Water injection is an important recovery method in deepwater reservoirs. A certain water injection volume is required to maintain target oil production. A short injection / fall-off test is therefore often conducted to evaluate well injectivity performance prior to oil production. Following that, permanent downhole gauges are set to monitor full field development scale. Pressure transient data from the permanent gauges are then also analyzed as long-term injection and fall-off tests. Reservoir parameters, such as permeability and skin factors can be obtained from these short- and long-term tests. However, several questions must be asked about the interpretations, such as 1) What do we actually see into formation, i.e. injected water or reservoir oil? 2) Do the permeability and skin values change with time? 3) How can we capture and understand reservoir changes versus time?
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