'nother question. I'm not an engineer so maybe this isn't feasible. But why are we trying to plug the leak? Why not just make it so that the leak is leaking back to the oil platform and thus allowing us to actually use the oil and not have it end up in the ocean?
That's what they were trying to do with that dome thingy.
Now I'm not a physicist, but I suspect these are some of the issues.
First, think of a straw, blow liquid through it. It's small and short and squirts quite easily. Now try to blow water through a 25 foot garden hose. Now, imagine a hose a mile straight down. Imagine the difficulty of moving a mile of water, not just side to side, but from down to straight up.
Now, imagine that the well is actually 2 and a half MILES further down straight through solid rock which has been drilled through. Oil is lighter than water. All that pressure of land and a mile of water is squeezing it out. Like an enormous zit.
So someone says, "Why not stick a tube down there and suck up all that oil. Use the pressure of the oil gushing out to force it up into the tube.
Ah, but a tube made out of what? What could take the pressure? Especially with that amount of oil? Maybe a carbon composite? Maybe, but no one has ever made one that big.
Well how about using a giant vacuum to suck it up? Except there aren't any that big.
So how do that stop it?
Well, from the very little I've read, they drill small "controlled" tubes along the length of the well and pump in some kind of sealant, concrete or something similar.
Now, it is was up to me and considering the depth, the amount of water, the current, I might set off a small nuclear explosion. The radiation would be spread though the water and disperse and it would probably seal the well long enough to put a meaningful cap in place.
Of course, that's just my idea. The amount of radiation, the size of the explosion, they can be calculated. Beside, there is so much contamination now, what's a little more compared to lots more?
But I don't know, I'm not a physicist. Just a regular guy looking at the possibilities of something I admit I know very little about.