Secondary Seal Assemblies come in many forms and are installed in the lower seal area of the casing spool or tubing head. They are utilized to offer redundant well security between the casing annulus and the flanged connection of a casing head, casing spool or tubing head. In certain instances these seals can offer a special sealing capability for FRAC equipment. Secondary seal assemblies include several advanced elastomeric and metal to metal seal designs.
- Packoffs or Secondary seals come in many different configurations and pressure ratings
- Secondary seals assemblies seal on rough casing
- Some provide an elastomeric seal
- Some provide a metal to metal seal
- Secondary seals, or packoffs, come in many different I.D. sizes allowing for a broad range of casing sizes to be utilized in a standard bottom prep in the casing spool or tubing head
Reducer Bushing Components
2-CS Reducer Bushings
Yancheng Cyber’s 2-CS Reducer bushing is the simplest of the secondary seal assemblies. It consists of reducer bushing body, (2) CS Seals in the I.D. of the bushing and a snap ring for retaining the bushing in the secondary seal area of a casing spool or tubing head.
- This design consists of two ”CS”seals located in grooves in the I.D. of the reducer bushing body
- A seal is achieved by interference of the seal with the outside diameter of the casing and the I.D. of the seal groove
- A spring molded in each ID corner of the seal provides theanti‑extrusion mechanism when sealing against the casing OD
- The shape of the seal allows it flexibility to maintain interference with normal manufactured tolerances of the casing O.D.
- Is utilized in the bottom of a casing spool or tubing head that already has (2) ”CS”seals in the secondary seal area
Type | Size | Casing Size | WP | PSL Levels | Material Classes |
2-CS | 7″ | 3-1/2” thru 5-1/2″ | 3K, 5K, 10K | PSL 1 thru 3 | AA, EE, FF |
2-CS | 9″ | 4-1/2″ thru 7-5/8″ | 3K, 5K, 10K | PSL 1 thru 3 | AA, EE, FF |
2-CS | 9-3/4” | 4-1/2” thru 7” | 3K, 5K, 10K | PSL 1 thru 3 | AA, EE, FF |
2-CS | 12-1/2” | 9-5/8” | 3K, 5K, 10K | PSL 1 thru 3 | AA, EE, FF |
4S-FS Reducer Bushings
Yancheng Cyber’s 4S-CS Seal Assembly is a secondary seal assembly that features both O.D. and I.D. seals. It consists of reducer bushing body, (2) CS Seals in the I.D. of the bushing accompanied by (2) S-Seals on the O.D. A single snap ring also retains the bushing in the secondary seal area of a casing spool or tubing head.
- This design consists of two ”CS”seals located in the I.D. of the reducer bushing body and (2) ”S” seals located on the O.D.
- A seal is achieved by interference of the seals on both the I.D. and O.D. of the seal assembly
- A spring molded in each ID corner of the seal provides theanti‑extrusion mechanism when sealing against the casing OD or the secondary seal area in the casing spool or tubing head
- The shape of the seal allows it flexibility to maintain
interference with normal manufactured tolerances of the casing O.D.
- Is utilized in the bottom of a casing spool or tubing head that already has no seals in the secondary seal area
Type | Size | Casing Size | WP | PSL Levels | Material Class |
4S-CS | 7″ | 4-1/2” thru 5-1/2″ | 3K, 5K, 10K | PSL 1 thru 3 | AA, EE, FF |
4S-CS | 9″ | 4-1/2″ thru 7-5/8″ | 3K, 5K, 10K | PSL 1 thru 3 | AA, EE, FF |
4S-CS | 9-3/4” | 4-1/2” thru 7” | 3K, 5K, 10K | PSL 1 thru 3 | AA, EE, FF |
4S-CS | 12-1/2” | 9-5/8” | 3K, 5K, 10K | PSL 1 thru 3 | AA, EE, FF |
BG-PE Seal Assembly
The BG-PE Seal is a secondary seal of different design. It is a five piece assembly consisting of an upper and lower junk ring, a seal element, a non-extrusion ring and a snap ring to retain the assembly in the secondary seal area of a casing spool or tubing head.
- The upper junk ring serves as a bit guide, (BG)
- In this design the seal element is pressure energized, (PE)
- Utilizes a single molded seal element to affect a annular seal
- Is extremely robust and will still offer a solid, positive seal even if the sealing areas of the element have been damaged and/or sections of the seal element are missing
- Is used in application up to 10,000 PSI
Type | Size | Casing Size | WP | PSL Levels | Material Class |
BG-PE | 9″ | 4-1/2″ thru 7-5/8″ | 3K, 5K, 10K | PSL 1 thru 3 | AA, EE, FF |
BG-PE | 9-3/4” | 4-1/2” thru 7-5/8” | 3K, 5K, 10K | PSL 1 thru 3 | AA, EE, FF |
BG-PE | 10-3/4” | 4-1/2” thru 9-5/8” | 3K, 5K, 10K | PSL 1 thru 3 | AA, EE, FF |
BG-PE | 12-1/2” | 7” thru 10-3/4” | 3K, 5K, 10K | PSL 1 thru 3 | AA, EE, FF |
Mandrel Hanger Pack-offs
This style of secondary seal is designed to be used in conjunction with a mandrel-type casing hanger. They can be installed through the BOP stack over the neck of the mandrel hanger thus sealing off the casing annulus.
Like the mandrel hanger itself, these pack-offs are engineered to meet the unique requirements of your well design.
l Pack-off /Support Bushing