Can I suggest that you watch the movie Armageddon, the one with Affleck and Bruce Willis. The start of that movie has a lot of detail of an oilrig, but surprisingly it's fairly accurate, even the way they use the equipment is fairly accurate. I used to be an oiltool project engineer, there is some amazing looking stuff on oilrigs, and it mostly sounds cool too.
Look up:
Spider elevators
Latch locks
Iron Roughnecks
But again I think you'd get a fairly good representation just by watching the first 15 minutes of Armageddon, the scale is important so all that footage would come in handy.