What is the likelihood oil rig of an 18 year old getting a job on a oil rig?
i am willing to do any position at any location.
If you are willing to work and in any position, your chances are high. This is because some manual positions in this sector do not require formal education or experience. However, having a high level in education is an added advantage. Read more on http://www.squidoo.com/oil-rig-job-description and http://www.ehow.com/list_6685267_oil-rig-job-requirements.html.
Depends how bad you want it. Show desire and competence, you should be able to find something. Though, many employers want or require a technical degree or higher.
That's hard work. I mean HARD work. And dangerous. Not saying you couldn't do it; I don't know you. But think about it.