Requesting an easement

[Mona V.]

I bought a property where the head of the well head had not been taken out since 1967, now that I did to chlorinate it, I realised it lies a few feet into neighbor's property. There is no well easement currently, since nobody ever tried to find out where the well is. I guess my best chance here would be to ask for an easement from the neighbor so that I can maintain the well, or maybe ask him to sell that little piece of land to me?  I have never entered this situation before so any ideas to approach this in a better way? 

If I don't get the easement, I guess neighbor would need to abondon the well and I would need to drill a new one. Well is not shared between properties, but looks like it used to be one big lot long time back.