Analysis of Factors Contributing to Long Term Shallow Gas Migration to Seabed in Surface Casing Annulus
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A common observation is a low rate gas bubbling from the outside of the 20” surface casing on wells located in the Haltenbanken area on Norwegian Continental Shore. This phenomenon is known as long term shallow gas migration in surface casing annulus. In this thesis it is demonstrated that cement radial shrinkage is a major factor contributing to long term annular gas migration. This is done by performing an analysis of data obtained from leak tests conducted in laboratory and case study of the wells located on Norwegian Continental Shelf that has experienced shallow gas migration.
Master's thesis in Petroleum engineering