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Let gravity do what, exactly?

The water is flowing out of the well because its internal pressure is enough to overcome gravity. Increasing the well-bottom surface area would increase the flow rate.

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I think the idea is to collapse the well walls.

Pressurized water isn't stopped by rubble, it's stopped by solid materials. Explosions turn solid material into rubble. Seems like a terrible idea.

Well, this had been a valid way to deal with oil wells that couldn't be capped. Why wouldn't it work for water?

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