I worked in Wyoming for a short time for a Camp Catering Service, my boyfriend did for a over a year, my daughter still works for them.

The company requires you to live on site, 24/7, for three to six weeks at a stretch, with a week or two weeks off(depending on how many weeks straight you work). Some have worked 9 weeks straight. You are given room and board, and work 10 or 12 hour shifts daily. 10 shifts for some are split morning to afternoon. Time goes in on Tuesdays, reported weekly, due to the day of reporting, a lot of the overtime is not paid. This company is a Canadian based company, their laws in their country do not allow anyone to work more than three weeks at a time, with a week off.
The US company is constantly struggling for help, often calling people in early from days off, or not allowing them their days off till later.
You get moved from camp to camp so they "lose" track of you, and therefore don't have to follow the rules as they are starting you over from camp to camp.
They also make promise of raises or promotions that get taken from you without saying anything.
If you are a camp manager, you are on a 12 hour shift, during the day, if you are short handed, you have to fill in till they get someone else, and will not get paid for all hours worked. During the night if you have guys checking in for rooms for the rigs, you have to get up, check them in, and you do not get paid for it.
The turnover rate is tremendous, when new hires come in, if they aren't managers or cooks, you are required to help with other duties, and most of them "forget" to tell you that if you work extra hours, you are supposed to cut back somewhere, if try to make up for it, you get reprimanded or cited for misconduct.
The work hours and days off are not entirely disclosed until after hire, and you work for a time, they ask you to stay past your scheduled days off, if you get moved to another camp, your normal start of days off passes by, as they are not consistent from camp to camp.
Camp workers and managers are hourly employees, I cannot believe this type of practice continues in this day and age. And if you fuss at all, well, they don't have a place for you any longer, without any type notice, you could be on your way back to work from days off.

I'm not sure what to tell you, except none of that is illegal, except possibly nonpayment of overtime. And if this meets the criteria of a "seasonal employer", even overtime pay is not required by the Fair Labor Standards Act. Wyoming does not have an overtime law of its own for general employment The exception is under Section 13(a)(3) and can be found here (when the page comes back up; it's down at the moment).
http://www.dol.gov/esa/regs/statutes/whd/0002.fair.pdf

Is this camp open for more than 7 months of the year?

Camps are run year round. These are permanent camps, they have their own water system, trailers for rooms, food service, laundry facility. They are contracted by the gas drilling camps according to specifications. There are some
camps that do close, the employees are sent to other locations. No one is considered seasonal help in any capacity.

Just a thought, but overtime is mostly federal (FLSA) and not all employers are subject to FLSA. The general rule is that the employer must have at least $500K in annual sales or engages in interstate commerce.

http://www.dol.gov/esa/regs/compliance/whd/whdfs14.htm