Based on the ZXP liner top packer, the ZXtreme liner top packer uses an expandable metal seal body with a bonded elastomer seal and a robust FLEX-LOCK-style hold-down system. It uses operational pressure to “boost” the seal from above or below, ensuring that it will perform without requiring excessive set-down weight. For installation, the ZXtreme is rotationally locked to prevent component back-offs in the event that the liner is rotated while being lowered to the appropriate setting depth. The bonded elastomer seal element prevents swab-off at high run-in speeds or high circulation rates. The ZXtreme liner top packer is actuated by applying set-down weight to the tieback extension using a packer-setting dog sub or hydraulic-setting tool; a body lock ring system then holds a permanent set in the packer once it is actuated. The liner top packer ensures an adequate gas-tight seal while remaining anchored in the casing under extreme pressures and temperatures.

Advantages of the ZXtreme liner top packer include:

• Tested beyond industry standards 15,000 psi (1,034 bar) ISO 14310 V0-rated “Cold Set” ISO 14310 V0 for HP/LT (low temperature) applications
• Tested beyond API 11D1 V0 to accommodate high and low temperature settings
• Elastomeric seal bonded to expandable metal seal body prevents element swab-off at high run-in speeds and high circulation rates
• Seal element will “boost” from above or below
• Extremely robust hold-down system using
• Flex-Lock hanger technology
• Can transmit torque for liner rotation operations required to get to setting depth
• Rotationally locked to prevent component back-off