How do I get a job, in the US, as a roustabout on an offshore oil rig.?

I do not have any experience in that field but I do have some construction experience.How do I get a job, in the US, as a roustabout on an offshore oil rig.?
First contact the company you are interested in going to work for (ie..Tidewater) and find out what qualifacations you need and if they have schools that will help you get them. All oil rig workers have to be certified by the U.S.Coast Guard, so there will be some schooling before you get on board. Good Luck!