Anybody know anything about pulling wells?

The pump is above ground and has a tank on it, by the description it sounds like a jet pack. We dropped a weight on string down the well and it only went about 15 foot or so. When they pulled the well for the cattle yard it was only around 20 foot. Today we are going to try and drive the old well pipe down (have about 2 feet above ground)and see if we can't free the pipe to pull it. Figure it is worth a try and we can't end up any worse off than we are now.
Last night went to get water from the cattle yard (separate pump)and the cistern was froze.