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A VERY timely question.
The formation of gas hydrates is quite complex. Fortunately, there is a Wikipedia link, with (as usual) excellent information. Formation of these crystals requires the presence of methane, high pressures and cold conditions, all of which have been met by the blown out well. The ocean floor at 5,000 ft is approximately 42 degrees. These crystals will clog pipelines. Apparently this is what happen when the cofferdam failed to work. One very interesting fact is that the methane hydrates formed in the dome of the cofferdam and added bouyancy. A redesigned cofferdam might be heavier.
Hydrates have been a problem in Canada and Alaska wells and pipelines with the usual treatments of lower pressures, heat and methanol treatments.
See related link - particularly about the most recent experience with the Deepwater Horizon.
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