Table 3
Well test schedule and fluids composition.
Water injection | Tracer injection | Water injection | Shut-in | Production | |
---|---|---|---|---|---|
Duration (days) | 10 | 0.5 | 1.5 | 3 | 5 |
Cumulative duration (days) | 10 | 10.5 | 12 | 15 | 20 |
Flow rate |
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– |
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Aqueous composition | – |
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– | – | – |
Comment | Waterflood leading to a residual (immobile) oil saturation state S orw in the near wellbore region | Inert tracer and ester injection; ester partition between water and oil; small amount of alcohol generated | Ester pushed 5 m away from the well; small amount of generated alcohol is pushed downstream the ester | Significant amount of alcohol generated from ester degradation | Recovery of ester and tracer; production of alcohol; delay between alcohol and ester |