Engineering Expert: “Gas hydrate crystals” may be plugging cracks in well; To be dislodged by increasing pressure?

Gas seeps not necessarily a problem, because pressure in oil well rising, officials say, Times-Picayune, July 19, 2010 at 20:12 EDT:

Bill Gale, a California engineer and industrial explosion expert who is a member of the Deepwater Horizon Study Group, said… that gas hydrate crystals could be plugging any holes in the underground portion of the well, and they could get dislodged as pressure builds.

[link to www.floridaoilspilllaw.com]