the in-laws used to have a driven well, with a sand point that would rust shut and or clog with sediment every three years. The easy solution was to pull the pump and motor, drop a 1/4 stick of dynamite down the pipe, and blow the point, pull the pipe re-attach a sand point, and new bottom section of pipe, and re-drive the well point into the newly opened cavity.
It is a shame that we can no longer get this stuff, back "in the day" it was just another tool.