Bottomhole samples were obtained from eight different wells in an undersaturated offshore oil field in Brazil.Atotal of 25 samples were obtained from these wells at various depths. The well temperature data show considerable gradient in both the horizontal and vertical directions. Bubblepoint pressure measurements reveal unusual variations. Some of the wells have a gradual increase in bubblepoint pressure with depth. Some other wells show a decrease after increase and some wells a decrease with depth. The decrease in bubblepoint pressure with depth is the common behavior. There are also vast variations in measured composition, oil density, and the molecular weight of last fraction in different wells.
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