Reply #3: This proposal makes sense to me. A tapered solid insert, a cork, but much longer.

[NYC_SKP]

hodiebkhalifa, I forwarded your message to Governor Crist, and also to the Santa Rosa County
Authorities including a contact I have in office of Mayor Thompson of Milton.

I don't know where your comment violated terms of service, but I suspect that BP had it removed.

hodiebkhalifa said:
"As an expert in oil fields in the Middle East, I've already offered BP the following simple technique that can instantly plug the well. Though BP admitted it can work, it wouldn't implement it because it will kill the Well.

PLUGGING BP WELL BY A STRING OF CEMENT-FILLED CASING PIPES:
{BP has to lower down the wellbore through the Riser Pipe Stub and the Blowout Preventer a string of 16"- 18" Casing Pipes connected together 500-1000 ft long after being filled with cement. BP Well will instantly be plugged and there will be no need for the Relief Wells. The annular space between the Casing Pipe String and the well walls can be filled by pumping cement. The whole operation will take few hours}

http://www.pnj.com/comments/article/20100613/NEWS01/6130321/Oil-spill-BP-fires-92-cleanup-workers

You know, this seems really doable with the riser out of the way.

I'd recommend a very long tapered plug, increasingly larger diameters from the bottom tip up, to the point that the largest diameter nearly seals the 20"diameter opening.

The taper would ensure a gradual change in fluid dynamics and pressure.

Why wouldn't this work?