First 7-5/8 in. HP SET Openhole Liner in Deepwater GOM

Summary:

An operator drilling a sub-salt exploration deepwater well in Gulf of Mexico, experienced an unstable wellbore at the base of the salt; which resulted in setting the 9-7/8 in. liner 3,400 ft higher than originally planned.
In exploratory wells, maintaining hole size is critical due to deeper uncertainties, such as unknown pressure regimes. For this reason, the operator needed a solution that would preserve hole size while providing greater collapse properties than standard SET systems.
 

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Overview
Document Type
Case History
Date Published
Tuesday, March 13, 2012
Region
North America, USA, GOM

Additional Document Information

Environment:
Deep-water
System Plan:
Contingency
System Type:
OHL
Values Added:
Enable planned completion, Maximize ID and TD, Evaluation enhancement, Reach planned TD
Casing Size:
9 7/8"
Expandable Size:
7 5/8"
Liner Length:
1001-2000'