There are no "helium wells". Helium is extracted as a byproduct of natural gas extraction. Meaning it comes up mixed with natural gas and if the production facilities have the right equipment can be separated from it.

I mean a hole in the ground that has helium in it is kind of a helium well, even if it's polluted with natural gas.

Not all natural gas wells have the same percentage of helium in them[1]. "Helium wells" generally refer to wells that have a high amount of Helium relative to others. Those are the ones you would extract Helium from first.

[1] https://www.sciencebase.gov/catalog/item/609e8fe1d34ea221ce3...

Yes, sorry, short-hand. Natural gas comes out of wells, and with it helium. Since we're focussing on the helium, I called it a helium well. Indeed, sometimes helium itself is the target, not the natural gas: https://www.smithsonianmag.com/smart-news/scientists-found-h...