http://www.huffingtonpost.com/jim-moore/nobody-knows-the-trouble_b_561796.html(some choice tidbits from the article)
BP and Transocean, which owns the rig, has said there was a maximum working pressure of 20,000 PSI but the system was able to handle a kickback pressure from gasses of about 60,000 PSI. The breakdown of the blowout preventers can be interpreted to mean the pressure coming up from the hole exceeded 60,000 PSI. Generally, various mixtures of mud circulate up and down the drill pipe to act as lubricants and equalize pressures encountered at great depth, and this process was said to be working at the time of the accident. Does this mean it's possible, even likely, that the Deepwater Horizon encountered pressures current technologies are not equipped to handle?
>snip<
The latest plan is for a special funnel to be placed over the spout, which will then force the flow into a pumping channel. But how does a funnel get placed over the top of anything pushing at that kind of pressure?
>snip<
A well blowout in 1979 offers a bit of context; except the Deepwater Horizon horror show is already about to transcend what happened in the Bay of Campeche off the coast of Mexico. The Ixtoc 1 rig blew and began to spew crude that flowed uninterrupted for nine months. Before the well was capped, 3,000,000 barrels of crude had drifted north to Texas and the northern coast of Mexico.
>snip<
NOAA apparently believes the situation is on the verge of getting worse. A leaked memo suggests that the tangle of pipes on the ocean floor are covering and constraining two other release points. Pressure is likely to blow those loose and, according to NOAA, the gusher will increase by "orders of magnitude." In most interpretations, that phrase means a ten-fold rise in the flow, which will replicate the Ixtoc disaster in three days.
According to the non-profit, non-partisan Air and Waste Management Association, a quart of crude oil will make 150,000 gallons of water toxic to aquatic life.(if you aren't frieghtened by this now, I don't know what it will take)