You can set up what pages (and what home page) each user sees.
Thus if you have 50 wells, but user 'Joe' can only be allowed to see wells 1,3 and 5, then you can go into the users and groups menu and set his username up to just see those pages......
Same with user 'Mary'. If she is only allowed to see wells 3, 7, 9 and 12, then just tick those page numbers in her username config and you are done.
Her and Joe can both see well 3, but nothing else is in comon between those two users.
However, I don't think you have set each well up for a page?