Sunoco was a transmission company.
Montclair Energy has the Pinehurst 1-10H. Contact them as the operator to get into pay status. 1800 Canyon Park Cir Ste 405 Edmond, OK 73013-6631 is the last address that I see.
Ask them what you need to transfer the royalties to you. Usually require the probate documents, death certificates, your driver’s license, etc.