[PetrolBlueSC]

It would depend on what is outside the pipe. If there is already concrete outside the pipe, filling it in with cement should be fine. +1 to checking with local code. If there is concrete outside the pipe, it will be very difficult to pull much of the pipe out. If there is soil/sand/bentonite outside the pipe, you may get some but not all of the pipe. It will seperate at a joint or rip the screen apart. I would expect local code to expect you to try to get some pipe out. The point in the end is to prevent the well from being a conduit, allowing contaminants at the surface to get to the aquifer.