1. Use them. They probably changed the deer travel in your area, yes, but the new routes, the new sign will clue you in to what is happening in the here and now. It's not that likely that they are taking up the entire property with machinery right?
2. If they are drilling, you are getting paid bank right?

The real good news is that with all of those checks rolling in, you can get out and buy more land to hunt in the future. Think positive bud.
3. If you absolutely can't hunt it, then I am sure you find some public or other private land to hunt. I didn't think that it would be easy to get permission to hunt on someone elses land, but you never know till you ask and offer your help with something they may need. Good luck brother.