Seeing the OP's other post about a 2" well casing, it sound's like a
driven well in soft sandy soil. Presumably it has an inlet screen and
point on the end and sand / silt has come in through the deteriorating
screen. Makes me think just driving a new point and casing nearby is the
easiest solution.

Close. It is a driven well, but when they got it ~20 feet down, they
dropped a stick of dynamite into the bottom to "make a cavity for
water to collect". I have no idea what is really down there, as that
was 40-50 years ago. It's an old well, but an old fellow a few doors
down was here when they drilled it. Our valley used to be river
bottom, so there is sand and river rocks. It can be quite a task just
to drive a pipe 20 feet into the ground because of the rocks.