The Pack off Nipple
is located between the Liner Hanger and the Liner Top Packer. Its functional
task is to provide housing for the retrievable and drillable inner sealing
element (Pack off Bushing) and to ensure an optimal sealing.
For the retrievable
variant, a locking profile for the Pack off Bushing and a high surface finish
for the seal are integrated in the Pack off Nipple. For the (PDC) drillable
variant a special Pack off Bushing was designed, which is able to be installed
directly in the Pack off Nipple with anti rotating features.