The deepwater and ultra-deepwater application of heavier parent casing weight liners creates a two-fold challenge.
The first is dealing with the heavier parent weight, and the second is setting hangers at elevated temperatures. The combined challenge was more than standard liner hangers, which typically rely on all-elastomer seals, could handle. This forced reliance on a modified standard liner hanger system that required the cement job to provide overall sealing capability.
Halliburton
