Perforating Through Casing Strings To Remediate Annulus Gas Leak

摘要

ADMA-OPCO had integrity problems in one of its gas wells, and abandonment was the only option available to restore the integrity of the offshore multiwell jacket and revive adjacent wells. Integrity problems included oil/gas bubbles observed on the seabed around the conductor pipe and high sustained pressures in the outer cemented casing annuli. Because the leak was determined to be located outside the casing, the perforation of several intervals was required. Some of the intervals were perforated through three casing strings, and the rest through four strings of casing, before being squeeze cemented.