What is the purpose of a tie back receptacle?
A tieback receptacle is primarily used in a situation where the liner is being run, or tied back, to the surface and is to be cemented in two stages. This makes for a more uniform cement completion. In the Rigger Engineering design the tie back receptacle, sometimes called a PBR, is located below the liner hanger. The ID of the receptacle is approximately the same as the OD of the liner being hung. The liner is hung and cemented in place. A tie back stem, which may or may not have seals, is run in on the end of the liner going to the surface. It passes through the liner hanger and stabs into the receptacle. The receptacle acts to center the surface liner and prevent misalignment. The surface liner is now cemented from above the liner hanger to the surface.