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With systems of this type, chokes can be set to isolate a zone or to provide a more uniform inflow profile, which acts to delay the breakthrough of water and gas.
Both inlet and outlet flow lines were designed with minimum volume to decrease the dead volume effect which delay the breakthrough in real time and makes non-simultaneous response with pressure drop (Appendix 1 shows improvement using detector probe).
Figure 5 compares the oil saturation along the streamlines in the model at the breakthrough time and at the end of simulation (6,000 days) where, after placing the barrier fracture, the streamlines had to go around it to reach the producer, which would delay the breakthrough of water.
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WAG greatly enhances the fluid mobility ratio and delays the breakthrough time due to the water blocking effect.
So there exists a contradiction between increasing the well production and delaying the breakthrough time of bottom water.
We observed a delay in the breakthrough of the early injected water between approximately 0.5 1.0 injected pore volume, at 25 °C only; after that, the oil started to flow.
The optimization is then performed on both the injection and production rates to delay the water breakthrough and improve the sweep efficiency of the oil in the region upstream of the obstacle.
The optimized water flooding process will therefore delay the water breakthrough and improve the sweep efficiency in the region upstream of the non-permeable region, and every optimization run will stop once the injected water reaches the production wells.
As can be seen from this figure (Fig. 16), decrease in oil production rate delays the water breakthrough time significantly.
Through optimal rate control, we can manage the propagation of the flood front, delay water breakthrough at the producers, and also increase the recovery efficiency.
The results show that the frequency of the updates does not only affect the sweep efficiency but also contributes to the delay or advancement of the breakthrough time.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com