[21twelve]

They very well could be. There are drilling machines (and I imagine pile drivers) that can be taken apart and hand carried - down elevators or up mountain trails.

I guess going 5 to 8 feet at a time to 200’ deep is still easier than going to 15,000 feet at 30’ at a time to reach oil.

[spokeshave]

surely you jest,

There are drilling machines (and I imagine pile drivers) that can be taken apart and hand carried

Pile driver:

Drilling rig