GOR Variation in Fractured Carbonate Reservoir: Different from a sandstone reservoir?
Whether the following statements associated with a sandstone reservoir – will also remain true for a fractured carbonate reservoir?
(A) The gas expels oil from the reservoir formation by means of (a) gas carrying oil with it due to its velocity; and (b) gas driving the oil ahead of an expanding volume of gas.
(B) Since the reservoir pressure gets reduced by the earlier completions, the amount of gas required to expel the same quantity of oil would remain greater; and in turn, the enhanced initial GOR for later completions would result only from the drainage of pressure by the earlier wells.
(C) When the gas acts as the only force that expels the oil from the reservoir-formation, then, the rate of decline of oil production would remain faster than the rate of decline of gas production. Also, an enhanced rate of increase of GOR will always have the greatest decline of oil production.
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