You want the specs for a Bell 412, a Sikorsky S92, or the EH101 and N90? Different companies have different fleets.
Bell 412
Sikorsky S92
Can't find anything quick on the 101 and 90, only info on the military variants. But the
Sikorsky S-61 is still in use in some markets, even though it's about as old as dirt...
I've flown none of these aircraft, so can't give you a real review, though I have flown UH-1s and a variant of the UH-60. I don't believe the S-70, which is the civilian version of the UH-60 is in the petroleum biz, but I could be wrong.
Also check out the
Petroleum Helicopters site...they're probably the biggest name in the rig aviation support biz.