How do I find out if a well is still producing?

I have wells in Oklahoma that I'm not receiving any money. The operators seemed to have died. How do we find out if a well is still producing or not?

Do you know the actual, legal name of the well? Or do you have a legal description of the location on a lease or other document? If so, you can go thru the State of Oklahoma website for oil and gas (OCC) or the tax comission and find out. The tax commission would receive tax payments from the purchaser most likely, and the OCC would have monthly reports filed for production.