A Liner Hanger is a tool/system that is used to hang a liner or screen in a production well
Key reasons of using liners are:
· Open hole is cased off faster
· Less weight for a wellhead
· Better cementing
· Less Rig capacity required
· Cost advantage over a full casing string
Modern liner hanger systems consists of a liner hanger, polished bore receptacle (PBR) and a liner-top packer.