of a water flood flood project can be predicted from proper selection of water flood patterns
The results showed that theoretical sweep efficiency from an inverted 9-spot is inferior to a 5-spot pattern by approximately 50% versus 70%
The change of oil production rate can be significantly indicated by the changing slope of RF with Time
Summary
The success of a water flood flood project can be predicted from proper selection of water flood patterns. Clark and Robert [2] showed that the Kuwait Oil Company was able to optimize water flooding using reservoir management team effective in achieving target reservoir pressures in the major part of the reservoir with the active participation of all team members, subsurface and surface alike. Using this approach, water-cut was flattened with effective decline in wet oil production. The technical team must analyze the available data before starting a water flood, and continue to evaluate the production and injection data to determine the water flood’s efficiency and the extent to which infill-well locations should be drilled or patterns realigned
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