These guys are fairly shy, so bring a bola, a bat and a healthy supply of eggs if you want one in your base. I have never successfully tamed one, (which I would love to xD) however my past experience has proven that bolas work on these guys and that once knocked out, they prefer bigger eggs (tame a female Diploducus for best results, but be warned, as you might want to upgrade your inventory a few times before attempting to carry the eggs or tame the Oviraptor while it is near your base. Again, I have never personally tamed one of these, but I know how it goes as I have managed to knock them out before.
I've noticed that oviraptors tend to glitch out of pens and Dino gates. So I started loading wood til they can't move. Won't help if your trying to get a fertilized egg but will allow there bonus egg production to work without losing them.