Enhance casing integrity even with extended well depths

The metal-to-metal, gas-tight liner tieback connects liners to a tieback string of casing with a permanent seal capable of withstanding high axial loads. The unique metal-to-metal sealing and anchoring technology shapes metal downhole to create metal-to-metal solutions that conform perfectly to the shape of the casing string.

To reach setting depths of 30,000 ft [9,144 m] or more, operators are increasing the number of casing strings in their well designs. Tighter annular clearances require the use of more flush joint connections. Conventional liner hanger equipment is unable to match the ratings of the casing in these well designs, especially when the liner must be tied back to surface. In contrast, our liner tieback system lets you run a conventional hanger system and tie the liner string back to the wellhead without sacrificing casing integrity or rating.

Tackle challenging hole conditions

When a long casing string must be run into a challenging wellbore, the inability to rotate and circulate quickly may result in the casing not reaching total depth (TD) and having to be pulled for a wiper trip. To avoid this eventuality, the lower section of the casing string can be run as a liner with a heavy-duty running tool enabling push, pull, rotation, and circulation capability. This method has the added benefit of reducing the equivalent circulating density (ECD). The system has no moving parts, gauge rings, elements, or slips, which is ideal when dealing with poor hole conditions.

After the liner is cemented in place and the running tools are removed from the well, the metal-to-metal stinger and tieback casing are run, spaced out, and hung in the wellhead. The stinger is then expanded into the liner tieback receptacle, creating a continuous metal-to-metal casing string from surface to TD. The operator is able to space out the tieback into the wellhead in a controlled environment.

Running the liner tieback system in the liner hanger assembly provides you with full ISO 14310 V0-rated downhole casing connection integrity. This method is ideally suited for offshore wells where limited slots necessitate that the casing reach TD every time.

• Extended-reach drilling
• Wells with architecture or conditions that make it challenging to run long casing strings

• Enhances well integrity by enabling the permanent connection of a liner to a tieback string of casing, using a durable metal-to-metal seal
• Eliminates the risks of conventional elastomeric seals
• Provides flexibility in casing and liner space out

Deploy under various operating conditions

• ISO 14310 V0 rated
• High axial-load-bearing capability
• Ability to be run with or without conventional liner hanger equipment
• NACE compatibility