We won’t get a good read on the cap’s effectiveness until its placement is adjusted and oil production is stabilized. Flow to the surface may also be initiated through the choke and kill lines, which could supplement and improve the effectiveness of the cap system.
Update from Deepwater Horizon Response Facebook page:
The LMRP Cap is in place and nitrogen pressure head is slowly being reduced in the riser. Throughout the day, the vents in the cap will be closed as production begins on the surface. The goal is to ensure methane hydrates do not form in the cap.
Bud's Offshore Energy (BOE) 
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