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Open image in new window Fig. 15 A schematic drawing of the nine-spot pattern.
Open image in new window Fig. 4 Sketch of infilling pattern in inverted nine-spot pattern.
There are 4 regular inverted nine-spot patterns with 16 producers and 9 injectors.
The maximum producing well spacing of five-spot, seven-spot and nine-spot pattern is similar.
Nine-spot pattern is the relatively common pattern type of steam flooding in heavy oil reservoirs.
In comparison with the other well patterns, the controlling area of nine-spot pattern is much larger.
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