There are 4 producing vertical oil/gas wells in Section 14. Production is coming from the Spraberry Formation. Athlon Holdings is the Operator. I also see 1 dry hole was drilled in the past. Next door to the South is a producing horizontal well(API 227-38640). Link to production data on well 38640:
Mark- Also read the Royalty Deed carefully to make sure it is perpetual. Some deeds are only for specific terms or are tied to an existing lease, and expire when the term runs out or the lease expires.
Look at Texas unclaimed funds to see if any royalties have been sent in under grandmother's name and also ask the operator about title and any funds in suspense. Check the on-line deed records to see if grandmother assigned the interest to anyone else.