74. The steel casing would be destroyed during the blast/s
A large enough blast to collapse the surrounding rock would disintegrate the steel casing. The charge would originate inside of the casing (conduit). Bombs and shells are encased in steel, they definitely are destroyed during detonation.
A series of blast radiating upwards would create enough of a "rockfall" to seal a bore. The rock would have to be heavier then the well pressure, not difficult when you calculate the weight of rock.
I'm not saying this is a done deal, but it is looking like a last ditch effort is all we have left.
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