The Lift Nipple is a
Heavy Weight Drill Pipe Pup Joint for handling the liner hanger assembly and
for using slips and elevator once the assembly is below the table.
The Junk Bonnet
consists of two half metal cups installed around the Lift Nipple with two
bolts. Its main job is to protect the Setting Tool by preventing the cuttings
or other debris from filling the PBR.
To avoid any
rotational or axial movement of the Junk Bonnet during the down-hole operation
a shear screw is set in the PBR. Fluid enters through a port in the metal cup
to equalize potential internal/external differential pressure affecting the PBR.