Tim has the right of it. Translocating rattlesnakes is sentencing them to a slow death by starvation, stress, exposure, or predation. You won't be doing the rattlesnakes any favors by releasing them. If you don't take them to a venom lab, the ethical thing do to is to kill the snakes outright.
In general, it is also illegal to remove rattlesnakes without a permit in Oklahoma, although if they are creating a nuisance on privately owned land (as in this case), then no permit is required. For details, visit the
Oklahoma Department of Wildlife Conservation.