Wellhead seals
In the oil and gas industry, the risk and consequence of unplanned downtime is greatest in extreme environments. SKF understands the demands, you face very day and offers an extended range of thoroughly tested and qualified wellhead seal products that will reliably meet your business and technical challenges.
You can trust our FS- and S-seals as well as our T- and Locking T-seals to perform in the most challenging conditions, as they’ve all been through the most rigorous testing program at our own cutting-edge testing facilities.
Putting them through extreme examinations means SKF seals meet the highest standards of performance. If you are concerned about critical failure or the cost and impact of downtime, this is a solution that offers confidence and reliability.
- Materials tested per API 6A annex F1.13.5.2 and NORSOK M710 rev 2
- Seals tested per API 6A annex F PR2 F 1.11
- Manufacturing process verified to highest level of repeatable product quality
- Fast turnaround and trouble shooting
FS-seals
Handling the heat and the pressure
The FS-seal is a relatively large cross section spring energized rubber casing and tubing hanger seal for wellheads that always has the springs on the internal surface.
FS-seals are used against rough surface finish and wider dimensional and geometrical tolerances of casing and tubing.
Sealing materials utilized for wellheads need to withstand pressures as high as 1 034 bar (15 000 psi) and temperatures of 149º C (300º F).
All our FS-seals successfully passed the test according to API 6A annex F PR2 with the following parameters:
- Gas test pressure: 0 to 690 bar (0 to 10 000 psi)
- Temperature: -18 to 121 °C (0 to 250 °F)
- Test medium: Nitrogen gas
S-seals
Handling the heat and the pressure
Your wellhead is a critical part of oil and gas infrastructure. Its sealing materials need to withstand pressures as high as 1 034 bar (15 000 psi) and temperatures of 149º C (300º F).
From design through to production, SKF S-seals are made to perform in the toughest situations, delivering reliable high-pressure static sealing.
All our wellhead seals of the FS range successfully passed the test without any seals damage according to API 6A annex F PR2 with the following parameters:
- Gas test pressure: 0 to 690 bar (0 to 10 000 psi)
- Temperature: -18 to 121 °C (0 to 250 °F)
- Test medium: Nitrogen gas
FS-seals
Well proven products and problem solvers
The T-seal is a proven design with a long history of service. All T-seals are three piece seals with an elastomeric lip and hard plastic anti-extrusion rings. The standard design will fit into an o-ring gland and can be machined or net moulded.
SKF produces customizable T-seals from a variety of materials to meet almost any gland size.
T-seals
The standard T-seal is a common seal design used in many different industries. The oil and gas market often has a high mix of products and low volumes. The ability to machine the T-seal from a variety of materials makes the SKF manufacturing methods an attractive option.
T-seals are manufactured by machining or moulding made of different HNBR or FKM-types as sealing material and a backup ring made of PEEK.
For more details about materials refer to the page Sealing materials for oil and gas.
For details about the wellhead seal selection criteria refer to Seal selection criteria.
Locking T-seals
The Locking T-seal is an SKF patented design where a ridge on the hard plastic anti-extrusion ring is able to snap into a groove moulded or machined into the elastomer lip, locking the T-seals’ anti-extrusion ring in the right position.
One cause of failure for T-seals is damage to the anti-extrusion ring during installation. As well as enabling easier installation, the unique design reduces the risk of damage to the seal or other wellhead components by preventing the anti-extrusion ring from opening during installation.
This design is suitable for applications, where where assembly may be challenging or where the backup ring position cannot visually be inspected, such as blind or remote installations.
The Locking T-seal can be used in dynamic reciprocating seal functions as well as high pressure static connections.
The Locking T-seal as been successfully used in fluid power applications as well as downhole tool conditions, where the part in engaged and disengaged during use. It has also been used to replace S-seals in smaller diameter parts due to the potential of the S-seal springs coming unbonded during the stretching of the seal into place.
The SKF Locking T-seal brings together the most practical and reliable elements of T-seals and spring backup seals in one innovative solution that perfectly meets the demands of oil and gas exploration.
Locking T-seals are manufactured by moulding made of SKF Ecorubber-H 85A-b-ED or (HNBR) or SKF Ecorubber-2 85A-b-ED-TP (FKM) as sealing material and a backup ring made of SKF Ecopaek.
For more details about materials refer to the page Sealing materials for oil and gas.
For details about the wellhead seal selection criteria refer to Seal selection criteria.