You can search for production at https://imaging.occ.ok.gov/imaging/OGWellRecords.aspx. It is best to only put in the legal location. No need to fill in every blank. If there has been production, you may have funds due to your father. You can search https://www.occeweb.com/moeasearch/ to look for funds held in escrow. You can also search the Oklahoma unclaimed property website. https://www.oktreasure.com/