The Tie Back Stem is
used when a tie back is required. Typical tie back situations result from
defective casing strings and provide a new workable casing string. The Tie Back Stem is
stabbed into an existing PBR in a second trip after a milling set has cleaned
up the top PBR. To ensure high seal integrity the Seal Stem is equipped with
seal assemblies consisting of special Molyglass
chevron rings and a central o-ring. The seal assembly
material can be changed to meet all reservoir demands. Atthe end of the Seal Stem a half mule shoe is
installed to support the stab in operation.
In addition, the Seal
Stem can be provided with a shearable
guide ring to centralize the Seal Stem while running down the hole and to
locate the Seal Stem, or rather the seal assemblies, while stabbing into the PBR.