I occasionally end up with polluted water in the oil well because it's more cost efficient to repair than to run a filter. Now, however, the well will run with polluted water, but not produce any oil. It didn't just use it and take damage and move on. There isn't an empty option like there is on a lot of other things. I'm just powering this now for no reason with what seems to be heavy conductive wire.
Have oil well. Pump in polluted water.