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Exact(57)
The second experiment was conducted on a different sand pack.
Now, water flooding is started into sand pack.
Permeability was measured by brine flooding through the sand pack.
(2) CO2 was injected into the sand pack until a gas breakthrough occurred at the outlet of the sand pack.
The pressure difference across the sand pack, ΔP 1, was measured for calculating the initial permeability of the sand pack.
Therefore, CO2 subsequently injected was diverted into the low-permeability sand pack from the high-permeability sand pack to increase the oil recovery of the low-permeability sand pack.
With more formation water injected into the sand pack, the sand pack permeability changed slightly and the final permeability reduction remained at 93.8 %.
At this stage, 0.5 PV (60 ml) of surfactant slug was introduced in the sand pack.
Similar(3)
Due to the small flow resistance in the low permeability sand-pack, the acid solution can easily enter without causing damage to the high permeability sand-pack.
The sand-pack cores were modeled with 10 blocks each for surfactant flooding (Fig. 2).
Then the sand-pack was placed at 65 °C until the polymer gel was formed.
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