I'd settle for a 2" pipe which according to this s

I'd settle for a 2" pipe which according to this site http://www.1728.org/flowrate.htm would allow a max 335 bpd to flow through it.  I think most would be happy with that!

Just for a laugh, I calculated for a 36" pipe, and velocity of 1 foot per second.  Result: 52.877 gallons per second.  One barrel equals 42 gallons.

52.877 / 42 = 1.2589 barrels per second * 3600 = 4532.3143 barrels per hour * 24 = 108775.5429 bpd!  At that rate we'd tap out the entire 6,000,000 recoverable oil in three days

http://en.wikipedia.org/wiki/Barrel_(unit )