When I was eighteen, I applied to work for an oilfield services company. I had no clue as to what the work entailed, and had never actually seen an oilrig in my life, but I got hired anyway.
It was a very busy period and there was lots of drilling activity, which lead to a chronic shortage of hands. Just like right now.
Main criteria for getting hired on?
Show up.

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And I can honestly tell you that there is no more rewarding life than that of a nomadic oilfield technician. You get to see the world, while being paid a King's ransom to do it.
The scenery changes all the time and you will NEVER be bored. Honest.
You can leave any time you want, and come back whenever you like. As long as you're good at what you do.
There are LOTS of eighteen and nineteen year old trainees at wellsite. Specialised education is an asset, but not a necessity.
None are poorly paid.
A buddy of mine just finished a job that ran from early november until mid february (nonstop). He cleared sixty grand for this period, after taxes. He's been in the oilpatch for just over five years, total time.
Something to think about, eh?