Slim, you don't have a problem. It's common for most tracks of Texas land to sell with out mineral rights. Even if an oil company came and drilled, you would still come out fine. You would work a deal for a "pad" area, and probably a right of way...all money in your pocket. It's even common for them to drill a water well, giving you full access when it's not is service. If I were you, I would give more thought to keeping out the trespassers and water turkeys ! Bottom line, you don't need their permission to change your land as you see fit.