cap had been diverting about 15,000 barrels a day -LRB- 630,000 gallons -RRB- to a ship. BP still is recovering an additional 8,000 to 9,000 barrels a day -LRB- 336,000 to 378,000 gallons -RRB- through a line connected to another vessel, the Q4000. As we start to ramp up the additional containment capacity, we should see less and less flow, Wells said. The Helix Producer recovery vessel is expected to begin collecting oil Sunday evening, Wells said, and officials hope to reach its full collection capacity of 20,000 to 25,000 barrels -LRB- 840,000 to 1.5 million gallons -RRB- per day within three days. Over the next two to three weeks, 60,000 to 80,000 barrels -LRB- 2.52 million to 3.36 million gallons -RRB- a day should be collected as part of the containment process, Wells said. Scientists estimate that 35,000 to 60,000 barrels of oil are spewing daily from BP's breached well. BP says there will be a period of decreased oil and gas capture from the wellhead during the cap replacement. It said another recovery vessel, the Q4000, should continue to capture and flare oil and gas. There will be other recovery vessels and skimmers deployed. Two more oil skimmers were added to the Gulf Sunday bringing the total to 48 collecting an oil and water mix from the surface, BP officials said. And another 15 burns were conducted in calm seas. It was a good day in trying to contain the oil