Pros
You can gym every day and there's free food. Sone nice people but after 50 days even these get on your nerves. If you like doing nothing and just want to cash a pretty large pay check then it will do.
Cons
No challenges. Whatsoever. You will get horrendously bored. You live on a boat for 7 weeks at a time and the holiday that you do get gets eaten into by training and crew changes, so it is more like 2 weeks. Poor communication. Schlumberger are imposing constant changes that hinder you ability to work. They have no understanding of how western work. Oil price is bad, but everyone is scared for their job as nobody is safe. They fire at will for little to no reason. Prospects for future very low. No career progression really, no transferable skills and not told about how bad it was by interviewers, everyone wants to quit but feel trapped by the large salary.