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...tion gas expansion, the primary source of reservoir drive energy below the bubblepoint. ..., the gas-oil ratio (GOR) remains constant until the reservoir reaches the bubblepoint.

===Bubblepoint pressure=== ...an infinitesimal bubble of gas from solution when pressure drops below the bubblepoint.

...er drive), no initial gas cap, and initial reservoir pressure close to the bubblepoint: * ''B''_ob = formation volume factor for oil at the bubblepoint; determined for specific separator conditions

...oint pressure, ''p''_b while the reservoir pressure is above the bubblepoint (''p''_wf''_bp''