There are numerous producing horizontal gas wells in the area of your minerals. The Austin Chalk and Eagleford formations are the targeted formations in this area. Some of the operators in the area are Stroud Oil Properties, Union Pacific Resources, Enervest Operating and S M Energy.
Dyson Energy has an approved permit for a horizontal well in Section 5/A-7 as of April 13, 2017 to drill into the Austin Chalk formation. These are decent gas wells with condensate.
Link to approved permit for well 477-31044:
GIS Map of Washington County A-7/Section 5/S F Austin Survey and surrounding area:
CLICK ON MAP TO ENLARGE
I would ask for 25% royalty and also ask for no post production costs or deductions.