GOR
(1) The magnitude of volume of gas required to move the oil through the reservoir formation to reach the well keeps increasing as the well becomes older. In such cases, if the production gets associated with a water drive, then, how exactly GOR will get influenced?
(2) If the hydrostatic pressure remains greater than the initial rock pressure, then, the GOR will remain as a ‘constant’ throughout the life of the well? Further, if there is no water pressure associated with the reservoir-formation, then, what will happen to GOR?
(3) The rate of decline of GOR with regard to oil production will depend
(a) on the degree to which the well has declined; and
(b) on the difference between rock-pressure and hydrostatic pressure.
Any other sensitive parameter that could possibly influence the rate of decline of GOR?
GOR is the volume of gas that emerges from the solution for the volume of oil under standard conditions. As the reservoir pressure continues to decrease, the gas saturation increases until it reaches critical saturation when the gas begins to flow. The GORs increases rapidly at this point. In the absence of formation-related water pressure, the rate of decline of GOR relative to petroleum production will depend on rock pressure and hydrostatic pressure.
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