Black Gold

There's an oil donkey near our house, you used to be able to hear it chugging away until it broke down, they gave it a new engine and now you can't hear it at all.  
Every once in a while this big thing appears on the spot, I think it's a drill?
I don't know much about it...I know if you find oil in your back yard it's not yours - ha!  someone else owns the the valuable stuff under the ground...I'll be sure not to dig too deep when I'm gardening then LOL