Even if you don't own the mineral rights, it can be a boon in some cases. If the oil company can't recover the oil through other means (and the zoning restrictions don't preclude it) she can lease her land to an oil company and they can setup a "grasshopper" to pump it out. A great deal of "oil" money is made through land leases. While the land owner may not have mineral rights and subsequently benefit from an oil royalty, the oil company can't just force themselves on to the land.
While the land owner may not have mineral rights and subsequently benefit from an oil royalty, the oil company can't just force themselves on to the land. I have to correct you on that. In Texas, the mineral estate is definitely superior to the surface estate, and an oil company definitely can force themselves onto the land. The Sheriff will help, if necessary.
That's not customary practice, and oil companies definitely want to maintain good relations with surface owners, so financial arrangements are almost always reached.
But if you only own surface rights and are dead set against allowing the owner of the mineral rights to get what is lawfully his, you're going to lose. That's the law.