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We also know that the oil tends to mix with water to produce a "chocolate mousse" mixture. The controlled flow rates of wells drilled by BP's at its Thunder Horse platform (another deep water platform) seemed to produce oil of 40,000 to 50,000 barrels a day, when the wells were in maximum production based on the graphs below from this post:

Thunder Horse Main - Oil Production by Well, in Thousand Barrels per Day, based on data of Minerals Management Services
Thunder Horse North - Oil Production by Well, in Thousand Barrels per Day, based on data of Minerals Management Services Natural gas production is in addition to the oil production shown on these graphs, bringing the barrel of oil equivalents up somewhat (10% - 15%) from this level. This Deepwater Horizon well is different, so this may not have particular relevance