Sealing or Resealing of Casing-in-Casing

Seals of casing within casing can leak over time. This can be an internal casing patch which has been installed to mitigate a primary casing leak, or a casing seal such as that used in Steam Assisted Gravity Draining (SAGD) operations in the form of a casing top packer. Controlled CET can be used to reseal a casing patch or provide a more secure primary seal for a casing top packer.