ZXPN liner top packer
The ZXP-N™ is a compression-set liner top packer that uses a modified ZX packing element design to ensure an effective liner top seal. The expanding metal seal element is molded with a bonded nitrile (HNBR) elastomer for a high-pressure rating and for high-circulation rates at moderate temperatures.
The annealed steel and elastomer ZX element is actuated by applying set-down weight to the tieback extension through the setting dogs on the liner running tool. This force drives the ZX seal up a ramp, causing it to expand and conform to the casing’s inside diameter (ID). The element’s external ribs seal off any extrusion gap, trapping the setting force and preventing elastomer flow. A body-lock ring system incorporated in the ZX seal holds a permanent set in the seal after it is actuated. The ZXP-N liner top packer is typically run as an integral component of the primary liner hookup and is compression-set using a packer-setting dog sub or a hydraulic pusher tool.
- Expanding metal seal element with a bonded nitrile (HNBR) elastomeric cover ensures seal integrity at moderate temperatures
- Bonded ZX seal prevents swab-off and allows for higher circulation rates