It really depends on what you want to do on the rig. If you come in already skilled and get a chance for an expates position on the rig as a mechanic you're looking at bringing in about 400-500 dollars per day. But mind you this is a 28/28 day rotation. you only work 6 months out of the year and your clearing 70,000. If your lucky and wind up being shipped to another country you also get a traveling bonus which could be in excess of 15% of your gross pay per day as well as extra pay depending on whether or not the country is deemed a hardship. If it is deemed a hardship you're looking at another 7-19 % percent on top of your travel allowance.
Most companies pay for your travel and lodging to and from the rig. if you work in the Gulf of Mexico, you have to provide your own ride to the heliport, or the boat dock. Taking a boat to a rig sucks majorily. A helicopter isn't so bad.
Most rigs, offshore and inland have excellent food and recreation facilities.
If your interested in working the rigs hit me up with an IM, let me know where you live and what kind of qualifications you have. I know we are currently looking for people to work 3 rigs we just moved to the States.