Andy
It’s my understanding that pipe is owned by whatever entity paid for it. It may be abandoned, cut etc and float to the surface (erosion) You the landowner can’t do anything about including having it dug on your dime. There was a case a number of years ago addressing this issue out Houston. The rancher paid to have it removed but had to get to permission even though it was not producing and was eroding to surface making his livelihood in running cattle more difficult because of not being able to use machinery easily. I was approached a few years ago about pipe and wanted non of the stuff on my land and told the guy you can go around land that I own…i was labelled difficult because the dingdong told my cousin. He didn’t realized I’m related to everyone and we talk. 
oh and old pipe can oz oil and is lined with asbestos. Environmental remediation has to be involved