Liner hanger

Cementing & Well Integrity

A liner hanger is a mechanical device used to suspend a liner (a casing string that does not extend to the surface) from the bottom of the previous casing string. It grips the inside of the parent casing using slip assemblies and provides a seal to prevent fluid communication between the liner annulus and the hanger area.

Using a liner instead of a full string saves significant steel costs. Modern liner hangers are often 'expandable' or feature rotating capabilities, allowing the liner to be rotated while cementing to improve bond quality. The top of the liner is usually polished (PBR) to accept a tie-back seal assembly if needed later.