My idea is a large steel screw. The screw would be very long with a very gradual enlargement to the top.
The point would be small and the diameter enlargement would be so gradual as to minimize the flow reduction until it started getting very deep.
At a certain depth the diameter of the screw would equal the hole diameter and flow would begin to be stopped but there would be enough of the screw in the hole to minimize blow past the screw. At a certain point, it would then be needed to start the screw twist to dig deeper and deeper. At the top of the screw there would have to be a bracket in order to screw the screw deep and tight.
When the flow had stopped enough a reinforced concrete cover would be placed around the screw,
It might be better to place a large concrete pad down first with a hole in the center at the oil hole, then the screw could be screwed down to that foundation.
Harrell Geron
Civil Engineer for the USDA
Temple, Tx
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