It is possible for payments to be made by the purchaser or the operator. I believe in this case that Koch was a purchaser instead of an Operator. One of the clues we can use is locating the owner transfer records on the wells. Newer records are a bit easier. Older are a bit more difficult. This is done on a form 1073 through the OCC. I pulled some records and there were two that showed Koch was the purchaser when the operator transferred.
You can get to these same records here
Search location on 1302S05N . You can then sort by date and look at pre 2000 transfers on the 1073. There are at least two wells that show up. API 3513722600 and 3513706165
Drop the 35 (the Oklahoma state designation in the code) to search directly on the well API
3513706165 appears to be still producing.
Usually when it goes to the state, there is more detailed information tied to it. Unfortunately it is sometime difficult to get the info unless you have proven ownership to the point payment is made. But sometime you need the same data for clues to be able to research and get the documentation to prove it.
At the same time you run into issues where all they will give you is the above $100 routine as you stated above. I believe much of the information is limited due to fraud prevention. I have sometimes been able to get slightly more info in person, but only after they saw that I had some additional info.
County Clerk index records for 13-2S-5W would need to be searched. They are online from 1996 to the present. This is a line-by-line search in a few sets of books. You should be looking for transfers, leases and other documents with his name on it. You can order copies of the index itself. Depending on the amount of pages, I've paid from $50-$200 to get these.
Other than that, you’ll need to pay someone to physically go to the courthouse and search the records for his name. It should be a simple search if you are limiting it to 12 2S 5W. But each section has to be searched separately. There are about 5200 sections in Stephens County.
It is also very possible there is not a mineral rights ownership. It was very common for a Geologist to take an Override in a lease or well bore as payment (or partial payment) for work performed. So you may have an ORRI instead of an actual mineral interest. These die with the lease or the well they were assigned to.
If there is still current production on a well in the section, the purchaser would be Enterprise or Oklahoma Petroleum Allies, or American Petroleum Corp.
APC is the Purchaser on the McQueen well, 3513706165.